North American NumbersAllentown/Reading/Western Suburbs
610 was placed in service in 1994 as a split from 215, covering the Lehigh Valley, Reading, and Philadelphia's western and southern suburbs; it is overlaid by 484 and 835.
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 610 is
Eastern/southeastern Pennsylvania outside the city of Philadelphia.
Communities served wholly or partly by 610:
Covers all/parts of Berks, Bucks, Carbon, Chester, Delaware, Lancaster, Lebanon, Lehigh, Monroe, Montgomery, Northampton, and Schuylkill counties.
How it relates to other codes
The codes 610 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 610 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.