The Buffalo Bisons have the highest ERA by a team, with an ERA of 6.11.

	TEAM	ERA	G	W%	W	L	GS	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Bisons	6.11	134	.273	36	96	134	351	125		0	1141.0	1,499	775	1,199	67	673	48		5,658	78	2.77	5.31	0.52	0.53	6.2	11.9	1.90	.317	9.46	11.82
2	Rockies	5.02	5,066	.460	2,329	2,737	5,066	33,486	118	34	1,146	44791.1	48,667	25,001	26,955	5,936	17,853	1,905	1,336	197,520	1,917	6.73	3.59	1.88	1.19	17.0	9.0	1.49	.309	5.42	9.78
3	Stars	4.98	128	.433	55	72	128	454	115		0	1089.2	1,158	603	831	28	518	65		4,967	57	3.75	4.28	0.88	0.23	9.1	10.4	1.54	.290	6.86	9.56
4	Cowboys	4.85	126	.248	30	91	126	442	117		0	1066.2	1,345	575	872	27	246			4,805	95	3.73	2.08	1.80	0.23	9.2	5.1	1.49		7.36	11.35
5	Senators	4.72	1,265	.366	454	788	1,265	3,047	1,031		24	10745.2	13,330	5,635	8,777	367	4,319	651		49,546	411	2.55	3.62	0.71	0.31	6.1	8.7	1.64	.315	7.35	11.16
6	Gladiators	4.71	100	.263	26	73	100	230	96		0	879.0	1,011	460	733	21	421	57		4,093	69	2.35	4.31	0.55	0.22	5.6	10.3	1.63	.294	7.51	10.35
7	Mountain City	4.67	25	.240	6	19	25	93	20		0	219.2	292	114	216	3	52			1,027	14	3.81	2.13	1.79	0.12	9.1	5.1	1.57		8.85	11.96
8	Keystones	4.63	67	.313	21	46	67	310	64		0	593.1	726	305	545	7	105			2,677	80	4.70	1.59	2.95	0.11	11.6	3.9	1.40		8.27	11.01
9	Hoosiers	4.62	398	.370	146	249	398	1,041	359		3	3450.0	3,914	1,770	2,590	197	1,159	130		15,442	228	2.72	3.02	0.90	0.51	6.7	7.5	1.47	.288	6.76	10.21
10	Virginians	4.52	46	.286	12	30	46	167	45		0	370.1	402	186	294	14	52	17		1,634	19	4.06	1.26	3.21	0.34	10.2	3.2	1.23	.280	7.14	9.77
11	Cowboys	4.32	271	.364	98	171	271	828	256		2	2362.0	2,679	1,135	1,927	83	858	126		10,688	199	3.15	3.27	0.97	0.32	7.7	8.0	1.50	.295	7.34	10.21
12	Marlins	4.31	5,058	.459	2,322	2,736	5,058	36,703	157	67	1,204	45010.2	44,579	21,543	23,508	4,961	18,167	1,884	1,587	194,971	1,636	7.34	3.63	2.02	0.99	18.8	9.3	1.39	.297	4.70	8.91
13	Mariners	4.29	7,596	.477	3,625	3,969	7,596	49,918	587	152	1,825	67707.0	67,549	32,268	35,370	8,030	25,222	2,388	1,790	291,131	2,533	6.64	3.35	1.98	1.07	17.1	8.7	1.37	.290	4.70	8.98
14	Diamondbacks	4.29	4,319	.489	2,112	2,207	4,319	32,770	138	55	1,044	38580.2	38,158	18,370	20,030	4,872	13,682	1,509	1,037	165,479	1,477	7.64	3.19	2.40	1.14	19.8	8.3	1.34	.295	4.67	8.90
15	Rangers	4.28	10,174	.476	4,843	5,325	10,174	61,397	1,191	286	2,210	90605.1	91,189	43,127	47,857	9,997	34,938	3,058	2,340	391,560	3,386	6.10	3.47	1.76	0.99	15.7	8.9	1.39	.288	4.75	9.06
16	Royals	4.25	8,881	.477	4,234	4,645	8,881	52,458	955	240	2,033	79045.2	80,376	37,369	40,990	8,370	29,033	2,527	1,886	340,416	3,080	5.97	3.31	1.81	0.95	15.4	8.5	1.38	.290	4.67	9.15
17	Infants	4.23	131	.423	55	75	131	325	115		0	1143.2	1,386	537	1,027	45	571	55		5,460	86	2.56	4.49	0.57	0.35	6.0	10.5	1.71	.300	8.08	10.91
18	Blue Jays	4.22	7,598	.498	3,783	3,812	7,598	49,732	650	162	1,778	67805.0	67,345	31,781	34,760	7,886	25,119	2,427	1,616	291,092	2,432	6.60	3.33	1.98	1.05	17.1	8.6	1.36	.289	4.61	8.94
19	Rays	4.22	4,317	.489	2,112	2,205	4,317	32,414	105	41	1,110	38441.1	37,082	18,014	19,652	4,834	13,955	1,655	756	164,342	1,571	7.59	3.27	2.32	1.13	19.7	8.5	1.33	.289	4.60	8.68
20	Burghers	4.22	128	.469	60	68	128	318	121		0	1116.2	1,267	523	892	32	334	40		5,144	52	2.56	2.69	0.95	0.26	6.2	6.5	1.43	.279	7.19	10.21
21	Hoosiers	4.20	110	.271	29	78	110	479	107		0	937.2	1,000	438	755	30	199	28		4,160	75	4.60	1.91	2.41	0.29	11.5	4.8	1.28	.283	7.25	9.60
22	Giants	4.17	132	.565	74	57	132	449	111		6	1172.1	1,216	543	875	37	569	53		5,372	77	3.45	4.37	0.79	0.28	8.4	10.6	1.52	.277	6.72	9.34
23	Nationals	4.16	514	.326	163	337	514	1,690	485		0	4413.2	4,781	2,042	3,240	168	1,503	129		19,523	280	3.45	3.06	1.12	0.34	8.7	7.7	1.42	.288	6.61	9.75
24	Brewers	4.14	8,889	.487	4,330	4,555	8,889	54,740	929	208	2,154	79308.0	79,151	36,499	40,324	8,929	29,351	2,550	2,276	340,963	2,779	6.21	3.33	1.87	1.01	16.1	8.6	1.37	.286	4.58	8.98
25	Athletics	4.05	132	.519	68	63	132	361	118		2	1154.1	1,292	520	855	33	495	57		5,324	51	2.81	3.86	0.73	0.26	6.8	9.3	1.55	.288	6.67	10.07