20 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 2852 | North Kingstown | 23,382 |
| 2879 | Wakefield | 22,369 |
| 2891 | Westerly | 22,026 |
| 2882 | Narragansett | 13,238 |
| 2813 | Charlestown | 7,998 |
| 2881 | Kingston | 7,177 |
| 2874 | Saunderstown | 6,376 |
| 2822 | Exeter | 6,241 |
| 2892 | West Kingston | 5,920 |
| 2832 | Hope Valley | 4,887 |
| 2804 | Ashaway | 2,560 |
| 2808 | Bradford | 2,328 |
| 2898 | Wyoming | 1,857 |
| 2812 | Carolina | 1,038 |
| 2807 | Block Island | 962 |
| 2833 | Hopkinton | 670 |
| 2894 | Wood River Junction | 609 |
| 2875 | Shannock | 176 |
| 2873 | Rockville | 97 |
| 2836 | Kenyon | 87 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 20 ZCTAs in Washington County, Rhode Island (US Census).