Area Code Box

Area code 815

Where is area code 815?

Rockford, Joliet and Kankakee, Illinois

Local time: … (Central Time)

StateIllinois
CountryUnited States
Main citiesRockford, Joliet and Kankakee
Time zoneCentral Time
Overlay area codes779
In service since1947
Assigned prefixes786
Dialing format(815) XXX-XXXX · +1 815 XXX XXXX from abroad

Look up a 815 number

Enter a 3-digit area code or a full 10-digit number.

Cities and towns in area code 815

Listed by how many phone prefixes (the 3 digits after the area code) are assigned to each place in 815.

Phone companies in area code 815

The carriers that hold the most 815 prefixes. People can move their number to another carrier, so this shows who first issued a number, not who serves it today.

PrefixesCarrier
157Illinois Bell Tel Co (AT&T)
133Frontier North
76Level 3 Communications
50Verizon Wireless
43Aero North Communications
42New Cingular Wireless PCS (AT&T)
40T-Mobile USA
23United States Cellular (UScellular)

All 786 prefixes in area code 815

Pick the 3 digits after the area code to see that prefix’s city and carrier.

Area codes that overlay 815

Questions

Where is area code 815?
Area code 815 is in Illinois. It serves Rockford, Joliet, Kankakee, Woodstock and DeKalb and 194 other cities and towns.
What time zone is area code 815 in?
Area code 815 uses Central Time.
What area codes overlay 815?
779 serves the same area as 815. New numbers in the area can get any of these codes, which is why local calls need all 10 digits.
Is a call from area code 815 a scam?
The area code alone doesn’t tell you. Most calls from 815 are ordinary local calls, but scammers can fake (“spoof”) any number. If you don’t recognize a 815 number, let it go to voicemail.
When did area code 815 start?
815 went into service in 1947.
Can a 815 number be outside Illinois?
Yes. People keep their numbers when they move and when they switch to mobile or internet phone services, so a 815 caller can be anywhere.

Other area codes in Illinois

Area codeMain cities
217Springfield, Champaign and Decatur
224Northbrook, Arlington Hts and Des Plaines
309Peoria, Bloomington and Rock Island
312Chicgozn01, Wheeling and Oak Brook
331Aurora, Naperville and Downers Grove
447Danville, Springfield and Champaign
464Oak For So, Forest Park and La Grange
618Collinsville, Carbondale and Belleville
630Schaumburg, La Grange and Naperville
708La Grange, Chicago Heights and Oak Forest
730Centralia, Herrin and Belleville
773Harwood Heights, Chicgozn01 and Chicgozn02
847Northbrook, Schaumburg and Arlington Hts
861Peoria, Danvers and Moline
872Chicgozn01, Harwood Heights and Chicgozn04