Cities in area code 815
Area code 815 serves 200 localities in Illinois, led by Rockford, Joliet, Kankakee. The table lists every rate center — the billing locality each prefix is anchored to — with its share of the code's 786 active prefixes.
By numbering footprint the leading localities are Rockford, Joliet, Kankakee, Woodstock, Dekalb, Lockport, Freeport and McHenry, and 191 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.
Metropolitan coverage: 52 rate centers belong to FCC top-100 metro areas.
Overlap note: 140 localities are shared with other area codes, so a neighbor's number may differ in its first three digits.
Clock-wise the coverage is Central.
A caller's real location can differ: numbers port between carriers and follow their owners when they move. Use the prefix tables to see where a specific number block was issued.
Showing 200 of 200
| Locality (rate center) | Active prefixes | Metro area | All codes serving it |
|---|---|---|---|
| Rockford | 89 | — | 779, 815 |
| Joliet | 62 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Kankakee | 33 | — | 779, 815 |
| Woodstock | 28 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Dekalb | 24 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Lockport | 18 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Freeport | 18 | — | 779, 815 |
| McHenry | 18 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Crystal Lake | 16 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Sterling | 15 | — | 779, 815 |
| Plainfield | 15 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Morris | 12 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Ottawa | 11 | — | 815 |
| La Salle | 9 | — | 779, 815 |
| Oglesby | 9 | — | 779, 815 |
| Dixon | 9 | — | 779, 815 |
| Princeton | 9 | — | 779, 815 |
| Minooka | 8 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| New Lenox | 7 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Streator | 7 | — | 779, 815 |
| Belvidere | 7 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Gardner | 6 | Chicago-Naperville-Elgin, IL-IN | 815 |
| Frankfort | 6 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| La Grange | 6 | Chicago-Naperville-Elgin, IL-IN | 312, 464, 630, 708, 815, 847 |
| Crescent City | 6 | — | 779, 815 |
| Momence | 6 | — | 779, 815 |
| Coal City | 5 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Utica | 5 | — | 815 |
| Manhattan | 5 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Pontiac | 5 | — | 779, 815 |
| Marseilles | 5 | — | 815 |
| Mendota | 5 | — | 779, 815 |
| Rochelle | 5 | — | 779, 815 |
| Sycamore | 5 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Galena | 4 | — | 779, 815 |
| Seneca | 4 | Chicago-Naperville-Elgin, IL-IN | 815 |
| Elwood | 4 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Morrison | 4 | — | 815 |
| Watseka | 4 | — | 779, 815 |
| Grant Park | 4 | — | 779, 815 |
| Harvard | 4 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Milledgeville | 3 | — | 815 |
| Byron | 3 | — | 779, 815 |
| Earlville | 3 | Chicago-Naperville-Elgin, IL-IN | 815 |
| Gilman | 3 | — | 815 |
| Roscoe | 3 | — | 779, 815 |
| Savanna | 3 | — | 815 |
| Shannon | 3 | — | 815 |
| South Beloit | 3 | — | 779, 815 |
| Braidwood | 3 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Pearl City | 3 | — | 815 |
| Apple River | 3 | — | 815 |
| Lanark | 3 | — | 779, 815 |
| Somonauk | 3 | Chicago-Naperville-Elgin, IL-IN | 815 |
| Prophetstown | 3 | — | 815 |
| Marengo | 3 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Oregon | 3 | — | 815 |
| Rockton | 3 | — | 779, 815 |
| Chadwick | 3 | — | 779, 815 |
| Elizabeth | 3 | — | 779, 815 |
| New Milford | 3 | — | 779, 815 |
| Sheridan | 2 | — | 779, 815 |
| Fulton | 2 | — | 779, 815 |
| Pecatonica | 2 | — | 779, 815 |
| Rock Cut | 2 | — | 779, 815 |
| Mount Carroll | 2 | — | 815 |
| Seward | 2 | — | 779, 815 |
| Durand | 2 | — | 779, 815 |
| Thomson | 2 | — | 815 |
| Waterman | 2 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Cherry Valley | 2 | — | 779, 815 |
| Winnebago | 2 | — | 779, 815 |
| La Moille | 2 | — | 815 |
| Franklin Grove | 2 | — | 779, 815 |
| Cornell | 2 | — | 815 |
| Harmon | 2 | — | 779, 815 |
| Sublette | 2 | — | 815 |
| German Valley | 2 | — | 779, 815 |
| Winslow | 2 | — | 779, 815 |
| Lena | 2 | — | 779, 815 |
| Dwight | 2 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Herscher | 2 | — | 779, 815 |
| Saint Anne | 2 | — | 779, 815 |
| Tampico | 2 | — | 815 |
| Manlius | 2 | — | 815 |
| Dakota | 2 | — | 815 |
