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815 Area Code

Area code 815 serves Joliet, Rockford, Plainfield, Crystal Lake, DeKalb and nearby communities in Illinois. It has been in service since January 1, 1947.

StateIllinois
Time zoneCentral
Local time now…
Prefixes in use786
Overlay with779
Projected to run out2044
JolietRockfordPlainfieldCrystal LakeDeKalbMcHenryNew LenoxLockportWoodstockBelvidereHomer GlenLoves ParkKankakeeFreeportMachesney ParkFrankfortSycamoreOttawaShorewoodBourbonnaisBradleyMorrisDixonChannahonSterlingMinookaStreatorRoscoeManhattanPontiacPeruHarvardRochelleLaSalleMantenoRock FallsSouth BeloitRocktonMarengoPrincetonSandwichMendotaLakemoorJohnsburgBraidwoodCoal CityWilmingtonWonder LakeGenoaSpring GroveCandlewick LakeSpring ValleyLake HolidayPoplar GroveJolietRockfordDeKalbMcHenry
Cities and towns served by area code 815

Who issues 815 numbers

Mobile 20%VoIP and cable 18%Landline 62%

Share of the 786 prefixes (the three digits after 815) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
Frontier160
AT&T (Illinois Bell)157
Lumen (Level 3)76
Verizon Wireless50
Aero North Communications43
AT&T Mobility42
T-Mobile40
UScellular23

Cities and towns in area code 815

CityPopulationOther area codes
Joliet152,241779
Rockford147,384779
Plainfield50,043779
Crystal Lake42,288779
DeKalb40,467779
McHenry29,217779
New Lenox28,893779
Lockport27,822779
Woodstock25,740779
Belvidere25,462779
Homer Glen24,873779
Loves Park23,712779
Kankakee23,400779
Freeport23,202779
Machesney Park22,805779
Frankfort21,365779
Sycamore19,083779
Ottawa18,684
Shorewood18,536779
Bourbonnais17,658779
Bradley15,214779
Morris14,669779
Dixon14,582779
Channahon14,530779
Sterling14,394779
Minooka12,899779
Streator12,190779
Roscoe11,034779
Manhattan10,943779
Pontiac10,806779
Peru9,780779
Harvard9,504779
Rochelle9,498779
LaSalle9,388779
Manteno9,201779
Rock Falls8,521779
South Beloit7,996779
Rockton7,870779
Marengo7,737779
Princeton7,674779

Showing the 40 largest of 54 places with 5,000+ residents.

Got a call from 815?

A 815 number was originally issued in Illinois, but that does not prove the caller is there. 18% of 815 prefixes belong to VoIP and cable providers, whose numbers can be bought online and used from anywhere. Caller ID can also be spoofed, so treat urgent requests for money, codes or passwords from any area code with suspicion, and call back on a number you already know.

All 786 prefixes in area code 815

Format: (815) XXX-YYYY. Carrier is the company the block was originally assigned to; numbers may since have been ported to another carrier.

Questions about area code 815

Where is area code 815?
Area code 815 is in Illinois. It covers Joliet, Rockford, Plainfield, Crystal Lake, DeKalb, McHenry and 48 more cities and towns.
What time zone is area code 815?
Area code 815 is in the Central time zone.
Is 815 a toll-free number?
No. 815 is a geographic area code in Illinois. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Why does 815 share its area with 779?
779 and 815 form an overlay: they cover the same territory, so new numbers there can get any of these codes, and local calls need all 10 digits.
Will area code 815 run out of numbers?
NANPA's latest forecast projects the 779/815 overlay to exhaust in the first quarter of 2044. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in Illinois