WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 12/26/2003

Class	Cusip	Orig Prin Bal	Begin Prin Bal	Int Rate Accrued	Int Rate Paid	Int Dist	Prin Dist	Int Shortfall	Prin Loss	Deferred Interest	Int Reimbursed	Unscheduled Int	Prin Reimbursed	Subsequent Recoveries	Total Dist	Ending Class Bal
IA	9292276V3	$51,519,000.00	$48,373,550.45	4.5000000000%	4.5000000000%	$181,400.81	$212,954.25	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$394,355.06	$48,160,596.20
IIA1	9292276W1	$99,000,000.00	$85,500,913.36	5.0000000000%	5.0000000000%	$356,253.81	$647,968.04	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,004,221.84	$84,852,945.32
IIA2	9292276X9	$70,000,000.00	$60,455,191.27	4.5000000000%	4.5000000000%	$226,706.97	$458,159.22	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$684,866.19	$59,997,032.05
IIA3	9292276Y7	$273,871,000.00	$236,527,481.22	4.7500000000%	4.7500000000%	$936,254.61	$1,792,521.76	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$2,728,776.38	$234,734,959.46
IIA4	9292276Z4	$37,822,000.00	$32,664,803.48	1.5250000000%	1.5250000000%	$41,511.52	$247,549.97	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$289,061.49	$32,417,253.51
IIA5	9292277A8	$37,822,000.00	$32,664,803.48	6.4750000000%	6.4750000000%	$176,253.84	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$176,253.84	$32,417,253.51
IIA6	9292277B6	$50,000,000.00	$43,182,279.47	3.4400000000%	3.4400000000%	$123,789.20	$327,256.59	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$451,045.79	$42,855,022.88
IIA7	9292277C4	$15,600,000.00	$13,472,871.19	5.0000000000%	5.0000000000%	$56,136.96	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$56,136.96	$13,370,767.14
IIA8	9292277D2	$41,667,000.00	$35,985,520.78	1.5250000000%	1.5250000000%	$45,731.60	$272,716.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$318,447.60	$35,712,804.78
IIA9	9292277E0	$41,667,000.00	$35,985,520.78	0.0500000000%	0.0500000000%	$1,499.40	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,499.40	$35,712,804.78
IIA10	9292277F7	$25,000,000.00	$21,591,139.73	10.7083333263%	10.7083333263%	$192,670.93	$163,628.29	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$356,299.23	$21,427,511.44
IIA11	9292277G5	$10,000,000.00	$8,636,455.90	4.0000000000%	4.0000000000%	$28,788.19	$65,451.32	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$94,239.50	$8,571,004.58
IX	9292277H3	$2,195,579.00	$1,828,566.64	4.5000000000%	4.5000000000%	$6,857.12	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$6,857.12	$1,820,823.20
IIX	9292277J9	$19,037,622.00	$15,389,872.58	5.0000000000%	5.0000000000%	$64,124.47	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$64,124.47	$15,253,581.73
IP	9292277K6	$15,160.00	$12,039.34	0.0000000000%	0.0000000000%	$0.00	$71.45	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$71.45	$11,967.89
IIP	9292277L4	$1,197,485.00	$1,153,571.07	0.0000000000%	0.0000000000%	$0.00	$5,092.71	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$5,092.71	$1,148,478.36
CB1	9292277M2	$4,007,000.00	$3,932,409.93	4.9609907316%	4.9609907316%	$16,257.21	$15,188.39	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$31,445.60	$3,917,221.54
CB2	9292277N0	$1,001,000.00	$982,366.45	4.9609907316%	4.9609907316%	$4,061.26	$3,794.25	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$7,855.51	$978,572.20
CB3	9292277P5	$1,335,000.00	$1,310,149.06	4.9609907316%	4.9609907316%	$5,416.36	$5,060.27	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$10,476.63	$1,305,088.79
CB4	9292276S0	$667,000.00	$654,583.83	4.9609907316%	4.9609907316%	$2,706.15	$2,528.24	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$5,234.39	$652,055.59
CB5	9292276T8	$333,000.00	$326,801.23	4.9609907316%	4.9609907316%	$1,351.05	$1,262.22	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$2,613.27	$325,539.01
CB6	9292276U5	$674,798.72	$662,237.33	4.9609907316%	4.9609907316%	$2,737.79	$2,557.80	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$5,295.59	$659,679.53
R	9292277Q3	$100.00	$0.00	0.0000000000%	0.0000000000%	$2.03	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$2.03	$0.00
R_SYN	XXXXXXXXX	$0.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
Total		$668,109,543.72	$581,951,493.90			$2,470,511.29	$4,223,760.78	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$6,694,272.07	$577,727,733.12

