most walks in a month by a player mlb from 1980 to 2000

Between the 1980 and 2000 seasons, Jack Clark had the most bases on balls in a month, with 41 walks in July 1987.

	NAME	BB	MONTH	G	AB	R	H	2B	3B	HR	RBI	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Jack Clark J. Clark	41	July 1987	25	71	17	19	3	0	6	19	0	28	1	1	113	40	9	0	1	6	0	.268	.531	.563	1.094
2	Frank Thomas F. Thomas	36	May 1995	25	81	18	25	5	0	6	17	2	14	1	0	119	48	11	0	0	10	1	.309	.529	.593	1.122
3	Barry Bonds B. Bonds	35	September 1996	26	69	20	22	2	0	7	20	0	7	15	4	108	45	9	0	4	9	1	.319	.528	.652	1.180
4	Dave Hollins D. Hollins	34	May 1995	28	90	26	21	5	1	3	10	1	16	1	0	127	37	9	0	2	4	2	.233	.441	.411	.852
5	Mark McGwire M. McGwire	33	July 1998	27	80	19	17	0	0	8	13	1	18	0	0	115	41	8	0	1	10	4	.213	.443	.513	.956
6	Mark McGwire M. McGwire	33	May 1998	26	86	25	28	2	0	16	32	0	27	0	0	119	78	18	0	0	5	0	.326	.513	.907	1.420
7	Jim Thome J. Thome	33	August 1995	28	75	15	23	9	0	1	9	2	18	1	1	111	35	10	0	1	0	1	.307	.523	.467	.989
8	Barry Bonds B. Bonds	33	September 1992	28	92	28	37	10	1	9	25	0	14	9	0	126	76	20	0	1	9	1	.402	.556	.826	1.382
9	Dale Murphy D. Murphy	33	May 1987	28	97	25	31	3	0	11	20	1	25	2	2	132	67	14	0	1	7	4	.320	.492	.691	1.183
10	Mark McGwire M. McGwire	32	May 2000	26	79	25	25	3	0	13	28	0	22	0	0	111	67	16	0	0	6	2	.316	.514	.848	1.362
11	Mark McGwire M. McGwire	31	August 1998	28	90	21	26	7	0	10	19	1	39	1	0	123	63	17	0	1	3	0	.289	.472	.700	1.172
12	Barry Bonds B. Bonds	31	May 1998	29	97	20	37	8	0	9	30	0	14	5	4	130	72	17	0	2	6	3	.381	.523	.742	1.265
13	Gary Sheffield G. Sheffield	31	September 1996	26	62	17	20	3	0	5	14	4	9	2	4	99	38	8	0	2	4	1	.323	.556	.613	1.168
14	Mark McGwire M. McGwire	31	June 1996	26	82	26	27	6	0	14	25	0	26	0	0	113	75	20	0	0	2	4	.329	.513	.915	1.428
15	Edgar Martinez E. Martinez	31	August 1995	29	98	31	39	11	0	9	33	5	13	0	2	134	77	20	0	0	2	3	.398	.560	.786	1.345
16	Frank Thomas F. Thomas	31	May 1994	25	84	39	38	9	0	12	28	1	11	0	0	118	83	21	0	2	3	3	.452	.593	.988	1.581
17	Jack Clark J. Clark	31	September 1990	27	73	11	17	2	0	5	12	0	21	1	0	104	34	7	0	0	3	2	.233	.462	.466	.927
18	Rickey Henderson R. Henderson	31	April 1982	22	79	21	18	4	0	1	7	0	10	22	7	110	25	5	0	0	0	1	.228	.445	.316	.762
19	Willie Randolph W. Randolph	31	June 1980	27	95	27	26	3	2	0	1	1	11	11	1	127	33	5	0	0	0	1	.274	.457	.347	.804
20	Jason Giambi J. Giambi	30	June 2000	25	80	24	36	11	0	5	23	1	14	1	0	111	62	16	0	0	2	2	.450	.604	.775	1.379
21	Ken Griffey Jr. K. Griffey Jr.	30	May 2000	27	87	19	18	4	0	7	14	3	20	2	1	120	43	11	0	0	4	1	.207	.425	.494	.919
22	Jeff Bagwell J. Bagwell	30	June 1999	28	93	30	28	3	0	11	23	1	23	3	2	125	64	14	0	1	5	0	.301	.472	.688	1.160
23	Jeff Bagwell J. Bagwell	30	August 1997	28	96	18	23	5	0	9	18	1	22	3	3	129	55	14	0	2	5	4	.240	.419	.573	.992
24	Barry Bonds B. Bonds	30	August 1997	28	96	20	24	6	0	4	14	1	20	7	2	127	42	10	0	0	6	3	.250	.433	.438	.871
25	Barry Bonds B. Bonds	30	July 1995	27	92	24	28	6	0	9	22	1	16	4	1	123	61	15	0	0	6	2	.304	.480	.663	1.143