| Active Prefix | Primary City |
|---|---|
| 959-200 | Hartford, CT |
| 959-202 | Torrington, CT |
| 959-209 | Watertown, CT |
| 959-222 | New Britain, CT |
| 959-230 | Hartford, CT |
| 959-242 | Norwich, CT |
| 959-265 | Essex, CT |
| 959-282 | Hartford, CT |
| 959-299 | Hartford, CT |
| 959-333 | Hartford, CT |
| 959-335 | Norfolk, CT |
| 959-444 | Willimantic, CT |
| 959-777 | Hartford, CT |
| 959-888 | Hartford, CT |
| 959-929 | Willimantic, CT |
| 959-999 | Hartford, CT |