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 12/26/2003

Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IA	$51,519,000.00	$48,373,550.45	$0.00	$0.00	$0.00	$0.00	$212,954.25	0.9348123255	$48,160,596.20
IIA1	$99,000,000.00	$85,500,913.36	$0.00	$0.00	$0.00	$0.00	$647,968.04	0.8571004578	$84,852,945.32
IIA2	$70,000,000.00	$60,455,191.27	$0.00	$0.00	$0.00	$0.00	$458,159.22	0.8571004579	$59,997,032.05
IIA3	$273,871,000.00	$236,527,481.22	$0.00	$0.00	$0.00	$0.00	$1,792,521.76	0.8571004577	$234,734,959.46
IIA4	$37,822,000.00	$32,664,803.48	$0.00	$0.00	$0.00	$0.00	$247,549.97	0.8571004577	$32,417,253.51
IIA5	$37,822,000.00	$32,664,803.48	$0.00	$0.00	$0.00	$0.00	$0.00	0.8571004577	$32,417,253.51
IIA6	$50,000,000.00	$43,182,279.47	$0.00	$0.00	$0.00	$0.00	$327,256.59	0.8571004576	$42,855,022.88
IIA7	$15,600,000.00	$13,472,871.19	$0.00	$0.00	$0.00	$0.00	$0.00	0.8571004577	$13,370,767.14
IIA8	$41,667,000.00	$35,985,520.78	$0.00	$0.00	$0.00	$0.00	$272,716.00	0.8571004579	$35,712,804.78
IIA9	$41,667,000.00	$35,985,520.78	$0.00	$0.00	$0.00	$0.00	$0.00	0.8571004579	$35,712,804.78
IIA10	$25,000,000.00	$21,591,139.73	$0.00	$0.00	$0.00	$0.00	$163,628.29	0.8571004576	$21,427,511.44
IIA11	$10,000,000.00	$8,636,455.90	$0.00	$0.00	$0.00	$0.00	$65,451.32	0.8571004580	$8,571,004.58
IX	$2,195,579.00	$1,828,566.64	$0.00	$0.00	$0.00	$0.00	$0.00	0.8293134522	$1,820,823.20
IIX	$19,037,622.00	$15,389,872.58	$0.00	$0.00	$0.00	$0.00	$0.00	0.8012335643	$15,253,581.73
IP	$15,160.00	$12,039.34	$0.00	$0.00	$0.00	$0.00	$71.45	0.7894386544	$11,967.89
IIP	$1,197,485.00	$1,153,571.07	$0.00	$0.00	$0.00	$0.00	$5,092.71	0.9590753621	$1,148,478.36
CB1	$4,007,000.00	$3,932,409.93	$0.00	$0.00	$0.00	$0.00	$15,188.39	0.9775945945	$3,917,221.54
CB2	$1,001,000.00	$982,366.45	$0.00	$0.00	$0.00	$0.00	$3,794.25	0.9775946054	$978,572.20
CB3	$1,335,000.00	$1,310,149.06	$0.00	$0.00	$0.00	$0.00	$5,060.27	0.9775945993	$1,305,088.79
CB4	$667,000.00	$654,583.83	$0.00	$0.00	$0.00	$0.00	$2,528.24	0.9775945877	$652,055.59
CB5	$333,000.00	$326,801.23	$0.00	$0.00	$0.00	$0.00	$1,262.22	0.9775946246	$325,539.01
CB6	$674,798.72	$662,237.33	$0.00	$0.00	$0.00	$0.00	$2,557.80	0.9775945189	$659,679.53
R	$100.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
R_SYN	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
Total	$668,109,543.72	$581,951,493.90	$0.00	$0.00	$0.00	$0.00	$4,223,760.78	0.8647200726	$577,727,733.12

