Table 3.
Spatial and population characteristics of selected areal units of Connecticut.
| Unit | Places | Area (sq. km) | 1990 Population 20 & Over | Persons 20 + years per sq. mile |
| State | 1 | 12,550 | 2,443,803 | 195 |
| County | 8 | 956 to 2,383 | 72,931 to 635,829 | 54 to 382 |
| Town | 169 | 13 to 160 | 443 to 100,552 | 6 to 2,426 |
| Zip code | 263 | 0.5 to 249 | 19 to 45,623 | 9 to 3,943 |
| Census tract | 834 | <0.01 to 160 | 0 to 7,507 | 6 to 9,077 |
| Block group | 2,905 | <0.01 to 86 | 0 to 5,415 | 0 to 21,333 |
| Census block | 50,569 | Not available | 0 to 2,796 | Not available |