Connecticut area codes
Connecticut has 4 active area codes. The original 1947 code was 203. The newest is 959 (2014).
The busiest codes by active prefixes are 860 (Hartford), 203 (New Haven), 475 (New Haven), 959 (Hartford).
Overlay territory: 203/475, 860/959 — same geography, several codes, ten-digit local dialing.
Recent numbering history: 959 arrived in 2014 — an overlay added as existing codes approached exhaust.
Time zone is uniform across the state's codes: Eastern.
203 has served New Haven since 1947, carries 778 active prefixes across 32 rate centers, split among 22 carriers. 473 of its prefixes are pooled — shared between carriers in thousands-number blocks. It is the oldest area code in Connecticut, in service since 1947. NANPA projects its capacity to last until 4Q 2055 — no relief needed for decades. Local dialing is ten digits.
475 has served New Haven since 2009, carries 282 active prefixes across 32 rate centers, split among 31 carriers. 282 of its prefixes are pooled — shared between carriers in thousands-number blocks. NANPA projects its capacity to last until 4Q 2055 — no relief needed for decades. It was created from 203. Local dialing is ten digits.
860, in service since 1995, anchors Hartford, carries 781 active prefixes across 57 rate centers, split among 22 carriers. 525 of its prefixes are pooled — shared between carriers in thousands-number blocks. It is covers more rate centers (57) than any other Connecticut area code. NANPA projects its capacity to last until 1Q 2091 — no relief needed for decades. It was created from 203. Local dialing is ten digits.
959 has served Hartford since 2014, carries 157 active prefixes across 52 rate centers, split among 32 carriers. 157 of its prefixes are pooled — shared between carriers in thousands-number blocks. NANPA projects its capacity to last until 1Q 2091 — no relief needed for decades. It was created from 860. Local dialing is ten digits.
Numbers in the toll-free 8YY family are absent here by design: they carry no state assignment and answer anywhere in the US, Canada and the Caribbean.
Use the per-code pages to go deeper — coverage by locality, full prefix tables for the most-searched codes, and NANPA's capacity forecasts for each.
| Code | Major area | In service | Overlay complex | Prefixes |
|---|---|---|---|---|
| 203 | New Haven | 1947 | 203/475 | 778 |
| 475 | New Haven | 2009 | 203/475 | 282 |
| 860 | Hartford | 1995 | 860/959 | 781 |
| 959 | Hartford | 2014 | 860/959 | 157 |
FAQ
How many area codes does Connecticut have?
4 geographic area codes are currently in service: 203, 475, 860, 959.
What was Connecticut's first area code?
203, in service since 1947.
Will Connecticut get a new area code soon?
Not soon. The earliest exhaust forecast in the state is 203 at 4Q 2055, so current codes have ample capacity.
Which time zone are Connecticut numbers in?
All Connecticut area codes are in the Eastern time zone.