815 area code is a telephone area code in the North American Numbering Plan (NANP) for Rockford and surrounding areas in northern Illinois except for the Chicago metro area. The area code was one of the original area codes created in 1947.
| Area Code | 815 |
|---|---|
| Major City | Rockford |
| Service Date | 01/01/1947 |
| Time Zone | Central |
| Overlay Complex | 779/815 |
| Location | Illinois (IL) |
| Country | United States |
Some of the cities served by area code 815 include Rockford, Joliet, DeKalb, Crystal Lake, Romeoville, Plainfield, Kankakee, McHenry, Freeport and more.
| Area code | City/Town | County |
|---|---|---|
| 815 | Alden | McHenry |
| 815 | Amboy | Lee |
| 815 | Ancona | Livingston |
| 815 | Apple River | Jo Daviess |
| 815 | Arlington | Bureau |
| 815 | Aroma Park | Kankakee |
| 815 | Ashkum | Iroquois |
| 815 | Ashton | Lee |
| 815 | Baileyville | Ogle |
| 815 | Beaverville | Iroquois |
| 815 | Belvidere | Boone |
| 815 | Blackstone | Livingston |
| 815 | Bonfield | Kankakee |
| 815 | Bourbonnais | Kankakee |
| 815 | Braceville | Grundy |
| 815 | Bradley | Kankakee |
| 815 | Braidwood | Will |
| 815 | Buckingham | Kankakee |
| 815 | Bureau | Bureau |
| 815 | Byron | Ogle |
| 815 | Cabery | Ford |
| 815 | Caledonia | Boone |
| 815 | Campus | Livingston |
| 815 | Capron | Boone |
| 815 | Cedar Point | La Salle |
| 815 | Cedarville | Stephenson |
| 815 | Chadwick | Carroll |
| 815 | Chana | Ogle |
| 815 | Channahon | Will |
| 815 | Chatsworth | Livingston |
| 815 | Chebanse | Iroquois |
| 815 | Chenoa | McLean |
| 815 | Cherry | Bureau |
| 815 | Cherry Valley | Winnebago |
| 815 | Cissna Park | Iroquois |
| 815 | Clare | Dekalb |
| 815 | Claytonville | Iroquois |
| 815 | Clifton | Iroquois |
| 815 | Coal City | Grundy |
| 815 | Compton | Lee |
| 815 | Cornell | Livingston |
| 815 | Cortland | Dekalb |
| 815 | Crescent City | Iroquois |
| 815 | Creston | Ogle |
| 815 | Crystal Lake | McHenry |
| 815 | Cullom | Livingston |
| 815 | Dakota | Stephenson |
| 815 | Dalzell | Bureau |
| 815 | Dana | La Salle |
| 815 | Danforth | Iroquois |
| 815 | Davis | Stephenson |
| 815 | Davis Junction | Ogle |
| 815 | Deer Grove | Whiteside |
| 815 | Dekalb | Dekalb |
| 815 | Depue | Bureau |
| 815 | Dixon | Lee |
| 815 | Donovan | Iroquois |
| 815 | Dover | Bureau |
| 815 | Durand | Winnebago |
| 815 | Dwight | Livingston |
| 815 | Earlville | La Salle |
| 815 | East Dubuque | Jo Daviess |
| 815 | Eldena | Lee |
| 815 | Eleroy | Stephenson |
| 815 | Elizabeth | Jo Daviess |
| 815 | Elwood | Will |
| 815 | Emington | Livingston |
| 815 | Esmond | Dekalb |
| 815 | Essex | Kankakee |
| 815 | Fairbury | Livingston |
| 815 | Flanagan | Livingston |
| 815 | Forrest | Livingston |
| 815 | Forreston | Ogle |
| 815 | Frankfort | Will |
| 815 | Franklin Grove | Lee |
| 815 | Freeport | Stephenson |
| 815 | Fulton | Whiteside |
| 815 | Galena | Jo Daviess |
| 815 | Galt | Whiteside |
| 815 | Garden Prairie | Boone |
| 815 | Gardner | Grundy |
| 815 | Genoa | Dekalb |
| 815 | German Valley | Stephenson |
| 815 | Gilman | Iroquois |
| 815 | Goodwine | Iroquois |
| 815 | Grand Ridge | La Salle |
