This table ranks all 19 ZIP codes in the Watertown, SD MSA by estimated 2022 population, from highest to lowest.
| # | ZIP Code | Place Name | Population (2022) |
|---|---|---|---|
| 1 | ZIP 57201 | Watertown | 26,119 |
| 2 | ZIP 57212 | Arlington | 2,084 |
| 3 | ZIP 57226 | Clear Lake | 1,820 |
| 4 | ZIP 57234 | Estelline | 1,372 |
| 5 | ZIP 57223 | Castlewood | 1,317 |
| 6 | ZIP 57248 | Lake Norden | 1,083 |
| 7 | ZIP 57221 | Bryant | 1,020 |
| 8 | ZIP 57241 | Hayti | 998 |
| 9 | ZIP 57235 | Florence | 843 |
| 10 | ZIP 57243 | Henry | 569 |
| 11 | ZIP 57263 | South Shore | 477 |
| 12 | ZIP 57242 | Hazel | 415 |
| 13 | ZIP 57238 | Goodwin | 306 |
| 14 | ZIP 57233 | Erwin | 257 |
| 15 | ZIP 57264 | Stockholm | 252 |
| 16 | ZIP 57271 | Vienna | 224 |
| 17 | ZIP 57256 | Ortley | 223 |
| 18 | ZIP 57272 | Wallace | 208 |
| 19 | ZIP 57245 | Kranzburg | 196 |