The municipalities of
Mercer County
| CITY | Est. | Formed from | Previously known as |
| Trenton | 1792 | ||
| TOWNSHIP | |||
| East Windsor | 1797 | ||
| Ewing | 1834 | ||
| Hamilton | 1842 | ||
| Hopewell | 1700 | ||
| Lawrence | 1816 | ||
| Princeton | 1838 | ||
| Washington | 1859 | ||
| West Windsor | 1797 | ||
| BOROUGH | |||
| Hightstown | 1853 | East Windsor | |
| Hopewell | 1891 | Hopewell Twp | |
| Pennington | 1890 | Hopewell | |
| Princeton | 1813 | Princeton Twp |
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