Between the 1946 and 1966 seasons, the New York Mets had the worst record by a team, with a record of 260-547.

	TEAM	REC	W%	G	W	L	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Mets	260-547	.322	811	260	547	27,206	2,769	6,346	907	168	543	2,553	2,264	208	5,122	219	219	30,135	9,218	1,618	295	162	188	623	.233	.296	.339	.634
2	Senators	380-587	.393	968	380	587	32,384	3,521	7,632	1,176	218	776	3,298	3,055	148	5,987	378	214	36,223	11,572	2,170	414	222	192	734	.236	.303	.357	.660
3	Astros	333-475	.412	811	333	475	27,239	2,732	6,472	893	204	446	2,514	2,323	197	4,378	301	192	30,332	9,111	1,543	402	171	227	617	.238	.300	.334	.635
4	Athletics	1370-1908	.418	3,294	1,370	1,908	111,266	13,432	27,981	4,459	950	2,163	12,536	11,547	551	15,050	990	486	125,509	40,829	7,572	1,664	481	370	2,752	.251	.324	.367	.691
5	Cubs	1420-1851	.434	3,292	1,420	1,851	112,365	13,287	28,341	4,495	990	2,743	12,452	10,086	608	17,228	1,045	574	124,930	43,045	8,228	1,374	497	651	2,459	.252	.316	.383	.699
6	Twins	1481-1795	.452	3,289	1,481	1,795	111,197	13,688	27,826	4,417	993	2,370	12,829	11,961	675	15,464	980	528	125,876	41,339	7,780	1,514	529	482	2,698	.250	.325	.372	.697
7	Pirates	1494-1778	.457	3,287	1,494	1,778	112,261	13,592	29,161	4,453	1,133	2,385	12,700	10,121	523	15,693	846	516	125,047	43,035	7,971	1,608	534	688	2,586	.260	.322	.383	.706
8	Orioles	1504-1772	.459	3,290	1,504	1,772	111,100	12,983	27,651	4,472	782	2,277	12,115	11,369	503	16,083	961	551	125,239	40,518	7,531	1,760	507	483	2,738	.249	.320	.365	.685
9	Angels	463-507	.477	971	463	507	32,505	3,734	7,906	1,223	212	737	3,474	3,171	188	5,856	362	235	36,603	11,764	2,172	486	253	248	684	.243	.312	.362	.674
10	Phillies	1583-1689	.484	3,285	1,583	1,689	111,483	13,553	28,510	4,556	1,030	2,364	12,595	10,704	647	15,971	1,028	545	124,996	42,218	7,950	1,646	516	628	2,506	.256	.323	.379	.702
11	Reds	1608-1662	.492	3,278	1,608	1,662	112,379	14,409	29,110	4,870	791	2,876	13,522	10,376	603	15,436	1,202	585	125,457	44,190	8,537	1,545	554	678	2,345	.259	.324	.393	.717
12	Tigers	1678-1603	.511	3,300	1,678	1,603	112,356	14,807	29,102	4,531	883	2,746	13,879	12,644	579	14,495	1,009	518	127,831	43,637	8,160	1,706	546	488	2,750	.259	.336	.388	.724
13	Red Sox	1692-1587	.516	3,290	1,692	1,587	112,766	15,621	29,704	5,199	828	2,847	14,724	13,366	541	15,688	815	424	128,618	45,100	8,874	1,423	522	490	2,980	.263	.343	.400	.743
14	White Sox	1733-1547	.528	3,299	1,733	1,547	111,750	13,967	28,713	4,359	945	1,937	12,983	11,970	932	13,747	1,729	742	127,149	40,773	7,241	1,886	611	484	2,598	.257	.332	.365	.697
15	Cardinals	1743-1531	.532	3,290	1,743	1,531	113,280	14,805	30,194	5,045	1,080	2,416	13,752	10,858	606	14,188	1,140	674	126,673	44,647	8,541	1,405	524	666	2,522	.267	.333	.394	.727
16	Giants	1748-1531	.533	3,288	1,748	1,531	112,269	15,073	29,047	4,243	915	3,505	14,080	10,771	660	14,902	1,104	556	125,728	45,635	8,663	1,482	546	662	2,465	.259	.326	.406	.732
17	Braves	1787-1486	.546	3,292	1,787	1,486	112,430	15,020	29,388	4,763	848	3,152	14,073	10,966	618	15,266	1,118	495	126,342	45,303	8,763	1,790	538	730	2,530	.261	.329	.403	.732
18	Indians	1798-1482	.548	3,295	1,798	1,482	112,011	14,698	28,756	4,405	731	3,096	13,827	11,706	660	15,734	1,003	550	126,678	43,911	8,232	1,711	590	487	2,478	.257	.329	.392	.721
19	Dodgers	1928-1354	.587	3,296	1,928	1,354	111,863	15,655	29,341	4,526	936	2,951	14,503	12,298	645	15,727	2,082	842	127,325	44,592	8,413	1,959	560	659	2,535	.262	.337	.399	.736
20	Yankees	1982-1293	.605	3,286	1,982	1,293	112,157	16,052	29,445	4,448	1,031	3,325	15,066	12,116	626	14,993	931	483	127,077	45,930	8,804	1,642	536	575	2,386	.263	.336	.410	.746