North American NumbersConnecticut except southwest (overlay)
Area code 959 is an all-services overlay of 860, covering the same territory across most of Connecticut outside the southwest. It went into service August 30, 2014.
Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.
Where 959 is
Same as 860: most of Connecticut except the southwest (Hartford, Middlesex, New London, Tolland, Windham counties, plus parts of Litchfield and New Haven)..
Communities served wholly or partly by 959:
Shares the same geographic footprint as 860.
How it relates to other codes
The codes 959 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?
How 959 got here
How full it is
Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.
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.