Since 1993, the Colorado Rockies have the worst ERA by a team, with an ERA of 5.02.

	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	Rockies	5.02	5,053	.461	2,327	2,726	5,053	33,405	118	34	1,145	44679.1	48,518	24,911	26,845	5,919	17,809	1,898	1,336	196,990	1,910	6.73	3.59	1.88	1.19	17.0	9.0	1.48	.309	5.41	9.77
2	Rangers	4.67	5,052	.498	2,515	2,536	5,052	34,053	180	59	1,254	44805.1	46,702	23,247	25,266	5,750	17,115	1,861	889	195,439	1,731	6.84	3.44	1.99	1.15	17.4	8.8	1.42	.300	5.08	9.38
3	Royals	4.66	5,047	.446	2,251	2,796	5,047	33,388	173	50	1,191	44756.2	46,721	23,168	25,011	5,632	17,182	1,768	921	194,872	2,041	6.71	3.46	1.94	1.13	17.1	8.8	1.43	.300	5.03	9.40
4	Orioles	4.63	5,047	.472	2,380	2,664	5,047	34,442	192	50	1,216	44850.2	45,952	23,084	24,805	6,068	17,377	1,744	952	194,850	1,618	6.91	3.49	1.98	1.22	17.7	8.9	1.41	.295	4.98	9.22
5	Tigers	4.62	5,045	.461	2,326	2,719	5,045	33,606	169	53	1,172	44768.0	46,441	22,971	25,056	5,697	16,565	1,749	1,160	194,371	1,816	6.76	3.33	2.03	1.15	17.3	8.5	1.41	.298	5.04	9.34
6	Twins	4.50	5,049	.487	2,457	2,591	5,049	34,197	162	59	1,226	44957.1	47,123	22,490	24,275	5,902	14,364	1,553	801	193,376	1,657	6.85	2.88	2.38	1.18	17.7	7.4	1.37	.300	4.86	9.43
7	Pirates	4.41	5,046	.449	2,264	2,780	5,046	34,892	127	46	1,203	44821.1	45,885	21,963	24,084	5,095	17,225	2,035	1,439	194,951	1,792	7.01	3.46	2.03	1.02	17.9	8.8	1.41	.301	4.84	9.21
8	Reds	4.39	5,054	.482	2,433	2,618	5,054	36,623	134	53	1,265	45056.2	44,778	21,984	23,826	6,032	17,045	1,918	1,269	194,615	1,696	7.32	3.40	2.15	1.20	18.8	8.8	1.37	.291	4.76	8.94
9	White Sox	4.39	5,049	.489	2,469	2,577	5,049	35,863	194	61	1,215	44876.1	44,895	21,867	23,945	5,678	16,994	1,746	1,081	193,734	1,856	7.19	3.41	2.11	1.14	18.5	8.8	1.38	.294	4.80	9.00
10	Blue Jays	4.34	5,050	.499	2,521	2,528	5,050	36,372	240	82	1,213	44991.1	44,908	21,692	23,619	5,662	16,646	1,853	964	193,784	1,669	7.28	3.33	2.19	1.13	18.8	8.6	1.37	.295	4.72	8.98
11	Angels	4.32	5,049	.505	2,552	2,497	5,049	35,672	179	68	1,329	44976.2	44,499	21,609	23,446	5,695	16,855	1,801	946	193,415	1,977	7.14	3.37	2.12	1.14	18.4	8.7	1.36	.291	4.69	8.90
12	Marlins	4.31	5,044	.459	2,316	2,728	5,044	36,587	157	67	1,202	44887.1	44,467	21,485	23,446	4,948	18,128	1,881	1,584	194,460	1,632	7.34	3.63	2.02	0.99	18.8	9.3	1.39	.297	4.70	8.92
13	Brewers	4.29	5,050	.489	2,469	2,580	5,050	36,710	130	39	1,314	45020.1	44,415	21,465	23,493	5,689	17,262	1,773	1,187	194,215	1,709	7.34	3.45	2.13	1.14	18.9	8.9	1.37	.292	4.70	8.88
14	Diamondbacks	4.28	4,305	.489	2,104	2,201	4,305	32,640	138	55	1,038	38454.2	38,021	18,295	19,951	4,851	13,627	1,506	1,034	164,921	1,475	7.64	3.19	2.40	1.14	19.8	8.3	1.34	.295	4.67	8.90
15	Mariners	4.28	5,045	.502	2,535	2,510	5,045	36,026	199	75	1,302	44985.0	44,287	21,387	23,180	5,644	16,124	1,754	1,035	192,689	1,730	7.21	3.23	2.23	1.13	18.7	8.4	1.34	.290	4.64	8.86
16	Red Sox	4.28	5,051	.541	2,732	2,319	5,051	38,260	153	50	1,304	45156.1	44,709	21,460	23,506	5,260	16,293	2,108	901	194,385	1,578	7.63	3.25	2.35	1.05	19.7	8.4	1.35	.298	4.68	8.91
17	Phillies	4.25	5,049	.504	2,545	2,504	5,049	37,833	226	91	1,249	45058.0	44,570	21,279	23,138	5,555	16,088	1,871	1,221	193,514	1,590	7.56	3.21	2.35	1.11	19.6	8.3	1.35	.295	4.62	8.90
18	Athletics	4.24	5,048	.503	2,538	2,510	5,048	34,441	177	67	1,234	45036.2	44,572	21,227	23,178	5,246	16,547	1,731	1,135	193,450	1,698	6.88	3.31	2.08	1.05	17.8	8.6	1.36	.290	4.63	8.91
19	Rays	4.22	4,303	.489	2,106	2,197	4,303	32,325	105	41	1,107	38317.1	36,956	17,947	19,583	4,812	13,912	1,651	756	163,814	1,569	7.59	3.27	2.32	1.13	19.7	8.5	1.33	.289	4.60	8.68
20	Guardians	4.20	5,043	.531	2,678	2,365	5,043	37,048	195	68	1,259	45017.1	44,776	21,007	22,963	5,319	15,920	1,659	1,016	192,715	1,576	7.41	3.18	2.33	1.06	19.2	8.3	1.35	.297	4.59	8.95
21	Nationals	4.20	5,049	.481	2,426	2,622	5,049	36,274	158	58	1,289	44882.2	44,429	20,933	23,010	5,329	16,031	1,855	1,343	192,982	1,579	7.27	3.21	2.26	1.07	18.8	8.3	1.35	.293	4.61	8.91
22	Cubs	4.15	5,050	.495	2,497	2,551	5,050	39,112	145	57	1,232	45074.0	43,035	20,808	22,737	5,480	17,413	1,817	1,215	193,504	1,665	7.81	3.48	2.25	1.09	20.2	9.0	1.34	.290	4.54	8.59
23	Padres	4.12	5,052	.480	2,426	2,626	5,052	38,121	107	45	1,326	45093.1	43,576	20,635	22,619	5,278	16,407	1,696	1,325	192,919	1,665	7.61	3.27	2.32	1.05	19.8	8.5	1.33	.291	4.51	8.70
24	Yankees	4.09	5,047	.583	2,942	2,102	5,047	38,530	177	64	1,450	45046.0	43,533	20,490	22,227	5,375	15,549	1,769	839	191,935	1,737	7.70	3.11	2.48	1.07	20.1	8.1	1.31	.292	4.44	8.70
25	Mets	4.03	5,047	.500	2,525	2,522	5,047	37,364	154	70	1,273	45031.2	43,785	20,162	22,023	5,125	16,190	1,764	1,412	192,719	1,378	7.47	3.24	2.31	1.02	19.4	8.4	1.33	.292	4.40	8.75