The municipalities of
Middlesex County
| CITY | Est. | Formed from | Previously known as |
| New Brunswick | 1730 | ||
| Perth Amboy | 1718 | ||
| South Amboy | 1908 | ||
| TOWNSHIP | |||
| Cranbury | 1872 | ||
| East Brunswick | 1860 | Monroe, North Brunswick | |
| Madison | 1869 | ||
| Monroe | 1838 | ||
| North Brunswick | 1779 | ||
| Piscataway | 1693 | ||
| Plainsboro | 1919 | ||
| Raritan | 1870 | ||
| South Brunswick | 1779 | ||
| Woodbridge | 1669 | ||
| BOROUGH | |||
| Carteret | 1906 | ||
| Dunellen | 1887 | ||
| Helmetta | 1888 | ||
| Highland Park | 1905 | ||
| Jamesburg | 1887 | Monroe | |
| Metuchen | 1900 | ||
| Middlesex | 1913 | ||
| Milltown | 1889 | ||
| Sayreville | 1919 | ||
| South Plainfield | 1926 | ||
| South River | 1898 | ||
| Spotswood | 1908 |
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