Since 2009, the Colorado Rockies have the worst ERA by a team, with an ERA of 4.93.

	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	4.93	2,652	.443	1,175	1,477	2,652	19,255	31	14	604	23408.0	24,898	12,814	13,767	3,140	8,947	955	534	102,384	1,089	7.40	3.44	2.15	1.21	18.8	8.7	1.45	.310	5.29	9.57
2	Orioles	4.52	2,652	.470	1,246	1,406	2,652	19,766	22	8	666	23573.1	23,820	11,842	12,753	3,366	8,459	959	402	101,606	879	7.55	3.23	2.34	1.29	19.5	8.3	1.37	.296	4.87	9.09
3	Twins	4.41	2,653	.482	1,278	1,375	2,653	19,862	45	16	629	23568.0	24,003	11,540	12,443	3,081	7,517	947	396	100,938	873	7.58	2.87	2.64	1.18	19.7	7.4	1.34	.301	4.75	9.17
4	Royals	4.38	2,652	.457	1,212	1,440	2,652	19,803	45	15	675	23475.0	23,542	11,428	12,276	2,896	8,709	959	353	101,134	1,035	7.59	3.34	2.27	1.11	19.6	8.6	1.37	.300	4.71	9.03
5	Diamondbacks	4.31	2,652	.478	1,267	1,385	2,652	20,802	34	17	635	23671.1	23,358	11,342	12,316	3,061	8,343	904	560	101,419	943	7.91	3.17	2.49	1.16	20.5	8.2	1.34	.297	4.68	8.88
6	Rangers	4.30	2,653	.501	1,329	1,324	2,653	20,045	63	27	638	23535.0	22,860	11,242	12,181	3,094	8,481	1,006	352	100,629	908	7.67	3.24	2.36	1.18	19.9	8.4	1.33	.291	4.66	8.74
7	Tigers	4.29	2,648	.485	1,285	1,363	2,648	20,381	48	21	645	23489.2	23,137	11,200	12,187	2,928	8,152	910	400	100,367	919	7.81	3.12	2.50	1.12	20.3	8.1	1.33	.297	4.67	8.86
8	White Sox	4.28	2,651	.450	1,193	1,458	2,651	21,211	59	22	584	23504.0	22,808	11,176	12,210	3,006	8,994	996	487	101,072	1,082	8.12	3.44	2.36	1.15	21.0	8.9	1.35	.296	4.68	8.73
9	Angels	4.27	2,652	.491	1,303	1,349	2,652	20,744	57	34	643	23592.1	22,680	11,205	12,119	3,091	8,828	984	492	100,978	1,077	7.91	3.37	2.35	1.18	20.5	8.7	1.34	.291	4.62	8.65
10	Marlins	4.24	2,650	.448	1,186	1,464	2,650	20,844	43	20	629	23566.0	22,722	11,106	12,071	2,727	8,922	1,053	733	101,142	862	7.96	3.41	2.34	1.04	20.6	8.8	1.34	.296	4.61	8.68
11	Reds	4.23	2,652	.479	1,271	1,381	2,652	21,432	50	25	657	23620.0	22,351	11,111	11,938	3,235	8,924	1,125	507	101,088	806	8.17	3.40	2.40	1.23	21.2	8.8	1.32	.288	4.55	8.52
12	Blue Jays	4.23	2,652	.506	1,341	1,311	2,652	21,165	51	23	636	23616.2	22,803	11,107	12,055	3,140	8,411	1,044	375	100,853	847	8.07	3.21	2.52	1.20	21.0	8.3	1.32	.293	4.59	8.69
13	Pirates	4.21	2,650	.460	1,219	1,430	2,650	20,399	33	14	652	23524.1	23,104	11,003	12,039	2,695	8,743	1,174	515	101,394	992	7.80	3.34	2.33	1.03	20.1	8.6	1.35	.298	4.61	8.84
14	Red Sox	4.20	2,652	.531	1,409	1,243	2,652	22,231	55	18	655	23718.1	22,994	11,077	12,070	2,935	8,547	1,121	324	101,630	906	8.44	3.24	2.60	1.11	21.9	8.4	1.33	.300	4.58	8.73
15	Nationals	4.17	2,651	.487	1,292	1,359	2,651	20,941	40	19	670	23515.0	22,830	10,883	11,843	2,935	8,156	967	553	100,446	832	8.01	3.12	2.57	1.12	20.8	8.1	1.32	.295	4.53	8.74
16	Athletics	4.11	2,652	.487	1,291	1,361	2,652	19,949	45	26	621	23620.1	22,562	10,793	11,741	2,913	8,142	944	417	100,398	975	7.60	3.10	2.45	1.11	19.9	8.1	1.30	.287	4.47	8.60
17	Phillies	4.11	2,652	.512	1,358	1,294	2,652	21,885	81	41	654	23628.0	22,998	10,777	11,678	2,968	7,778	997	491	100,524	726	8.34	2.96	2.81	1.13	21.8	7.7	1.30	.299	4.45	8.76
18	Mets	4.00	2,652	.495	1,314	1,338	2,652	21,919	44	25	660	23589.1	22,505	10,496	11,422	2,751	8,388	1,015	540	100,614	802	8.36	3.20	2.61	1.05	21.8	8.3	1.31	.297	4.36	8.59
19	Mariners	4.00	2,652	.495	1,313	1,339	2,652	20,785	61	27	716	23694.2	22,235	10,536	11,467	3,058	7,564	923	459	99,682	1,003	7.89	2.87	2.75	1.16	20.9	7.6	1.26	.285	4.36	8.45
20	Padres	3.98	2,652	.484	1,284	1,368	2,652	21,951	25	17	698	23591.2	21,911	10,440	11,368	2,815	8,496	967	524	99,991	869	8.37	3.24	2.58	1.07	22.0	8.5	1.29	.290	4.34	8.36
21	Brewers	3.97	2,653	.526	1,396	1,257	2,653	22,090	18	11	748	23635.1	22,048	10,436	11,426	2,962	8,544	937	446	100,380	869	8.41	3.25	2.59	1.13	22.0	8.5	1.29	.290	4.35	8.40
22	Cubs	3.97	2,652	.504	1,337	1,314	2,652	21,729	33	16	649	23605.1	21,789	10,404	11,422	2,847	8,721	1,033	461	100,264	910	8.28	3.33	2.49	1.09	21.7	8.7	1.29	.287	4.35	8.31
23	Astros	3.97	2,651	.512	1,358	1,293	2,651	22,512	47	19	656	23612.1	21,967	10,403	11,316	2,884	8,388	911	355	99,976	962	8.58	3.20	2.68	1.10	22.5	8.4	1.29	.292	4.31	8.37
24	Guardians	3.93	2,649	.522	1,383	1,266	2,649	21,867	65	27	670	23599.1	22,157	10,308	11,259	2,833	8,010	898	402	99,579	850	8.34	3.05	2.73	1.08	22.0	8.0	1.28	.293	4.29	8.45
25	Yankees	3.90	2,652	.572	1,518	1,134	2,652	22,940	46	22	756	23650.0	21,768	10,245	11,131	3,037	8,012	1,000	319	99,817	1,001	8.73	3.05	2.86	1.16	23.0	8.0	1.26	.289	4.24	8.28