Area Code 610
Pennsylvania
Area code 610 serves Pennsylvania, primarily Allentown, in the Eastern Time (ET) time zone. It has served the region since 08-Jan-1994.
Overlay Area Code
This area code is part of an overlay region, meaning the same geographic area is served by multiple area codes. Overlay codes were introduced to meet growing demand for phone numbers without requiring existing customers to change their numbers.
This area code shares its geographic region with: area code 484 (Allentown).
In service since: 08-Jan-1994
Demographics & Economics
Demographic Data Unavailable for Area Code 610
County-level demographic data is not available for this area code because NPA boundary polygons are not publicly distributed by NANPA. We use geographic boundary data from the Colorado Open Data Portal to map area codes to counties, which currently covers 194 of 376 geographic area codes.
Demographic statistics (population, income, education, poverty) require county-level aggregations from Census ACS data. Without a county mapping, these aggregations cannot be computed. We are actively seeking additional data sources to improve coverage.
Statistics are population-weighted aggregations from Census ACS 5-year estimates where county boundary data is available.See Sources for details.
Time Zone
- Eastern Time (ET)
NANPA Relief Status
According to the latest NANPA analysis (July 2026), this area code is not currently listed as exhausting within the next 36 months. No relief planning is in progress for this NPA.
Source: NANPA NPA Relief Planning Reports · See all relief planning statuses
Current Time
Prefix Utilization
Geographic Coverage
State
PA
Major Cities
- Allentown
- Reading
- Bethlehem
- Norristown
- Chester
- Drexel Hill
- Easton
- King of Prussia
- Pottstown
- West Chester
- Phoenixville
- Fullerton
- Ardmore
- Coatesville
- Yeadon
- Emmaus
- Wyomissing
- Lansdowne
- Broomall
- Darby
- Northampton
- Woodlyn
- Bala Cynwyd
- Middletown
and 249 more cities
Demographics
Detailed demographic and economic data is not yet available for area code 610.
History
Area code 610 was established in 1994 as a geographic area code. It shares its territory with area codes area code 484 and area code 835.
County Coverage
Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 610).
| County | Population | Share |
|---|---|---|
| Delaware, PA | 704,116 | 20.0% |
| Chester, PA | 624,760 | 17.8% |
| Montgomery, PA | 570,251 | 16.2% |
| Berks, PA | 541,658 | 15.4% |
| Lehigh, PA | 484,196 | 13.8% |
| Northampton, PA | 365,559 | 10.4% |
| Bucks, PA | 82,166 | 2.3% |
| Lancaster, PA | 62,510 | 1.8% |
| Carbon, PA | 40,938 | 1.2% |
| Monroe, PA | 33,104 | 0.9% |
| Lebanon, PA | 4,578 | 0.1% |
Area Code 610 Family Tree
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All Descendants
Area code 610 was originally assigned in 08-Jan-1994 to serve PA. Over the years, it has generated 2 descendant area codes through a combination of geographic splits and overlays as demand for telephone numbers grew.
Call Context
This area code covers a geographic region across PA, including Allentown and surrounding communities.
Nearby Area Codes
Area codes geographically closest to 610.
Other Area Codes in Pennsylvania
Area codes that also serve Pennsylvania, linked for easy comparison.