300 innings pitched since 1962.

162 innings pitched is the requirement to qualify for leading in Earned Run Average (ERA). Here are the number of pitchers to reach that in recent seasons:

	AL	NL	tot
2021	15	22	37
2019	22	34	56
2018	27	28	55
2017	23	31	54
2016	39	30	69
2015	36	38	74
2014	39	43	82
2013	37	43	80
2012	36	46	82

NL pitchers were pitching to each other, which might be why more of them reach 162.

64 seasons from 1962 through 2021, including multiples by some pitchers sorted by name and year below. The most recent season is 1980 when 36 year old Steve Carlton threw 304 innings. In 1962 Don Drysdale threw 314. Age is year pitched minus birth year.

First	Last	year	Age	Inn	L	team	W	L	ERA	G	GS	CG	SO	BB	HR	Last
Vida	Blue	1971	23	312.00	AL	OAK	24	8	1.82	39	39	24	301	88	19	Blue
Bert	Blyleven	1973	22	325.00	AL	MIN	20	17	2.52	40	40	25	258	67	16	Blyleven
Jim	Bunning	1966	35	314.00	NL	PHI	19	14	2.41	43	41	16	252	55	26	Bunning
Jim	Bunning	1967	36	302.33	NL	PHI	17	15	2.29	40	40	16	253	73	18	Bunning
Steve	Carlton	1972	28	346.33	NL	PHI	27	10	1.97	41	41	30	310	87	17	Carlton
Steve	Carlton	1980	36	304.00	NL	PHI	24	9	2.34	38	38	13	286	90	15	Carlton
Jim	Colborn	1973	27	314.33	AL	ML4	20	12	3.18	43	36	22	135	87	21	Colborn
Larry	Dierker	1969	23	305.33	NL	HOU	20	13	2.33	39	37	20	232	72	18	Dierker
Don	Drysdale	1962	26	314.33	NL	LAN	25	9	2.83	43	41	19	232	78	21	Drysdale
Don	Drysdale	1963	27	315.33	NL	LAN	19	17	2.63	42	42	17	251	57	25	Drysdale
Don	Drysdale	1964	28	321.33	NL	LAN	18	16	2.18	40	40	21	237	68	15	Drysdale
Don	Drysdale	1965	29	308.33	NL	LAN	23	12	2.77	44	42	20	210	66	30	Drysdale
Bob	Gibson	1968	33	304.67	NL	SLN	22	9	1.12	34	34	28	268	62	11	Gibson
Bob	Gibson	1969	34	314.00	NL	SLN	20	13	2.18	35	35	28	269	95	12	Gibson
Dave	Goltz	1977	28	303.00	AL	MIN	20	11	3.36	39	39	19	186	91	23	Goltz
Catfish	Hunter	1974	28	318.33	AL	OAK	25	12	2.49	41	41	23	143	46	25	Hunter
Catfish	Hunter	1975	29	328.00	AL	NYA	23	14	2.58	39	39	30	177	83	25	Hunter
Fergie	Jenkins	1968	26	308.00	NL	CHN	20	15	2.63	40	40	20	260	65	26	Jenkins
Fergie	Jenkins	1969	27	311.33	NL	CHN	21	15	3.21	43	42	23	273	71	27	Jenkins
Fergie	Jenkins	1970	28	313.00	NL	CHN	22	16	3.39	40	39	24	274	60	30	Jenkins
Fergie	Jenkins	1971	29	325.00	NL	CHN	24	13	2.77	39	39	30	263	37	29	Jenkins
Fergie	Jenkins	1974	32	328.33	AL	TEX	25	12	2.82	41	41	29	225	45	27	Jenkins
Randy	Jones	1976	26	315.33	NL	SDN	22	14	2.74	40	40	25	93	50	15	Jones
Jim	Kaat	1966	28	304.67	AL	MIN	25	13	2.75	41	41	19	205	55	29	Kaat
Jim	Kaat	1975	37	303.67	AL	CHA	20	14	3.11	43	41	12	142	77	20	Kaat
Sandy	Koufax	1963	28	311.00	NL	LAN	25	5	1.88	40	40	20	306	58	18	Koufax
Sandy	Koufax	1965	30	335.67	NL	LAN	26	8	2.04	43	41	27	382	71	26	Koufax
Sandy	Koufax	1966	31	323.00	NL	LAN	27	9	1.73	41	41	27	317	77	19	Koufax
Mickey	Lolich	1971	31	376.00	AL	DET	25	14	2.92	45	45	29	308	92	36	Lolich
