🇺🇸 United States · Illinois

Area code 815

Area code 815 is a telephone area code in Illinois, United States, covering Rockford, Crystal Lake, Plainfield, Joliet, McHenry, DeKalb and more. Local time is UTC−6 (UTC−5 in summer). Numbers look like (815) 234-5678, or +1 815 234 5678 from abroad.

State: Illinois
Time zone: Chicago UTC−6 (UTC−5 in summer)
Local time now: –
Dial from abroad: +1 815

Places in area code 815

Cities and towns with telephone exchanges in the 815 area code, most exchanges first.

Rockford
Crystal Lake
Plainfield
Joliet
McHenry
DeKalb
Woodstock
Freeport
Lockport
Peru
Dixon
Romeoville
Morris
Ottawa
New Lenox
Frankfort
Sterling
Princeton
Mendota
Belvidere
Rochelle
Wonder Lake
Spring Valley
Streator

How to dial area code 815

Calling from	You dial
Inside the 815 area	815 234 5678 (10 digits)
Elsewhere in the US & Canada	1 815 234 5678
Any mobile phone, anywhere	+1 815 234 5678
UK, Europe, India and most countries	00 1 815 234 5678
Australia	0011 1 815 234 5678

Other area codes in Illinois

217 Springfield, Champaign 224 North Chicago, Schaumburg 309 Peoria, Bloomington 312 Chicago 331 Illinois 447 Illinois 464 Illinois 618 Belleville, Granite City 630 Aurora, Naperville 708 Oak Park, Orland Park 730 Illinois 773 Chicago 779 Rockford 847 Schaumburg, Elgin 872 Chicago

Area code 815: FAQ

Where is area code 815?

Area code 815 is in Illinois, United States and serves Rockford, Crystal Lake, Plainfield, Joliet, McHenry, DeKalb. and other places

What time zone is area code 815 in?

Area code 815 is in the America/Chicago time zone (UTC−6 (UTC−5 in summer)).

How do I call a 815 number from outside the US and Canada?

Dial your exit code (00 in most countries, or + on a mobile), then 1, then 815 and the seven-digit number. Example: +1 815 234 5678.

Is a call from area code 815 a scam?

Area code 815 is a regular North American area code, but caller ID can be spoofed: scammers often show local-looking numbers. Do not call back unknown numbers that ask for money or personal data, and check the number with the phone number validator to see whether it is valid and whether it is a mobile, landline or VoIP number.

Phone number API

Check 815 numbers in your app

numlookupapi checks any phone number worldwide in one request and returns validity, line type, carrier, location and every standard format as JSON.

Read the documentation

100 free requests every month. No credit card required.

GET https://api.numlookupapi.com/v1/validate/+18152345678

{
  "valid": true,
  "number": "12069220880",
  "local_format": "2069220880",
  "international_format": "+12069220880",
  "country_prefix": "+1",
  "country_code": "US",
  "country_name": "United States of America",
  "location": "Seattle",
  "line_type": "landline",
  "e164_format": "+12069220880",
  "national_format": "(206) 922-0880"
}