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 12/26/2003
PER $1000 DENOMINATION
Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IA	$51,519,000.00	938.94583455	0.00000000	0.00000000	0.00000000	0.00000000	4.13350900	0.9348123255	934.81232555
IIA1	$99,000,000.00	863.64558949	0.00000000	0.00000000	0.00000000	0.00000000	6.54513172	0.8571004578	857.10045778
IIA2	$70,000,000.00	863.64558957	0.00000000	0.00000000	0.00000000	0.00000000	6.54513171	0.8571004579	857.10045786
IIA3	$273,871,000.00	863.64558942	0.00000000	0.00000000	0.00000000	0.00000000	6.54513169	0.8571004577	857.10045773
IIA4	$37,822,000.00	863.64558934	0.00000000	0.00000000	0.00000000	0.00000000	6.54513167	0.8571004577	857.10045767
IIA5	$37,822,000.00	863.64558934	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.8571004577	857.10045767
IIA6	$50,000,000.00	863.64558940	0.00000000	0.00000000	0.00000000	0.00000000	6.54513180	0.8571004576	857.10045760
IIA7	$15,600,000.00	863.64558910	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.8571004577	857.10045769
IIA8	$41,667,000.00	863.64558956	0.00000000	0.00000000	0.00000000	0.00000000	6.54513164	0.8571004579	857.10045792
IIA9	$41,667,000.00	863.64558956	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.8571004579	857.10045792
IIA10	$25,000,000.00	863.64558920	0.00000000	0.00000000	0.00000000	0.00000000	6.54513160	0.8571004576	857.10045760
IIA11	$10,000,000.00	863.64559000	0.00000000	0.00000000	0.00000000	0.00000000	6.54513200	0.8571004580	857.10045800
IX	$2,195,579.00	832.84028495	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.8293134522	829.31345217
IIX	$19,037,622.00	808.39259126	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.8012335643	801.23356426
IP	$15,160.00	794.15171504	0.00000000	0.00000000	0.00000000	0.00000000	4.71306069	0.7894386544	789.43865435
IIP	$1,197,485.00	963.32820035	0.00000000	0.00000000	0.00000000	0.00000000	4.25283824	0.9590753621	959.07536211
CB1	$4,007,000.00	981.38505865	0.00000000	0.00000000	0.00000000	0.00000000	3.79046419	0.9775945945	977.59459446
CB2	$1,001,000.00	981.38506494	0.00000000	0.00000000	0.00000000	0.00000000	3.79045954	0.9775946054	977.59460539
CB3	$1,335,000.00	981.38506367	0.00000000	0.00000000	0.00000000	0.00000000	3.79046442	0.9775945993	977.59459925
CB4	$667,000.00	981.38505247	0.00000000	0.00000000	0.00000000	0.00000000	3.79046477	0.9775945877	977.59458771
CB5	$333,000.00	981.38507508	0.00000000	0.00000000	0.00000000	0.00000000	3.79045045	0.9775946246	977.59462462
CB6	$674,798.72	981.38498247	0.00000000	0.00000000	0.00000000	0.00000000	3.79046362	0.9775945189	977.59451885
R	$100.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
R_SYN	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 12/26/2003

Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
IA	$51,519,000.00	4.5000000000%	4.5000000000%	$48,373,550.45	$181,400.81	$0.00	$0.00	$0.00	$181,400.81
IIA1	$99,000,000.00	5.0000000000%	5.0000000000%	$85,500,913.36	$356,253.81	$0.00	$0.00	$0.00	$356,253.81
IIA2	$70,000,000.00	4.5000000000%	4.5000000000%	$60,455,191.27	$226,706.97	$0.00	$0.00	$0.00	$226,706.97
IIA3	$273,871,000.00	4.7500000000%	4.7500000000%	$236,527,481.22	$936,254.61	$0.00	$0.00	$0.00	$936,254.61
IIA4	$37,822,000.00	1.5250000000%	1.5250000000%	$32,664,803.48	$41,511.52	$0.00	$0.00	$0.00	$41,511.52
IIA5	$37,822,000.00	6.4750000000%	6.4750000000%	$32,664,803.48	$176,253.84	$0.00	$0.00	$0.00	$176,253.84
IIA6	$50,000,000.00	3.4400000000%	3.4400000000%	$43,182,279.47	$123,789.20	$0.00	$0.00	$0.00	$123,789.20
IIA7	$15,600,000.00	5.0000000000%	5.0000000000%	$13,472,871.19	$56,136.96	$0.00	$0.00	$0.00	$56,136.96
IIA8	$41,667,000.00	1.5250000000%	1.5250000000%	$35,985,520.78	$45,731.60	$0.00	$0.00	$0.00	$45,731.60
IIA9	$41,667,000.00	0.0500000000%	0.0500000000%	$35,985,520.78	$1,499.40	$0.00	$0.00	$0.00	$1,499.40
IIA10	$25,000,000.00	10.7083333263%	10.7083333263%	$21,591,139.73	$192,670.93	$0.00	$0.00	$0.00	$192,670.93
IIA11	$10,000,000.00	4.0000000000%	4.0000000000%	$8,636,455.90	$28,788.19	$0.00	$0.00	$0.00	$28,788.19
IX	$2,195,579.00	4.5000000000%	4.5000000000%	$1,828,566.64	$6,857.12	$0.00	$0.00	$0.00	$6,857.12
IIX	$19,037,622.00	5.0000000000%	5.0000000000%	$15,389,872.58	$64,124.47	$0.00	$0.00	$0.00	$64,124.47
IP	$15,160.00	0.0000000000%	0.0000000000%	$12,039.34	$0.00	$0.00	$0.00	$0.00	$0.00
IIP	$1,197,485.00	0.0000000000%	0.0000000000%	$1,153,571.07	$0.00	$0.00	$0.00	$0.00	$0.00
CB1	$4,007,000.00	4.9609907316%	4.9609907316%	$3,932,409.93	$16,257.21	$0.00	$0.00	$0.00	$16,257.21
CB2	$1,001,000.00	4.9609907316%	4.9609907316%	$982,366.45	$4,061.26	$0.00	$0.00	$0.00	$4,061.26
CB3	$1,335,000.00	4.9609907316%	4.9609907316%	$1,310,149.06	$5,416.36	$0.00	$0.00	$0.00	$5,416.36
CB4	$667,000.00	4.9609907316%	4.9609907316%	$654,583.83	$2,706.15	$0.00	$0.00	$0.00	$2,706.15
CB5	$333,000.00	4.9609907316%	4.9609907316%	$326,801.23	$1,351.05	$0.00	$0.00	$0.00	$1,351.05
CB6	$674,798.72	4.9609907316%	4.9609907316%	$662,237.33	$2,737.79	$0.00	$0.00	$0.00	$2,737.79
R	$100.00	0.0000000000%	0.0000000000%	$0.00	$2.03	$0.00	$0.00	$0.00	$2.03
R_SYN	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
Total	$668,109,543.72			$581,951,493.90	$2,470,511.29	$0.00	$0.00	$0.00	$2,470,511.29

