North American Numbers Source-cited · ownership disclosed
Area code
860
In service
United States · since 1995

Connecticut (except southwest)

Area code 860 was created in the August 28, 1995 split of the original 203, serving most of Connecticut outside the southwest. It is now overlaid by 959.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Connecticut (except southwest)
Type
geographic
Status
in service
In service since
1995
Projected exhaust
2091 Q1

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 860 is

Most of Connecticut except the southwest. Hartford, Litchfield (partial), Middlesex, New London, Tolland, and Windham counties, plus portions of New Haven County..

Communities served wholly or partly by 860:

HartfordNorwichGrotonNew LondonManchesterBristolMiddletownNew BritainTorringtonEnfield
B · Relationships

How it relates to other codes

The codes 860 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Split from · 1995 203 Southwestern Connecticut On August 28, 1995 the original statewide 203 was split; 860 was carved out for the rest of the state.
Overlay · 2014 959 Connecticut except southwest (overlay) 959 overlays the same 860 territory, in service August 30, 2014.
Related · 2009 475 Southwestern Connecticut (overlay) Overlay of adjacent 203; not the same territory as 860.
What's changing. Overlaid by 959 since August 30, 2014; ten-digit dialing required.
C · History

How 860 got here

1995-08-28
Connecticut split; area code 860 created for most of the state while 203 retained the southwest.
Source: Wikipedia
1996-10-04
Mandatory dialing of 860 began after a permissive-dialing period.
Source: Wikipedia
2014-08-30
Area code 959 went into service as an overlay of 860.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
799
Prefixes available
1
Thousands-blocks assigned
3,337

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 860 with another code →
Sources
Wikipedia ↗
Area code 860
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.