There are 18 cities in Southeastern Connecticut Planning Region, Connecticut.
Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Population | 2020 Population | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Groton | 1 | 37,790 | 38,343 | -0.23% | 1,215 | 31.1 | Township |
| Windham | 2 | 23,774 | 23,857 | -0.25% | 886 | 26.8 | Township |
| Waterford | 3 | 20,093 | 19,581 | 1.33% | 611 | 32.9 | Township |
| East Lyme | 4 | 19,116 | 18,443 | 0.99% | 562 | 34.0 | Township |
| Stonington | 5 | 18,430 | 18,318 | -0.01% | 477 | 38.6 | Township |
| Montville | 6 | 17,783 | 18,069 | -0.17% | 425 | 41.8 | Township |
| Ledyard | 7 | 15,499 | 15,388 | 0.26% | 406 | 38.2 | Township |
| Colchester | 8 | 15,488 | 15,485 | -0.1% | 316 | 48.9 | Township |
| Griswold | 9 | 11,764 | 11,421 | 1.2% | 339 | 34.7 | Township |
| Lebanon | 10 | 7,098 | 7,127 | -0.14% | 131 | 54.1 | Township |
| North Stonington | 11 | 5,172 | 5,141 | 0.14% | 95 | 54.2 | Township |
| Preston | 12 | 4,831 | 4,788 | 0.04% | 157 | 30.8 | Township |
| Salem | 13 | 4,322 | 4,202 | 0.07% | 149 | 28.9 | Township |
| Lisbon | 14 | 4,224 | 4,188 | -0.1% | 259 | 16.3 | Township |
| Sprague | 15 | 2,928 | 2,967 | -0.41% | 221 | 13.2 | Township |
| Bozrah | 16 | 2,411 | 2,421 | -0.04% | 121 | 20.0 | Township |
| Franklin | 17 | 1,906 | 1,857 | 0.79% | 97 | 19.7 | Township |
| 18 |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Groton is the largest city in Southeastern Connecticut Planning Region.
undefined is the smallest city in Southeastern Connecticut Planning Region.
There are 18 cities in Southeastern Connecticut Planning Region, Connecticut.