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 12/26/2003
PER $1000 DENOMINATION
Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
IA	$51,519,000.00	4.5000000000%	4.5000000000%	938.94583455	3.52104680	0.00000000	0.00000000	0.00000000	3.52104680
IIA1	$99,000,000.00	5.0000000000%	5.0000000000%	863.64558949	3.59852333	0.00000000	0.00000000	0.00000000	3.59852333
IIA2	$70,000,000.00	4.5000000000%	4.5000000000%	863.64558957	3.23867100	0.00000000	0.00000000	0.00000000	3.23867100
IIA3	$273,871,000.00	4.7500000000%	4.7500000000%	863.64558942	3.41859711	0.00000000	0.00000000	0.00000000	3.41859711
IIA4	$37,822,000.00	1.5250000000%	1.5250000000%	863.64558934	1.09754957	0.00000000	0.00000000	0.00000000	1.09754957
IIA5	$37,822,000.00	6.4750000000%	6.4750000000%	863.64558934	4.66008778	0.00000000	0.00000000	0.00000000	4.66008778
IIA6	$50,000,000.00	3.4400000000%	3.4400000000%	863.64558940	2.47578400	0.00000000	0.00000000	0.00000000	2.47578400
IIA7	$15,600,000.00	5.0000000000%	5.0000000000%	863.64558910	3.59852308	0.00000000	0.00000000	0.00000000	3.59852308
IIA8	$41,667,000.00	1.5250000000%	1.5250000000%	863.64558956	1.09754962	0.00000000	0.00000000	0.00000000	1.09754962
IIA9	$41,667,000.00	0.0500000000%	0.0500000000%	863.64558956	0.03598531	0.00000000	0.00000000	0.00000000	0.03598531
IIA10	$25,000,000.00	10.7083333263%	10.7083333263%	863.64558920	7.70683720	0.00000000	0.00000000	0.00000000	7.70683720
IIA11	$10,000,000.00	4.0000000000%	4.0000000000%	863.64559000	2.87881900	0.00000000	0.00000000	0.00000000	2.87881900
IX	$2,195,579.00	4.5000000000%	4.5000000000%	832.84028495	3.12314884	0.00000000	0.00000000	0.00000000	3.12314884
IIX	$19,037,622.00	5.0000000000%	5.0000000000%	808.39259126	3.36830251	0.00000000	0.00000000	0.00000000	3.36830251
IP	$15,160.00	0.0000000000%	0.0000000000%	794.15171504	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIP	$1,197,485.00	0.0000000000%	0.0000000000%	963.32820035	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
CB1	$4,007,000.00	4.9609907316%	4.9609907316%	981.38505865	4.05720240	0.00000000	0.00000000	0.00000000	4.05720240
CB2	$1,001,000.00	4.9609907316%	4.9609907316%	981.38506494	4.05720280	0.00000000	0.00000000	0.00000000	4.05720280
CB3	$1,335,000.00	4.9609907316%	4.9609907316%	981.38506367	4.05719850	0.00000000	0.00000000	0.00000000	4.05719850
CB4	$667,000.00	4.9609907316%	4.9609907316%	981.38505247	4.05719640	0.00000000	0.00000000	0.00000000	4.05719640
CB5	$333,000.00	4.9609907316%	4.9609907316%	981.38507508	4.05720721	0.00000000	0.00000000	0.00000000	4.05720721
CB6	$674,798.72	4.9609907316%	4.9609907316%	981.38498247	4.05719501	0.00000000	0.00000000	0.00000000	4.05719501
R	$100.00	0.0000000000%	0.0000000000%	0.00000000	20.30000000	0.00000000	0.00000000	0.00000000	20.30000000
R_SYN	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WAMU 03S6
WEIGHTED AVERAGE PC RATE: 5.09426%
WEIGHTED AVERAGE MATURITY: 171.78023
WEIGHTED AVERAGE LOAN AGE: 6.92001
POOL NUMBER: Group 1(2136,2137)
ISSUE DATE: 06/24/2003
CERTIFICATE BALANCE AT ISSUE: $668,109,543.72
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	1209		$581,951,493.92
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$2,248,445.19
Unscheduled Principal Collection/Reversals		$311,981.42
Liquidations-in-full	4	$1,663,334.17
Subsequent Recoveries		$0.00
Net principal Distributed		$4,223,760.78	-$4,223,760.78

