Cities in area code 779
Which places use area code 779? 138 rate centers in Illinois, the biggest being Rockford, Joliet, Momence. Data below is NANPA's official prefix-to-rate-center mapping.
By numbering footprint the leading localities are Rockford, Joliet, Momence, Dekalb, Freeport, Kankakee, Woodstock and Frankfort, and 129 smaller communities down to single-prefix localities. Prefix counts track lines in service, so the ranking is a reasonable proxy for where the code's subscribers actually are.
44 of the localities fall within FCC top-100 metropolitan statistical areas; the rest are smaller communities.
138 of these localities are also reachable through other area codes — overlay territory where the same place answers to several codes.
All of the code's territory keeps Central time.
Remember that people keep numbers when they relocate, so a 779 number is a where-it-was-issued fact, not a where-they-are fact.
| Locality (rate center) | Active prefixes | Metro area | All codes serving it |
|---|---|---|---|
| Rockford | 42 | — | 779, 815 |
| Joliet | 25 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Momence | 18 | — | 779, 815 |
| Dekalb | 15 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Freeport | 12 | — | 779, 815 |
| Kankakee | 9 | — | 779, 815 |
| Woodstock | 9 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Frankfort | 7 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Plainfield | 6 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| McHenry | 6 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Sterling | 6 | — | 779, 815 |
| Forrest | 6 | — | 779, 815 |
| Crystal Lake | 5 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| South Beloit | 5 | — | 779, 815 |
| La Salle | 4 | — | 779, 815 |
| Sandwich | 4 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Dixon | 4 | — | 779, 815 |
| Galena | 3 | — | 779, 815 |
| Oglesby | 3 | — | 779, 815 |
| Braidwood | 3 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Sycamore | 3 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Wilmington | 3 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Streator | 3 | — | 779, 815 |
| Dwight | 3 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| New Lenox | 3 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Pontiac | 3 | — | 779, 815 |
| Belvidere | 3 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Marengo | 3 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Verona | 2 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Watseka | 2 | — | 779, 815 |
| Onarga | 2 | — | 779, 815 |
| Mazon | 2 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Depue | 2 | — | 779, 815 |
| Crescent City | 2 | — | 779, 815 |
| Princeton | 2 | — | 779, 815 |
| Morris | 2 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Rochelle | 2 | — | 779, 815 |
| Manteno | 2 | — | 779, 815 |
| Fairbury | 2 | — | 779, 815 |
| Lanark | 2 | — | 779, 815 |
| Wonder Lake | 2 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| New Milford | 2 | — | 779, 815 |
| Spring Valley | 2 | — | 779, 815 |
| Harvard | 2 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Lockport | 2 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Cissna Park | 2 | — | 779, 815 |
| Tonica | 1 | — | 779, 815 |
| Polo | 1 | — | 779, 815 |
| Herscher | 1 | — | 779, 815 |
| Saint Anne | 1 | — | 779, 815 |
| Danforth | 1 | — | 779, 815 |
| Flanagan | 1 | — | 779, 815 |
| Grand Ridge | 1 | — | 779, 815 |
| Donovan | 1 | — | 779, 815 |
| Toluca | 1 | — | 779, 815 |
| Martinton | 1 | — | 779, 815 |
| Richmond | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Sheldon | 1 | — | 779, 815 |
| Sheridan | 1 | — | 779, 815 |
| Spring Grove | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Union | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Beaverville | 1 | — | 779, 815 |
| Milford | 1 | — | 779, 815 |
| Harding | 1 | — | 779, 815 |
| Long Point | 1 | — | 779, 815 |
| Wenona | 1 | — | 779, 815 |
| Rutland | 1 | — | 779, 815 |
| Reddick | 1 | (Chicago, IL PMSA) | 779, 815 |
| Lostant | 1 | — | 779, 815 |
| Chatsworth | 1 | — | 779, 815 |
| South Sharon | 1 | — | 779, 815 |
| Cherry Valley | 1 | — | 779, 815 |
| Rock Cut | 1 | — | 779, 815 |
| Roscoe | 1 | — | 779, 815 |
| Creston | 1 | — | 779, 815 |
| Kirkland | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Malta | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Maple Park | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Monroe Center | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Shabbona | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Thomas | 1 | — | 779, 815 |
| Franklin Grove | 1 | — | 779, 815 |
| Warren | 1 | — | 779, 815 |
| Hanover | 1 | — | 779, 815 |
| Mendota | 1 | — | 779, 815 |
| Durand | 1 | — | 779, 815 |
| Woodland | 1 | — | 779, 815 |
| Coal City | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| German Valley | 1 | — | 779, 815 |
| Seward | 1 | — | 779, 815 |
| Byron | 1 | — | 779, 815 |
| Capron | 1 | — | 779, 815 |
| Winslow | 1 | — | 779, 815 |
| Waterman | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Forreston | 1 | — | 779, 815 |
| Davis | 1 | — | 779, 815 |
| Harmon | 1 | — | 779, 815 |
| Leaf River | 1 | — | 779, 815 |
| Grant Park | 1 | — | 779, 815 |
| Genoa | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Poplar Grove | 1 | — | 779, 815 |
| Garden Prairie | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Wellington | 1 | — | 779, 815 |
| Minooka | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Cabery | 1 | — | 779, 815 |
| Kinsman | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Elizabeth | 1 | — | 779, 815 |
| Stockton | 1 | — | 779, 815 |
| Manhattan | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Sheffield | 1 | — | 779, 815 |
| Grand Detour | 1 | — | 779, 815 |
| Emington | 1 | — | 779, 815 |
| Graymont | 1 | — | 779, 815 |
| Mount Morris | 1 | — | 779, 815 |
| Kempton | 1 | — | 779, 815 |
| Paw Paw | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Ohio | 1 | — | 779, 815 |
| Magnolia | 1 | — | 779, 815 |
| Ashton | 1 | — | 779, 815 |
| Lena | 1 | — | 779, 815 |
| Steward | 1 | — | 779, 815 |
| Winnebago | 1 | — | 779, 815 |
| Chadwick | 1 | — | 779, 815 |
| Stockland | 1 | — | 779, 815 |
| Pecatonica | 1 | — | 779, 815 |
| Rockton | 1 | — | 779, 815 |
| Coleta | 1 | — | 779, 815 |
| Fulton | 1 | — | 779, 815 |
| Cedar Point | 1 | — | 779, 815 |
| Elwood | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Lisbon | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Hooppole | 1 | — | 779, 815 |
| Hinckley | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Granville | 1 | — | 779, 815 |
| Piper City | 1 | — | 779, 815 |
| Leland | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Plattville | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Newark | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
FAQ
What is the biggest city in area code 779?
Rockford holds the most active prefixes (42), making it the code's largest numbering locality.
How many places does 779 cover?
138 rate centers in Illinois hold active 779 prefixes, from Rockford down to communities with a single prefix.
Does a 779 number guarantee the caller lives in one of these places?
No — the tables show where number blocks were issued. Porting and VoIP let people keep or acquire numbers anywhere.