The municipalities of
Somerset County
| TOWN | Est. | Formed from | Previously known as | |
| East Millstone | 1873 | Franklin | ||
| Raritan | 1868 | Bridgewater | ||
| TOWNSHIP | ||||
| Bedminster | 1749 | |||
| Bernards | 1760 | |||
| Branchburg | 1845 | |||
| Bridgewater | 1749 | |||
| Franklin | 1735 | (Estering Precinct) | ||
| Green Brook | ||||
| Hillsborough | 1771 | |||
| Montgomery | 1772 | |||
| Warren | 1806 | |||
| BOROUGH | ||||
| Bernardsville | 1924 | |||
| Bound Brook | 1891 | Bridgewater | ||
| Far Hills | 1921 | |||
| Manville | 1929 | Hillsborough | ||
| Millstone | 1894 | |||
| North Plainfield | 1872 | |||
| Peapack-Gladstone | 1912 | |||
| Rocky Hill | 1889 | Montgomery | ||
| Somerville | 1863 | |||
| South Bound Brook | 1907 | |||
| Watchung | 1926 |
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