Mickey	Lolich	1972	32	327.33	AL	DET	22	14	2.50	41	41	23	250	74	29	Lolich
Mickey	Lolich	1973	33	308.67	AL	DET	16	15	3.82	42	42	17	214	79	35	Lolich
Mickey	Lolich	1974	34	308.00	AL	DET	16	21	4.15	41	41	27	202	78	38	Lolich
Juan	Marichal	1963	26	321.33	NL	SFN	25	8	2.41	41	40	18	248	61	27	Marichal
Juan	Marichal	1966	29	307.33	NL	SFN	25	6	2.23	37	36	25	222	36	32	Marichal
Juan	Marichal	1968	31	326.00	NL	SFN	26	9	2.43	38	38	30	218	46	21	Marichal
Sam	McDowell	1970	28	305.00	AL	CLE	20	12	2.92	39	39	19	304	131	25	McDowell
Denny	McLain	1968	24	336.00	AL	DET	31	6	1.96	41	41	28	280	63	31	McLain
Denny	McLain	1969	25	325.00	AL	DET	24	9	2.80	42	41	23	181	67	25	McLain
Andy	Messersmith	1975	30	321.67	NL	LAN	19	14	2.29	42	40	19	213	96	22	Messersmith
Phil	Niekro	1974	35	302.33	NL	ATL	20	13	2.38	41	39	18	195	88	19	Niekro
Phil	Niekro	1977	38	330.33	NL	ATL	16	20	4.03	44	43	20	262	164	26	Niekro
Phil	Niekro	1978	39	334.33	NL	ATL	19	18	2.88	44	42	22	248	102	16	Niekro
Phil	Niekro	1979	40	342.00	NL	ATL	21	20	3.39	44	44	23	208	113	41	Niekro
Claude	Osteen	1969	30	321.00	NL	LAN	20	15	2.66	41	41	16	183	74	17	Osteen
Jim	Palmer	1970	25	305.00	AL	BAL	20	10	2.71	39	39	17	199	100	21	Palmer
Jim	Palmer	1975	30	323.00	AL	BAL	23	11	2.09	39	38	25	193	80	20	Palmer
Jim	Palmer	1976	31	315.00	AL	BAL	22	13	2.51	40	40	23	159	84	20	Palmer
Jim	Palmer	1977	32	319.00	AL	BAL	20	11	2.91	39	39	22	193	99	24	Palmer
Gaylord	Perry	1969	31	325.33	NL	SFN	19	14	2.49	40	39	26	233	91	23	Perry
Gaylord	Perry	1970	32	328.67	NL	SFN	23	13	3.20	41	41	23	214	84	27	Perry
Gaylord	Perry	1972	34	342.67	AL	CLE	24	16	1.92	41	40	29	234	82	17	Perry
Gaylord	Perry	1973	35	344.00	AL	CLE	19	19	3.38	41	41	29	238	115	34	Perry
Gaylord	Perry	1974	36	322.33	AL	CLE	21	13	2.51	37	37	28	216	99	25	Perry
Steve	Rogers	1977	28	301.67	NL	MON	17	16	3.10	40	40	17	206	81	16	Rogers
Nolan	Ryan	1973	26	326.00	AL	CAL	21	16	2.87	41	39	26	383	162	18	Ryan
Nolan	Ryan	1974	27	332.67	AL	CAL	22	16	2.89	42	41	26	367	202	18	Ryan
Bill	Singer	1969	25	315.67	NL	LAN	20	12	2.34	41	40	16	247	74	22	Singer
Bill	Singer	1973	29	315.67	AL	CAL	20	14	3.22	40	40	19	241	130	15	Singer
Mel	Stottlemyre	1969	28	303.00	AL	NYA	20	14	2.82	39	39	24	113	97	19	Stottlemyre
Luis	Tiant	1974	34	311.33	AL	BOS	22	13	2.92	38	38	25	176	82	21	Tiant
Wilbur	Wood	1971	30	334.00	AL	CHA	22	13	1.91	44	42	22	210	62	21	Wood
Wilbur	Wood	1972	31	376.67	AL	CHA	24	17	2.51	49	49	20	193	74	28	Wood
Wilbur	Wood	1973	32	359.33	AL	CHA	24	20	3.46	49	48	21	199	91	25	Wood
Wilbur	Wood	1974	33	320.33	AL	CHA	20	19	3.60	42	42	22	169	80	27	Wood
First	Last	year	Age	Inn	L	team	W	L	ERA	G	GS	CG	SO	BB	HR	Last
	min	1962	22	301.67			16	5	1.12	34	34	12	93	36	11
	max	1980	40	376.67			31	21	4.15	49	49	30	383	202	41

In his two 300 inning seasons Bob Gibson allowed 11 and 12 home runs.