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US area code · Illinois

779 area code

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.

Number holders in area code 779

Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 362 prefixes are in use in 779, shared by 46 companies. The largest holders:

CompanyPrefixesShare
Onvoy, LLC4813%
New Cingular Wireless PCS, LLC4312%
Stratus Networks3510%
T-Mobile USA, Inc.257%
Fractel, LLC247%
Cellco Partnership Dba Verizon Wireless226%

Source: NANPA central office code assignments. A number keeps its original prefix when it is ported to another carrier.

Complaints about 779 numbers

Reports to the FTC, last 30 days
203
Recorded messages or robocalls
70%
Rank among area codes
#333 of 670
Most reported subjects
Other (77)
Calls pretending to be government, businesses, or family and friends (54)
Reducing your debt (credit cards, mortgage, student loans) (37)

Period Aug 26 – Sep 24, 2026. These are the numbers shown on the caller ID of the reported calls; many are spoofed and do not belong to the real caller.

Source: US Federal Trade Commission, Do Not Call reported calls data (daily files).

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

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