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	1205		$577,727,733.14

SCHEDULED INTEREST AT MORTGAGE RATE:		$2,591,751.35

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$121,240.06

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$6,694,272.07

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WAMU 03S6
WEIGHTED AVERAGE PC RATE: 4.66683%
WEIGHTED AVERAGE MATURITY: 171.52991
WEIGHTED AVERAGE LOAN AGE: 6.92800
POOL NUMBER: 2136
ISSUE DATE: 06/24/2003
CERTIFICATE BALANCE AT ISSUE: $52,160,134.72
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	103		$48,999,482.38
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$196,501.68
Unscheduled Principal Collection/Reversals		$18,985.61
Liquidations-in-full	0	$0.00
Subsequent Recoveries		$0.00
Net principal Distributed		$215,487.29	-$215,487.29

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	103		$48,783,995.09

SCHEDULED INTEREST AT MORTGAGE RATE:		$200,768.27

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$10,208.22

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$406,047.34

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WAMU 03S6
WEIGHTED AVERAGE PC RATE: 5.13356%
WEIGHTED AVERAGE MATURITY: 171.80332
WEIGHTED AVERAGE LOAN AGE: 6.91928
POOL NUMBER: 2137
ISSUE DATE: 06/24/2003
CERTIFICATE BALANCE AT ISSUE: $615,949,409.00
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	1106		$532,952,011.54
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$2,051,943.51
Unscheduled Principal Collection/Reversals		$292,995.81
Liquidations-in-full	4	$1,663,334.17
Subsequent Recoveries		$0.00
Net principal Distributed		$4,008,273.49	-$4,008,273.49

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	1102		$528,943,738.05

SCHEDULED INTEREST AT MORTGAGE RATE:		$2,390,983.08

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$111,031.84

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$6,288,224.73

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WAMU 03S6
WEIGHTED AVERAGE PC RATE: 5.09426%
WEIGHTED AVERAGE MATURITY: 171.78023
WEIGHTED AVERAGE LOAN AGE: 6.92001
POOL NUMBER: ALL
ISSUE DATE: 06/24/2003
CERTIFICATE BALANCE AT ISSUE: $668,109,543.72
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	1209		$581,951,493.92
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$2,248,445.19
Unscheduled Principal Collection/Reversals		$311,981.42
Liquidations-in-full	4	$1,663,334.17
Subsequent Recoveries		$0.00
Net principal Distributed		$4,223,760.78	-$4,223,760.78

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	1205		$577,727,733.14

SCHEDULED INTEREST AT MORTGAGE RATE:		$2,591,751.35

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$121,240.06

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$6,694,272.07

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 12/26/2003

Distribution by Group
Pool ID		Principal		Interest		Total
Group 1(2136,2137)		$4,223,760.78		$2,470,511.29		$6,694,272.07
Pool - 2136		$215,487.29		$190,560.05		$406,047.34
Pool - 2137		$4,008,273.49		$2,279,951.24		$6,288,224.73
Aggregate		$4,223,760.78		$2,470,511.29		$6,694,272.07

