Area Code 630

Illinois

Area code 630 serves Illinois, primarily Aurora, in the Central Time (CT) time zone. It has served the region since 03-Aug-1996.

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 331 (Aurora).

In service since: 03-Aug-1996

Learn more about overlay and split area codes →

Demographics & Economics

Demographic Data Unavailable for Area Code 630

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

Central Time (CT)

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

Central Time (CT)

Prefix Utilization

Geographic Coverage

State

Major Cities

Aurora
Naperville
Bolingbrook
Wheaton
Downers Grove
Plainfield
Elmhurst
Lombard
Romeoville
Bartlett
Carol Stream
Streamwood
Hanover Park
Addison
Oswego
Woodridge
Glendale Heights
St. Charles
Glen Ellyn
Batavia
West Chicago
Westmont
South Elgin
Lisle

and 37 more cities

Area Code 630 geographic coverage map (light mode)

Demographics

Detailed demographic and economic data is not yet available for area code 630.

History

Area code 630 was established in 1996 as a geographic area code. It shares its territory with area code area code 331.

County Coverage

Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 630).

County	Population	Share
DuPage, IL	1,049,109	49.3%
Kane, IL	437,352	20.6%
Will, IL	276,330	13.0%
Kendall, IL	232,928	11.0%
Cook, IL	129,147	6.1%
DeKalb, IL	1,588	0.1%

Area Code 630 Family Tree

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Total Codes

Splits

Overlays

Max Depth

All Descendants

Code ▲	State	Type	In Service	Parent
331	IL	overlay	07-Oct-2007	630

Area code 630 was originally assigned in 03-Aug-1996 to serve IL. Over the years, it has generated 1 descendant area code through a combination of geographic splits and overlays as demand for telephone numbers grew.