what is the single season home run record for a team before the year 2000

The Houston Astros launched the most homers by a team in 2000, with 249 home runs.

	TEAM	HR	G	W%	W	L	AB	R	H	2B	3B	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Astros	249	162	.444	72	90	5,570	938	1,547	289	36	900	673	83	1,129	114	52	6,444	2,655	574	57	61	57	154	.278	.361	.477	.837
2	Blue Jays	244	162	.512	83	79	5,677	861	1,562	328	21	826	526	60	1,026	89	34	6,326	2,664	593	29	34	32	130	.275	.341	.469	.810
3	Athletics	239	161	.565	91	70	5,560	947	1,501	281	23	908	750	52	1,159	40	15	6,432	2,545	543	26	44	32	147	.270	.360	.458	.817
4	Angels	236	162	.506	82	80	5,628	864	1,574	309	34	837	608	47	1,024	93	52	6,373	2,659	579	47	43	43	126	.280	.352	.472	.825
5	Cardinals	235	162	.586	95	67	5,478	887	1,481	259	25	841	675	84	1,253	87	51	6,369	2,495	519	79	53	33	116	.270	.356	.455	.812
6	Giants	226	162	.599	97	65	5,519	925	1,535	304	44	889	709	51	1,032	79	39	6,418	2,605	574	73	66	60	131	.278	.362	.472	.834
7	Indians	221	162	.556	90	72	5,683	950	1,639	310	30	889	685	51	1,057	113	34	6,512	2,672	561	41	52	27	134	.288	.367	.470	.837
8	White Sox	216	162	.586	95	67	5,646	978	1,615	325	33	926	591	53	960	119	42	6,406	2,654	574	55	61	28	140	.286	.356	.470	.826
9	Dodgers	211	162	.531	86	76	5,481	798	1,408	265	28	756	668	51	1,083	95	42	6,312	2,362	504	66	46	42	129	.257	.341	.431	.771
10	Yankees	205	161	.540	87	74	5,556	871	1,541	294	25	833	631	57	1,007	99	48	6,310	2,500	524	16	50	42	134	.277	.354	.450	.804
11	Reds	200	163	.525	85	77	5,635	825	1,545	302	36	794	559	64	995	100	38	6,372	2,519	538	56	58	60	137	.274	.343	.447	.790
12	Mets	198	162	.580	94	68	5,486	807	1,445	281	20	761	675	45	1,037	66	46	6,327	2,360	499	70	51	42	122	.263	.346	.430	.776
13	Mariners	198	162	.562	91	71	5,497	907	1,481	300	26	869	775	48	1,073	122	56	6,444	2,427	524	63	61	34	129	.269	.361	.442	.803
14	Orioles	184	162	.457	74	88	5,549	794	1,508	310	22	750	558	49	900	126	65	6,237	2,414	516	27	54	34	148	.272	.341	.435	.776
15	Cubs	183	162	.401	65	97	5,577	764	1,426	272	23	722	632	54	1,120	93	37	6,397	2,293	478	89	45	50	114	.256	.335	.411	.746
16	Braves	179	162	.586	95	67	5,489	810	1,490	274	26	758	595	59	1,010	148	56	6,275	2,353	479	87	45	38	127	.271	.346	.429	.775
17	Diamondbacks	179	162	.525	85	77	5,527	792	1,466	282	44	756	535	59	975	97	44	6,240	2,373	505	61	58	37	114	.265	.333	.429	.763
18	Expos	178	162	.414	67	95	5,535	738	1,475	310	35	705	476	29	1,048	58	48	6,152	2,389	523	78	34	53	111	.266	.326	.432	.758
19	Tigers	177	162	.488	79	83	5,644	823	1,553	307	41	785	562	43	982	83	38	6,340	2,473	525	42	49	22	142	.275	.343	.438	.781
20	Brewers	177	163	.451	73	89	5,563	740	1,366	297	25	708	620	61	1,245	72	44	6,354	2,244	499	61	49	47	126	.246	.325	.403	.729
21	Rangers	173	162	.438	71	91	5,648	848	1,601	330	35	806	580	39	922	69	47	6,363	2,520	538	48	48	39	161	.283	.352	.446	.798
22	Pirates	168	162	.426	69	93	5,643	793	1,506	320	31	749	564	66	1,032	86	40	6,369	2,392	519	59	37	41	133	.267	.339	.424	.762
23	Red Sox	167	162	.525	85	77	5,630	792	1,503	316	32	755	611	42	1,019	43	30	6,371	2,384	515	40	48	40	115	.267	.341	.423	.764
24	Devil Rays	162	161	.429	69	92	5,505	733	1,414	253	22	692	558	51	1,022	90	46	6,206	2,197	437	52	40	25	126	.257	.329	.399	.728
25	Rockies	161	162	.506	82	80	5,660	968	1,664	320	53	905	601	42	907	131	61	6,453	2,573	534	75	75	64	126	.294	.362	.455	.816