The St. Louis Cardinals had the highest on-base percentage by a team in 2012, with an on-base percentage of .338.

	TEAM	OBP	SEASON	G	W%	W	L	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	SLG	OPS
1	Cardinals	.338	2012	162	.543	88	74	5,622	765	1,526	290	37	159	732	533	53	1,192	91	37	6,326	2,367	486	69	49	45	135	.271	.421	.759
2	Yankees	.337	2012	162	.586	95	67	5,524	804	1,462	280	13	245	774	565	62	1,176	93	27	6,231	2,503	538	31	49	31	136	.265	.453	.790
3	Tigers	.335	2012	162	.543	88	74	5,476	726	1,467	279	39	163	698	511	57	1,103	59	23	6,119	2,313	481	36	39	46	156	.268	.422	.757
4	Rangers	.334	2012	162	.574	93	69	5,590	808	1,526	303	32	200	780	478	57	1,103	91	44	6,214	2,493	535	36	53	44	121	.273	.446	.780
5	Angels	.332	2012	162	.549	89	73	5,536	767	1,518	273	22	187	732	449	47	1,113	134	33	6,120	2,396	482	47	41	29	138	.274	.433	.764
6	Rockies	.330	2012	162	.395	64	98	5,577	758	1,526	306	52	166	716	450	36	1,213	100	40	6,176	2,434	524	74	39	34	132	.274	.436	.766
7	Diamondbacks	.328	2012	162	.500	81	81	5,462	734	1,416	307	33	165	710	539	41	1,266	93	51	6,148	2,284	505	61	45	47	108	.259	.418	.746
8	Giants	.327	2012	162	.580	94	68	5,558	718	1,495	287	57	103	675	483	29	1,097	118	39	6,200	2,205	447	69	61	44	114	.269	.397	.724
9	Brewers	.325	2012	162	.512	83	79	5,557	776	1,442	300	39	202	741	466	90	1,240	158	39	6,224	2,426	541	76	35	35	111	.259	.437	.762
10	Twins	.325	2012	162	.407	66	96	5,562	701	1,448	270	30	131	666	505	53	1,069	135	37	6,209	2,171	431	33	56	28	149	.260	.390	.715
11	Indians	.324	2012	162	.420	68	94	5,525	667	1,385	266	24	136	635	555	59	1,087	110	44	6,195	2,107	426	17	39	28	141	.251	.381	.705
12	Nationals	.322	2012	162	.605	98	64	5,615	731	1,468	301	25	194	688	479	41	1,325	105	35	6,221	2,401	520	50	36	43	110	.261	.428	.750
13	Braves	.320	2012	162	.580	94	68	5,425	700	1,341	263	30	149	660	567	34	1,289	101	32	6,125	2,111	442	53	46	37	108	.247	.389	.709
14	Padres	.319	2012	162	.469	76	86	5,422	651	1,339	272	43	121	610	539	54	1,238	155	46	6,112	2,060	436	63	34	36	100	.247	.380	.699
15	White Sox	.318	2012	162	.525	85	77	5,518	748	1,409	228	29	211	726	461	65	1,203	109	43	6,111	2,328	468	31	36	24	112	.255	.422	.740
16	Rays	.317	2012	162	.556	90	72	5,398	697	1,293	250	30	175	665	571	58	1,323	134	44	6,103	2,128	455	34	42	26	133	.240	.394	.711
17	Phillies	.317	2012	162	.500	81	81	5,544	684	1,414	271	28	158	659	454	63	1,094	116	23	6,172	2,215	457	72	39	41	114	.255	.400	.716
18	Dodgers	.317	2012	162	.531	86	76	5,438	637	1,369	269	23	116	607	481	52	1,156	104	44	6,091	2,032	408	82	38	49	139	.252	.374	.690
19	Royals	.317	2012	162	.444	72	90	5,636	676	1,492	295	37	131	643	404	42	1,032	132	38	6,149	2,254	463	26	41	35	130	.265	.400	.716
20	Mets	.316	2012	162	.457	74	88	5,450	650	1,357	286	21	139	625	503	42	1,250	79	38	6,089	2,102	446	64	30	43	118	.249	.386	.701
21	Reds	.315	2012	162	.599	97	65	5,477	669	1,377	296	30	172	636	481	47	1,266	87	27	6,115	2,249	498	73	37	54	100	.251	.411	.726
22	Red Sox	.315	2012	162	.426	69	93	5,604	734	1,459	339	16	165	695	428	45	1,197	97	31	6,166	2,325	520	34	55	27	105	.260	.415	.730
23	Orioles	.311	2012	162	.574	93	69	5,560	712	1,375	270	16	214	677	480	50	1,315	58	29	6,158	2,319	500	38	30	24	152	.247	.417	.728
24	Athletics	.310	2012	162	.580	94	68	5,527	713	1,315	267	32	195	676	550	45	1,387	122	32	6,183	2,231	494	27	34	29	97	.238	.404	.714
25	Blue Jays	.309	2012	162	.451	73	89	5,487	716	1,346	247	22	198	677	473	55	1,251	123	41	6,093	2,231	467	33	45	29	109	.245	.407	.716