Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — AREA-CODES/IL

Illinois area codes

Illinois has 17 area codes covering 8 areas. In 8 of them several codes overlay the same ground, so a number there can have any of them: 312, 773 and 872 around Chicago; 224 and 847 around Elgin; 779 and 815 around Rockford; 331 and 630 around Aurora; and 4 more below. The newest, 730, came into service in 2023.

Area codes
17
Areas
8
Overlay areas
8
Time zone
Central
Newest
730 (2023)

Somewhere in Illinois now? What area code am I in? answers from your location.

Every Illinois area code

Area codes in Illinois
CodeWhereOverlaysSince
217 Springfield, Decatur, Quincy 447 1947
224 Elgin, Waukegan, Evanston 847 2002
309 Peoria, Bloomington, Moline 861 1957
312 Chicago, Wheeling, Hinsdale 872 1947
331 Aurora, Naperville, Wheaton 630 2007
447 Springfield, Decatur, Quincy 217 2021
464 Cicero, Orland Park, Oak Lawn 708 2022
618 Belleville, O Fallon, Granite City 730 1947
630 Aurora, Naperville, Elgin 331 1996
708 Cicero, Orland Park, Oak Lawn 464 1989
730 Belleville, O Fallon, Granite City 618 2023
773 Chicago 872 1996
779 Joliet, Rockford, Plainfield 815 2007
815 Joliet, Rockford, Plainfield 779 1947
847 Elgin, Waukegan, Evanston 224 1996
861 Peoria, Moline, Rock Island 309 2023
872 Chicago 312, 773 2009

Illinois area codes by area

Codes that overlay one another share one area. The places listed have a telephone rate centre of their own in NANPA's records, largest first; each links to its ZIP codes.

312, 773, 872 — Chicago

872 covers the whole area; 312 and 773 each cover part of it (the table above says which).

3 places:

2 counties:

847, 224 — Elgin

847 (1996) was here first; 224 (2002) overlays it, so a number from anywhere in the area can have any of them.

43 places, the largest 36 here (all of them on 847):

5 counties:

815, 779 — Rockford

815 (1947) was here first; 779 (2007) overlays it, so a number from anywhere in the area can have any of them.

191 places, the largest 36 here (all of them on 815):

9 counties:

630, 331 — Aurora

630 (1996) was here first; 331 (2007) overlays it, so a number from anywhere in the area can have any of them.

32 places:

5 counties:

217, 447 — Springfield

217 (1947) was here first; 447 (2021) overlays it, so a number from anywhere in the area can have any of them.

252 places, the largest 36 here (all of them on 217):

9 counties:

618, 730 — Belleville

618 (1947) was here first; 730 (2023) overlays it, so a number from anywhere in the area can have any of them.

215 places, the largest 36 here (all of them on 618):

9 counties:

708, 464 — Orland Park

708 (1989) was here first; 464 (2022) overlays it, so a number from anywhere in the area can have any of them.

34 places:

3 counties:

309, 861 — Peoria

309 (1957) was here first; 861 (2023) overlays it, so a number from anywhere in the area can have any of them.

163 places, the largest 36 here (all of them on 309):

8 counties:

Area codes of the largest cities in Illinois

Largest cities in Illinois and their area codes
CityArea codesPopulation
Chicago 773, 312, 872 2,711,226
Aurora 630, 331 179,898
Naperville 630, 331 150,692
Joliet 815, 779 150,445
Rockford 815, 779 147,521
Elgin 224, 847, 630 114,934
Springfield 217, 447 113,330
Peoria 309, 861 112,169
Champaign † 217, 447 89,996
Waukegan 224, 847 89,076
Cicero 708, 464 82,797
Bloomington 309 78,907
Schaumburg † 847, 630, 708, 224, 331 76,868
Evanston 847, 224 76,340
Arlington Heights 224, 847 76,005
Decatur 217, 447 69,815
Palatine 847, 224 66,293
Skokie 847, 224 66,219
Des Plaines 224, 847 59,156
Orland Park 708, 464 57,916
Oak Lawn 708, 464 56,861
Berwyn 708, 464 55,595
Mount Prospect † 224, 847 55,472
Tinley Park 708, 464 54,842
Normal † 309 53,569
Wheaton 630, 331 53,557
Oak Park 708 53,292
Hoffman Estates † 847, 224 51,175
Downers Grove 630, 331 50,054
Glenview 224, 847 47,752
Plainfield 815, 779 46,708
Elmhurst 630, 331 45,671
Lombard 630, 331 43,619
Buffalo Grove † 224, 847 42,891
Moline 309, 861 42,197
Belleville 618, 730 41,370
Romeoville † 815, 779 41,152
Crystal Lake 815, 779 40,579
Bartlett 630, 331, 224, 847 40,501
Dekalb 815, 779 40,443

† NANPA lists no rate centre for the town itself; these are the codes of the nearest one. A town on an area-code boundary can differ from its neighbour.

Questions about Illinois area codes

How many area codes does Illinois have?

17: 217, 224, 309, 312, 331, 447, 464, 618, 630, 708, 730, 773, 779, 815, 847, 861 and 872. All of them are in overlay areas, where several codes share the same ground.

What is the newest area code in Illinois?

730, in service since 2023. It overlays 618.

What are the area codes of the largest cities in Illinois?

Chicago: 773, 312 and 872. Aurora: 630 and 331. Naperville: 630 and 331. Joliet: 815 and 779. Rockford: 815 and 779.

What time zone are Illinois area codes in?

Central time.

Every US area code · Illinois ZIP codes

Source: NANPA NPA database and central office code assignments, 2026-10-10. Places are matched to NANPA's rate centres by name; see sources.

Cite this page

zipcodes.pro. “Illinois area codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/area-codes/il

Underlying data is public domain or openly licensed — sources, vintages and licences.