The municipalities of
Union County
| CITY | Est. | Formed from | Previously known as |
| Elizabeth | 1855 | ||
| Linden | 1924 | ||
| Plainfield | 1869 | ||
| Rahway | 1858 | ||
| Summit | 1899 | ||
| TOWN | |||
| Westfield | 1903 | ||
| TOWNSHIP | |||
| Clark | 1864 | ||
| Cranford | 1871 | ||
| Hillside | 1913 | ||
| New Providence | 1809 | ||
| Scotch Plains | 1878 | ||
| Springfield | 1693 | ||
| Union | 1808 | ||
| BOROUGH | |||
| Fanwood | 1895 | ||
| Garwood | 1903 | ||
| Kenilworth | 1907 | ||
| Mountainside | 1895 | ||
| New Providence | 1899 | New Providence Twp | |
| Roselle | 1894 | ||
| Roselle Park | 1901 |
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