Area Code 847

Illinois

Area code 847 serves Illinois, primarily Chicago, in the Central Time (CT) time zone. It has served the region since 20-Jan-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 224 (Chicago).

In service since: 20-Jan-1996

Learn more about overlay and split area codes →

Demographics & Economics

Demographic Data Unavailable for Area Code 847

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

Chicago
Elgin
Waukegan
Schaumburg
Evanston
Arlington Heights
Palatine
Skokie
Des Plaines
Mount Prospect
Hoffman Estates
Glenview
Buffalo Grove
Bartlett
Carol Stream
Park Ridge
Streamwood
Wheeling
Carpentersville
Hanover Park
Northbrook
Glendale Heights
Elk Grove Village
Mundelein

and 96 more cities

Area Code 847 geographic coverage map (light mode)

Demographics

Detailed demographic and economic data is not yet available for area code 847.

History

Area code 847 was established in 1996 as a geographic area code. It shares its territory with area code area code 224.

County Coverage

Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 847).

County	Population	Share
Cook, IL	1,371,335	45.7%
Lake, IL	852,115	28.4%
Kane, IL	383,282	12.8%
McHenry, IL	209,509	7.0%
DuPage, IL	161,202	5.4%
DeKalb, IL	21,844	0.7%

Area Code 847 Family Tree

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Total Codes

Splits

Overlays

Max Depth

All Descendants

Code ▲	State	Type	In Service	Parent
224	IL	overlay	05-Jan-2002	847

Area code 847 was originally assigned in 20-Jan-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.