| Year Joined | State Name | Capital City |
| 1787 | Delaware | Dover |
| 1787 | Pennsylvania | Harrisburg |
| 1787 | New Jersey | Trenton |
| 1788 | Georgia | Atlanta |
| 1788 | Connecticut | Hartford |
| 1788 | Massachusetts | Boston |
| 1788 | Maryland | Annapolis |
| 1788 | South Carolina | Columbia |
| 1788 | New Hampshire | Concord |
| 1788 | Virginia | Richmond |
| 1788 | New York | Albany |
| 1789 | North Carolina | Raleigh |
| 1790 | Rhode Island | Providence |
| 1791 | Vermont | Montpelier |
| 1792 | Kentucky | Frankfort |
| 1796 | Tennessee | Nashville |
| 1803 | Ohio | Columbus |
| 1812 | Louisiana | Baton Rouge |
| 1816 | Indiana | Indianapolis |
| 1817 | Mississippi | Jackson |
| 1818 | Illinois | Springfield |
| 1819 | Alabama | Montgomery |
| 1820 | Maine | Augusta |
| 1821 | Missouri | Jefferson City |
| 1836 | Arkansas | Little Rock |
| 1837 | Michigan | Lansing |
| 1845 | Florida | Tallahassee |
| 1845 | Texas | Austin |
| 1846 | Iowa | Des Moines |
| 1848 | Wisconsin | Madison |
| 1850 | California | Sacramento |
| 1858 | Minnesota | St. Paul |
| 1859 | Oregon | Salem |
| 1861 | Kansas | Topeka |
| 1863 | West Virginia | Charleston |
| 1864 | Nevada | Carson City |
| 1867 | Nebraska | Lincoln |
| 1876 | Colorado | Denver |
| 1889 | North Dakota | Bismarck |
| 1889 | South Dakota | Pierre |
| 1889 | Montana | Helena |
| 1889 | Washington | Olympia |
| 1890 | Idaho | Boise |
| 1890 | Wyoming | Cheyenne |
| 1896 | Utah | Salt Lake City |
| 1907 | Oklahoma | Oklahoma City |
| 1912 | New Mexico | Santa Fe |
| 1912 | Arizona | Phoenix |
| 1959 | Alaska | Juneau |
| 1959 | Hawaii | Honolulu |