1850 Counties of Connecticut
| County | Description | Area in sq miles | Courts held at | Pop in 1850 |
| Fairfield | southwest corner, Long Island sound on the south | 630 | Fairfield & Danbury | 59,775 |
| Hartford | northern boundary, crossed by Connecticut & Farmington rivers | 727 | Hartford | 69,966 |
| Litchfield | northwest corner | 885 | Litchfield | 42,253 |
| Middlesex | southern boundary, Long Island sound on south, crossed by Connecticut river | 342 | Middletown | 27,216 |
| New Haven | southern part on Long Island sound | 540 | New Haven | 65,580 |
| New London | southeast corner, crossed by Thamas river, Connecticut river on west | 600 | Norwich & New London | 51,822 |
| Tolland | on north boundary | 337 | Tolland | 20,091 |
| Windham | northeast corner | 620 | Brooklyn | 31,079 |