| <table border="1"> | |
| <tr><td>Batter</td><td>Team</td><td>Age</td><td>Year</td><td>HR</td><td>Reign</td><td>Record breaker</td></tr> | |
| <tr><td>George Hall</td><td>Philadelphia Athletics</td><td>27</td><td>1876</td><td>5</td><td>3 years</td><td>—</td></tr> | |
| <tr><td>Charley Jones</td><td>Boston Red Caps</td><td>29</td><td>1879</td><td>9</td><td>4 years</td><td>6th on July 31 off George Bradley</td></tr> | |
| <tr><td>Harry Stovey</td><td>Philadelphia Athletics</td><td>27</td><td>1883</td><td>14</td><td>1 year</td><td>10th on August 1 off Jack Neagle</td></tr> | |
| <tr><td>Ned Williamson</td><td>Chicago White Stockings</td><td>27</td><td>1884</td><td>27</td><td>35 years</td><td>15th on July 9 off Ed Bagley</td></tr> | |
| <tr><td>Babe Ruth</td><td>Boston Red Sox</td><td>24</td><td>1919</td><td>29</td><td>1 year</td><td>28th on September 24 off Bob Shawkey</td></tr> | |
| <tr><td>Babe Ruth</td><td>New York Yankees</td><td>25</td><td>1920</td><td>54</td><td>1 year</td><td>30th on July 19 off Dickie Kerr</td></tr> | |
| <tr><td>Babe Ruth</td><td>New York Yankees</td><td>26</td><td>1921</td><td>59</td><td>6 years</td><td>55th on September 15 off Bill Bayne</td></tr> | |
| <tr><td>Babe Ruth</td><td>New York Yankees</td><td>32</td><td>1927</td><td>60</td><td>34 years</td><td>60th on September 30 off Tom Zachary</td></tr> | |
| <tr><td>Roger Maris</td><td>New York Yankees</td><td>27</td><td>1961</td><td>61</td><td>37 years</td><td>61st on October 1 off Tracy Stallard</td></tr> | |
| <tr><td>Mark McGwire</td><td>St. Louis Cardinals</td><td>35</td><td>1998</td><td>70</td><td>3 years</td><td>62nd on September 8 off Steve Trachsel</td></tr> | |
| <tr><td>Barry Bonds</td><td>San Francisco Giants</td><td>36</td><td>2001</td><td>73</td><td>17 years</td><td>71st on October 5 off Chan Ho Park</td></tr> | |
| </table> | |