least runs allowed in a season since 1902 by a team with at least 142 games

Since 1902, the Chicago Cubs have given up the fewest runs by a team with 142+ games pitched in a season, with 381 runs in 1906.

	TEAM	R	G	SEASON	W%	W	L	GS	ERA	SO	CG	SHO	SV	IP	H	ER	HR	BB	HBP	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Cubs	381	155	1906	.763	116	36	155	1.75	702	125	28	10	1388.1	1,018	270	12	446	53		5,427	20	4.55	2.89	1.57	0.08	12.9	8.2	1.05	.239	2.47	6.60
2	Cubs	389	155	1909	.680	104	49	155	1.74	680	111	32	11	1409.1	1,094	272	6	364	38		5,494	30	4.34	2.32	1.87	0.04	12.4	6.6	1.03	.247	2.48	6.99
3	Cubs	390	155	1907	.704	107	45	155	1.73	586	114	31	8	1373.1	1,054	264	11	402	38		5,315	25	3.84	2.63	1.46	0.07	11.0	7.6	1.06	.244	2.56	6.91
4	Athletics	416	153	1909	.621	95	58	153	1.93	728	110	27	3	1378.0	1,069	296	9	386	65		5,385	31	4.75	2.52	1.89	0.06	13.5	7.2	1.06	.253	2.72	6.98
5	Orioles	430	154	1972	.519	80	74	154	2.53	788	62	18	21	1371.2	1,116	386	85	395	15	52	5,493	35	5.17	2.59	1.99	0.56	14.3	7.2	1.10	.245	2.82	7.32
6	Pirates	440	142	1902	.741	103	36	142	2.30	564	131	21	3	1264.2	1,142	323	4	250	61		5,048	19	4.01	1.78	2.26	0.03	11.2	5.0	1.10	.273	3.13	8.13
7	Athletics	441	155	1910	.680	102	48	155	1.79	789	123	24	5	1421.2	1,103	282	8	450	55		5,503	39	4.99	2.85	1.75	0.05	14.3	8.2	1.09	.261	2.79	6.98
8	Cubs	442	155	1905	.601	92	61	155	2.04	627	133	23	2	1407.1	1,135	319	14	385	51		5,500	21	4.01	2.46	1.63	0.09	11.4	7.0	1.08	.253	2.83	7.26
9	Phillies	445	155	1908	.539	83	71	155	2.10	476	116	22	6	1393.0	1,167	325	8	379	43		5,400	26	3.08	2.45	1.26	0.05	8.8	7.0	1.11	.258	2.88	7.54
10	Pirates	448	154	1909	.724	110	42	154	2.07	490	93	21	11	1401.2	1,174	322	12	320	48		5,438	14	3.15	2.05	1.53	0.08	9.0	5.9	1.07	.254	2.88	7.54
11	White Sox	450	158	1905	.605	92	60	158	1.99	613	131	15	0	1427.0	1,163	315	11	329	31		5,542	39	3.87	2.07	1.86	0.07	11.1	5.9	1.05	.253	2.84	7.33
12	Braves	453	158	1916	.586	89	63	158	2.19	644	97	21	11	1415.2	1,206	345	24	325	30		5,612	23	4.09	2.07	1.98	0.15	11.5	5.8	1.08	.258	2.88	7.67
13	Giants	455	157	1908	.636	98	56	157	2.14	656	95	24	18	1411.0	1,210	336	26	288	35		5,544	18	4.18	1.84	2.28	0.17	11.8	5.2	1.06	.261	2.90	7.72
14	Athletics	457	155	1972	.600	93	62	155	2.58	862	42	15	43	1417.2	1,170	406	96	418	19	41	5,718	29	5.47	2.65	2.06	0.61	15.1	7.3	1.12	.248	2.90	7.43
15	Giants	457	158	1917	.636	98	56	158	2.27	551	92	17	14	1426.2	1,221	360	29	327	27		5,721	24	3.48	2.06	1.69	0.18	9.6	5.7	1.09	.249	2.88	7.70
16	Red Sox	457	157	1917	.592	90	62	157	2.20	509	115	14	7	1421.1	1,197	347	12	413	51		5,639	29	3.22	2.62	1.23	0.08	9.0	7.3	1.13	.255	2.89	7.58
17	Naps	459	157	1908	.584	90	64	157	2.02	548	108	18	5	1424.1	1,172	319	16	328	34		5,488	24	3.46	2.07	1.67	0.10	10.0	6.0	1.05	.253	2.90	7.41
18	White Sox	460	154	1906	.616	93	58	154	2.13	543	117	32	4	1375.1	1,212	326	11	255	32		5,345	33	3.55	1.67	2.13	0.07	10.2	4.8	1.07	.267	3.01	7.93
19	Cubs	461	158	1908	.643	99	55	158	2.14	668	108	27	12	1433.2	1,137	341	20	437	39		5,611	34	4.19	2.74	1.53	0.13	11.9	7.8	1.10	.251	2.89	7.14
20	White Sox	462	156	1917	.649	100	54	156	2.16	517	78	21	21	1424.1	1,236	342	10	413	35		5,645	12	3.27	2.61	1.25	0.06	9.2	7.3	1.16	.263	2.92	7.81
21	Phillies	463	153	1915	.592	90	62	153	2.17	652	98	20	8	1374.1	1,161	332	26	342	31		5,478	20	4.27	2.24	1.91	0.17	11.9	6.2	1.09	.256	3.03	7.60
22	White Sox	464	159	1909	.513	78	74	159	2.05	669	115	26	4	1430.1	1,182	326	8	340	52		5,560	29	4.21	2.14	1.97	0.05	12.0	6.1	1.06	.261	2.92	7.44
23	Pirates	464	154	1906	.608	93	60	154	2.21	532	116	26	2	1358.0	1,234	334	13	309	42		5,387	26	3.53	2.05	1.72	0.09	9.9	5.7	1.14	.272	3.08	8.18
24	Americans	466	157	1904	.617	95	59	157	2.12	612	148	21	1	1406.0	1,208	331	31	233	29		5,448	22	3.92	1.49	2.63	0.20	11.2	4.3	1.02	.259	2.98	7.73
25	Robins	470	156	1916	.610	94	60	156	2.12	634	96	22	9	1427.1	1,201	336	24	372	38		5,725	34	4.00	2.35	1.70	0.15	11.1	6.5	1.10	.253	2.96	7.57