| Ashton | 2 | — | 779, 815 |
| Manteno | 2 | — | 779, 815 |
| Plattville | 2 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Wilmington | 2 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Union | 2 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| East Dubuque | 2 | — | 815 |
| Chenoa | 2 | — | 815 |
| Cedarville | 2 | — | 815 |
| Sandwich | 2 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Polo | 2 | — | 779, 815 |
| Spring Grove | 2 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Hanover | 2 | — | 779, 815 |
| Massbach | 2 | — | 815 |
| Hennepin | 2 | — | 815 |
| Shirland | 2 | — | 815 |
| Stillman Valley | 2 | — | 815 |
| Cullom | 2 | — | 815 |
| Hebron | 2 | Chicago-Naperville-Elgin, IL-IN | 815 |
| Wonder Lake | 2 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Newark | 2 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Bureau | 2 | — | 815 |
| Spring Valley | 2 | — | 779, 815 |
| Richmond | 2 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Clifton | 2 | — | 815 |
| Chebanse | 2 | — | 815 |
| Ashkum | 2 | — | 815 |
| Saunemin | 2 | — | 815 |
| Mount Morris | 2 | — | 779, 815 |
| Leaf River | 2 | — | 779, 815 |
| Warren | 2 | — | 779, 815 |
| Poplar Grove | 2 | — | 779, 815 |
| Lyndon | 2 | — | 815 |
| Orangeville | 2 | — | 815 |
| Ladd | 2 | — | 815 |
| Davis | 2 | — | 779, 815 |
| McConnell | 2 | — | 815 |
| Forreston | 2 | — | 779, 815 |
| Stockton | 2 | — | 779, 815 |
| Scales Mound | 2 | — | 815 |
| Amboy | 2 | — | 815 |
| Northbrook | 1 | Chicago-Naperville-Elgin, IL-IN | 224, 312, 630, 708, 815, 847 |
| Grand Ridge | 1 | — | 779, 815 |
| Nelson | 1 | — | 815 |
| Kempton | 1 | — | 779, 815 |
| Stelle | 1 | — | 815 |
| Onarga | 1 | — | 779, 815 |
| Danforth | 1 | — | 779, 815 |
| Hinckley | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Verona | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| South Bergen | 1 | — | 815 |
| Coleta | 1 | — | 779, 815 |
| Granville | 1 | — | 779, 815 |
| Reddick | 1 | (Chicago, IL PMSA) | 779, 815 |
| Lostant | 1 | — | 779, 815 |
| Ohio | 1 | — | 779, 815 |
| Walnut | 1 | — | 815 |
| Creston | 1 | — | 779, 815 |
| Kinsman | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Monroe Center | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Steward | 1 | — | 779, 815 |
| Martinton | 1 | — | 779, 815 |
| Sheldon | 1 | — | 779, 815 |
| Beaverville | 1 | — | 779, 815 |
| Putnam | 1 | — | 815 |
| Tonica | 1 | — | 779, 815 |
| Cedar Point | 1 | — | 779, 815 |
| Depue | 1 | — | 779, 815 |
| Mazon | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Toluca | 1 | — | 779, 815 |
| Sheffield | 1 | — | 779, 815 |
| Cissna Park | 1 | — | 779, 815 |
| Woodland | 1 | — | 779, 815 |
| Donovan | 1 | — | 779, 815 |
| Leland | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Compton | 1 | — | 815 |
| Kirkland | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Thomas | 1 | — | 779, 815 |
| Campus | 1 | — | 815 |
| Capron | 1 | — | 779, 815 |
| Ransom | 1 | Chicago-Naperville-Elgin, IL-IN | 815 |
| Garden Prairie | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Paw Paw | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| West Brooklyn | 1 | — | 815 |
| Chatsworth | 1 | — | 779, 815 |
| Dover | 1 | — | 815 |
| Tiskilwa | 1 | — | 815 |
| Grand Detour | 1 | — | 779, 815 |
| Forrest | 1 | — | 779, 815 |
| Stockland | 1 | — | 779, 815 |
| Piper City | 1 | — | 779, 815 |
| Strawn | 1 | — | 815 |
| Fairbury | 1 | — | 779, 815 |
| Wyanet | 1 | — | 815 |
| Lisbon | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| South Sharon | 1 | — | 779, 815 |
| Graymont | 1 | — | 779, 815 |
| Genoa | 1 | Chicago-Naperville-Elgin, IL-IN | 779, 815 |
| Harding | 1 | — | 779, 815 |
| Flanagan | 1 | — | 779, 815 |
| Shabbona | 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 |
| Wenona | 1 | — | 779, 815 |
| Long Point | 1 | — | 779, 815 |
| Leonore | 1 | — | 815 |
| Rutland | 1 | — | 779, 815 |
| Magnolia | 1 | — | 779, 815 |
| McNabb | 1 | — | 815 |
| Milford | 1 | — | 779, 815 |
| Emington | 1 | — | 779, 815 |
| Hooppole | 1 | — | 779, 815 |
| Cabery | 1 | — | 779, 815 |
| Wellington | 1 | — | 779, 815 |
| Odell | 1 | — | 815 |
FAQ
What is the biggest city in area code 815?
Rockford holds the most active prefixes (89), making it the code's largest numbering locality.
How many places does 815 cover?
200 rate centers in Illinois hold active 815 prefixes, from Rockford down to communities with a single prefix.
Does a 815 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.