Number of Loans and Aggregate Principal Balance By Group
Pool ID	Beg Bal	Beg Count	Paid Off / Liq Count	Rem Count	Sched Prin End Bal	Sched Prin	Prin PrePay / Liq	Unsched Prin / Rev	Total Prin
Group 1(2136,2137)	$581,951,493.92	1209	4	1205	$577,727,733.14	$2,248,445.19	$1,663,334.17	$311,981.42	$4,223,760.78
Pool - 2136	$48,999,482.38	103	0	103	$48,783,995.09	$196,501.68	$0.00	$18,985.61	$215,487.29
Pool - 2137	$532,952,011.54	1106	4	1102	$528,943,738.05	$2,051,943.51	$1,663,334.17	$292,995.81	$4,008,273.49
Aggregate	$581,951,493.92	1209	4	1205	$577,727,733.14	$2,248,445.19	$1,663,334.17	$311,981.42	$4,223,760.78

Delinquency Information by Group
Pool ID	1 Month Count	Sched End Balance	2 Months Count	Sched End Balance	3 Months Count	Sched End Balance	4 Months Count	Sched End Balance
Group 1(2136,2137)	8	$4,255,725.26	0	$0.00	0	$0.00	0	$0.00
Pool - 2136	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Pool - 2137	8	$4,255,725.26	0	$0.00	0	$0.00	0	$0.00
Aggregate	8	$4,255,725.26	0	$0.00	0	$0.00	0	$0.00

Foreclosure and REO Information by Group
Pool ID		Foreclosure Count		Sched End Balance		REO Count		Sched End Balance
Group 1(2136,2137)		0		$0.00		0		$0.00
Pool - 2136		0		$0.00		0		$0.00
Pool - 2137		0		$0.00		0		$0.00
Aggregate		0		$0.00		0		$0.00

Aggregate Loss Amounts by Group
Pool ID			Count			Loss Amount
Group 1(2136,2137)			0			$0.00
Aggregate			0			$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 12/26/2003

INSURANCE RESERVES - Group 1(2136,2137)
Insurance Type	Original Balance	Claims In Progress	Claims Paid	Coverage Adjustments	Coverage Remaining
MPI	$0.00	$0.00	$0.00	$0.00	$0.00
Special Hazard	$6,681,095.00	$0.00	$0.00	$0.00	$6,681,095.00
Bankruptcy Bond
Single-Units	$100,000.00	$0.00	$0.00	$0.00	$100,000.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$6,681,095.00	$0.00	$0.00	$0.00	$6,681,095.00

INSURANCE RESERVES - Aggregate
Insurance Type	Original Balance	Claims In Progress	Claims Paid	Coverage Adjustments	Coverage Remaining
MPI	$0.00	$0.00	$0.00	$0.00	$0.00
Special Hazard	$6,681,095.00	$0.00	$0.00	$0.00	$6,681,095.00
Bankruptcy Bond
Single-Units	$100,000.00	$0.00	$0.00	$0.00	$100,000.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$6,681,095.00	$0.00	$0.00	$0.00	$6,681,095.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03S6
Distribution Date: 12/26/2003

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and II Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated June 20,2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and II Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I,and II Loans, subject to the conditions and limitations to payment specified thereunder.



The Class Principal Balances of each Class of the Class CB1,CB2,CB3,CB4,CB5,CB6 Certificatesimmediately after the principal and interest distribution on 200312 are as follows:

Class			Class Principal Balance
CB1			$3,917,221.54
CB2			$978,572.20
CB3			$1,305,088.79
CB4			$652,055.59
CB5			$325,539.01
CB6			$659,679.53
Total			$7,838,156.65
Capitalized items used but not defined herein have the meanings ascribed to them in the Prospectus Supplement.
The amount of the special hazard coverage, bankruptcy coverage, and fraud coverage, as of the above referenced distribution date, is $6,681,095.00, $100,000.00, $6,681,095.00 respectively, and such coverages are referred to in the table above under the column "Insurance Type" as "special hazard," "bankruptcy bond," and "mortgage repurchase," respectively. However, no policy of insurance exists for any such coverage, notwithstanding the reference to "insurance."

WASHINGTON MUTUAL MORT SEC CORP WAMU MO PA TH CE SE 03 S6 8-K