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US area code · Illinois

Area code 779

Where the 779 area code is, its overlay and how to dial a +1 779 number from anywhere.

CoversBelvidere, IllinoisTime zoneCentral (CT)TypeOverlay
Quick answer

The 779 area code is in Belvidere, Illinois, United States (Central (CT)). To call from abroad: +1 779 555-0123. It is an overlay, so all 10 digits are dialled.

StateIllinois
Main areaBelvidere
Time zoneCentral (CT)
TypeOverlay
10-digit dialingRequired
In service since06-Feb-2004

The 779 area code is a geographic North American Numbering Plan (NANP) code covering Belvidere, Illinois. It has been in service since 06-Feb-2004 and sits in the Central (CT) time zone.

Overlay 779 shares its region

Several area codes cover the same geographic area, so two neighbours can have different codes. Because of the overlay, you must dial all 10 digits (area code + number) even for local calls.

779815

How to dial a 779 number

From abroad+1 779 555-0123
Within the US / Canada1 779 555-0123
Locally (same area)779 555-0123

Cities in the 779 area code

A 779 number is usually in one of these places in Illinois — 8 counties.

Belvidere BooneCrystal Lake MchenryDeKalb DekalbFreeport StephensonJoliet WillKankakee KankakeeLoves Park WinnebagoMachesney Park WinnebagoMcHenry ";MchenryRockford WinnebagoRomeoville WillWoodstock Mchenry

Other Illinois area codes

217224309312331447464618630708730773815847861872

Frequently asked questions

Where is the 779 area code?

The 779 area code is in Belvidere, Illinois, United States (Central (CT)).

Is 779 an overlay area code?

Yes. 779 overlays the same region as 815, so callers dial all 10 digits.

Do I have to dial 10 digits for 779?

Yes — dial the area code plus the seven-digit number.

How do I call a 779 number from another country?

Dial your exit code (or +), then 1, then 779, then the number: +1 779 555-0123.

Source: NANPA numbering plan. An area code covers a region, not a precise address — a 779 number does not pinpoint a street or ZIP code.

Missed a call from +1 779?

In the 30 days to September 24, 2026, 203 unwanted calls showing a 779 number were reported to the US Federal Trade Commission, 70% of them recorded messages or robocalls. That puts 779 at #333 of 670 area codes reported.

Other77
Calls pretending to be government, businesses, or family and friends54
Reducing your debt (credit cards, mortgage, student loans)37
Medical & prescriptions8
Before you call back
  • If you do not know anyone in Illinois, do not call back: a genuine caller will leave a message or send a text.
  • Scammers fake the number shown on caller ID, so a 779 number can hide a caller anywhere in the world.
  • Never give a code received by text or a bank detail to an unknown caller. In the US, calls can be reported at reportfraud.ftc.gov.

Who issues +1 779 numbers

Phone companies hold blocks of numbers in each area code. The main holders in 779:

Onvoy, LLC 48New Cingular Wireless PCS, LLC 43Stratus Networks 35T-Mobile USA, Inc. 25Fractel, LLC 24Cellco Partnership Dba Verizon Wireless 22

About 25.4% of the 362 prefixes in use belong to mobile carriers: a 779 number is often a cell phone, and it may have moved to another carrier since.

Sources: FTC Do Not Call reported calls (numbers as reported by consumers, not verified), NANPA central office code assignments.

All US area codes United States +1 Map of area code 779 — cities & rate centres