Alex Rodriguez has launched the most career homers by a player younger than 30, with 409 home runs.

Interpreted as:

most homerun before turning 30 years old by a player

	NAME	HR	G	AB	R	H	2B	3B	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Alex Rodriguez A. Rodriguez	409	1,528	5,958	1,197	1,825	327	24	1,176	695	90	1,201	214	55	6,818	3,427	760	16	59	49	135	.306	.384	.575	.959
2	Ken Griffey Jr. K. Griffey Jr.	398	1,535	5,832	1,063	1,742	320	30	1,152	747	47	984	167	60	6,688	3,316	748	6	56	170	109	.299	.380	.569	.948
3	Jimmie Foxx J. Foxx	379	1,561	5,551	1,216	1,852	313	93	1,347	987	9	859	71		6,608	3,488	785	61				.334	.435	.628	1.063
4	Mickey Mantle M. Mantle	374	1,552	5,518	1,243	1,700	241	66	1,063	1,129	9	1,140	123	33	6,697	3,195	681	13	28	69	58	.308	.425	.579	1.004
5	Eddie Mathews E. Mathews	370	1,482	5,466	1,032	1,548	223	55	993	929	16	888	56	29	6,481	2,991	648	31	39	55	76	.283	.387	.547	.934
6	Albert Pujols A. Pujols	366	1,399	5,146	1,071	1,717	387	14	1,112	811	69	570	61	30	6,082	3,230	767	1	55	198	180	.334	.427	.628	1.055
7	Andruw Jones A. Jones	345	1,625	5,899	973	1,570	309	32	1,032	660	78	1,275	133	53	6,696	2,978	686	6	53	62	146	.266	.345	.505	.850
8	Hank Aaron H. Aaron	342	1,511	5,940	1,078	1,898	321	77	1,121	541	20	607	103	37	6,582	3,399	740	19	62	124	158	.320	.375	.572	.947
9	Mel Ott M. Ott	342	1,739	6,148	1,247	1,939	336	61	1,309	1,040	37	516	60		7,300	3,423	739	75				.315	.417	.557	.974
10	Juan Gonzalez J. Gonzalez	340	1,248	4,831	791	1,421	282	19	1,075	344	48	947	21	15	5,283	2,761	641	2	58	63	129	.294	.343	.572	.915
11	Miguel Cabrera M. Cabrera	323	1,526	5,724	974	1,822	388	14	1,140	715	43	1,116	34	18	6,542	3,207	725	5	55	162	195	.318	.395	.560	.955
12	Adam Dunn A. Dunn	316	1,290	4,417	780	1,101	230	8	777	913	62	1,433	59	20	5,417	2,295	554	2	23	97	65	.249	.383	.520	.903
13	Frank Robinson F. Robinson	314	1,469	5,410	1,025	1,634	311	50	975	677	112	769	158	57	6,265	2,987	675	13	53	125	139	.302	.388	.552	.940
14	Harmon Killebrew H. Killebrew	311	1,179	4,076	681	1,064	140	14	783	682	31	931	6	8	4,820	2,165	465	0	31	47	99	.261	.369	.531	.900
15	Mike Trout M. Trout	310	1,288	4,656	967	1,419	268	49	816	865	86	1,215	203	37	5,659	2,715	627	0	52	109	58	.305	.419	.583	1.002
16	Giancarlo Stanton G. Stanton	308	1,162	4,253	686	1,141	239	11	785	569	44	1,375	41	14	4,896	2,326	558	0	30	79	91	.268	.358	.547	.905
17	Ralph Kiner R. Kiner	294	1,054	3,765	727	1,057	147	31	771	770	19	528	18	2	4,557	2,148	472	3			90	.281	.405	.571	.976
18	Prince Fielder P. Fielder	288	1,357	4,859	754	1,381	276	10	882	748	106	1,000	18	11	5,763	2,541	574	0	50	148	124	.284	.388	.523	.911
19	Johnny Bench J. Bench	287	1,513	5,554	824	1,491	294	21	1,038	655	16	941	55	32	6,304	2,688	602	5	74	109	142	.268	.343	.484	.827
20	Manny Ramirez M. Ramirez	286	1,142	4,112	785	1,290	277	13	964	650	46	943	28	25	4,858	2,451	576	2	48	80	110	.314	.409	.596	1.005
21	Bryce Harper B. Harper	285	1,382	4,927	913	1,379	298	23	817	879	39	1,276	122	43	5,908	2,578	606	12	51	112	106	.280	.390	.523	.913
22	Willie Mays W. Mays	285	1,238	4,746	898	1,506	236	91	828	580	18	518	207	63	5,389	2,779	612	1	44	83	106	.317	.390	.586	.976
23	Babe Ruth B. Ruth	284	1,101	3,567	925	1,251	270	83	877	880	25	600	72		4,515	2,539	637	43				.351	.482	.712	1.194
24	Lou Gehrig L. Gehrig	282	1,288	4,763	1,130	1,632	339	116	1,202	837	23	521	67		5,724	3,049	737	101				.343	.443	.640	1.083
25	Darryl Strawberry D. Strawberry	280	1,248	4,408	748	1,159	209	34	832	655	29	1,085	201	83	5,137	2,276	523	1	44	112	53	.263	.359	.516	.875