16 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Palm City | 1 | 26,666 | 25,038 | 0.89% | 1,924 | 13.86 | CDP |
| Stuart | 2 | 20,689 | 17,541 | 3.14% | 2,908 | 7.12 | City |
| Hobe Sound | 3 | 14,855 | 14,764 | 1.52% | 2,090 | 7.11 | CDP |
| Jupiter Farms | 4 | 13,699 | 13,045 | 0.84% | 908 | 15.08 | CDP |
| Jensen Beach | 5 | 12,800 | 13,592 | 0.57% | 1,836 | 6.97 | CDP |
| Port Salerno | 6 | 11,777 | 12,070 | 0.96% | 3,303 | 3.57 | CDP |
| Indiantown | 7 | 6,879 | 6,569 | 0.91% | 485 | 14.18 | Village |
| Tequesta | 8 | 6,121 | 6,153 | -0.1% | 3,341 | 1.83 | Village |
| Hutchinson Island South | 9 | 3,954 | 5,025 | -2.06% | 918 | 4.31 | CDP |
| North River Shores | 10 | 3,468 | 3,895 | 0.76% | 2,739 | 1.27 | CDP |
| Sewall's Point | 11 | 2,109 | 1,996 | 1.1% | 1,790 | 1.18 | Town |
| Limestone Creek | 12 | 1,572 | 1,704 | 2.48% | 4,020 | 0.39 | CDP |
| Rio | 13 | 1,475 | 705 | 2.36% | 3,902 | 0.38 | CDP |
| Jupiter Island | 14 | 839 | 811 | 0.72% | 310 | 2.71 | Town |
| Ocean Breeze | 15 | 464 | 308 | 7.16% | 2,812 | 0.17 | Town |
| Jupiter Inlet Colony | 16 | 440 | 404 | 1.62% | 2,839 | 0.15 | Town |
Palm City is the largest city in Martin County, with a population of 26,666.
Jupiter Inlet Colony is the smallest city in Martin County.
There are 16 cities in Martin County, Florida.