| 815 | Grant Park | Kankakee |
| 815 | Granville | Putnam |
| 815 | Graymont | Livingston |
| 815 | Hanover | Jo Daviess |
| 815 | Harmon | Lee |
| 815 | Harvard | McHenry |
| 815 | Hebron | McHenry |
| 815 | Hennepin | Putnam |
| 815 | Herscher | Kankakee |
| 815 | Hinckley | Dekalb |
| 815 | Holcomb | Ogle |
| 815 | Homer Glen | Will |
| 815 | Hooppole | Henry |
| 815 | Hopkins Park | Kankakee |
| 815 | Iroquois | Iroquois |
| 815 | Joliet | Will |
| 815 | Kankakee | Kankakee |
| 815 | Kasbeer | Bureau |
| 815 | Kempton | Ford |
| 815 | Kent | Stephenson |
| 815 | Kingston | Dekalb |
| 815 | Kinsman | Grundy |
| 815 | Kirkland | Dekalb |
| 815 | La Moille | Bureau |
| 815 | La Salle | La Salle |
| 815 | Ladd | Bureau |
| 815 | Lanark | Carroll |
| 815 | Leaf River | Ogle |
| 815 | Lee | Lee |
| 815 | Lee Center | Lee |
| 815 | Leland | La Salle |
| 815 | Lena | Stephenson |
| 815 | Leonore | La Salle |
| 815 | Lindenwood | Ogle |
| 815 | Lockport | Will |
| 815 | Long Point | Livingston |
| 815 | Lostant | La Salle |
| 815 | Loves Park | Winnebago |
| 815 | Lyndon | Whiteside |
| 815 | Machesney Park | Winnebago |
| 815 | Magnolia | Putnam |
| 815 | Malden | Bureau |
| 815 | Malta | Dekalb |
| 815 | Manhattan | Will |
| 815 | Manlius | Bureau |
| 815 | Manteno | Kankakee |
| 815 | Maple Park | Kane |
| 815 | Marengo | McHenry |
| 815 | Mark | Putnam |
| 815 | Marseilles | La Salle |
| 815 | Martinton | Iroquois |
| 815 | Mazon | Grundy |
| 815 | Mc Connell | Stephenson |
| 815 | Mc Nabb | Putnam |
| 815 | McHenry | McHenry |
| 815 | Mendota | La Salle |
| 815 | Milford | Iroquois |
| 815 | Milledgeville | Carroll |
| 815 | Millington | Kendall |
| 815 | Minooka | Grundy |
| 815 | Momence | Kankakee |
| 815 | Monroe Center | Ogle |
| 815 | Morris | Grundy |
| 815 | Morrison | Whiteside |
| 815 | Mount Carroll | Carroll |
| 815 | Mount Morris | Ogle |
| 815 | Nachusa | Lee |
| 815 | New Bedford | Bureau |
| 815 | New Lenox | Will |
| 815 | Newark | Kendall |
| 815 | Nora | Jo Daviess |
| 815 | Odell | Livingston |
| 815 | Oglesby | La Salle |
| 815 | Ohio | Bureau |
| 815 | Onarga | Iroquois |
| 815 | Orangeville | Stephenson |
| 815 | Oregon | Ogle |
| 815 | Ottawa | La Salle |
| 815 | Papineau | Iroquois |
| 815 | Paw Paw | Lee |
| 815 | Pearl City | Stephenson |
| 815 | Pecatonica | Winnebago |
| 815 | Peru | La Salle |
| 815 | Piper City | Ford |
| 815 | Plainfield | Will |
| 815 | Polo | Ogle |
| 815 | Pontiac | Livingston |
| 815 | Poplar Grove | Boone |
| 815 | Princeton | Bureau |
| 815 | Prophetstown | Whiteside |
| 815 | Putnam | Putnam |
| 815 | Ransom | La Salle |
| 815 | Reddick | Kankakee |
| 815 | Richmond | McHenry |
| 815 | Ridott | Stephenson |
| 815 | Ringwood | McHenry |
| 815 | Rochelle | Ogle |
| 815 | Rock City | Stephenson |
| 815 | Rock Falls | Whiteside |
| 815 | Rockford | Winnebago |
| 815 | Rockton | Winnebago |
| 815 | Romeoville | Will |
| 815 | Roscoe | Winnebago |
| 815 | Rutland | La Salle |
| 815 | Sandwich | Dekalb |
| 815 | Saunemin | Livingston |
| 815 | Savanna | Carroll |
| 815 | Scales Mound | Jo Daviess |
| 815 | Seatonville | Bureau |
| 815 | Seneca | La Salle |
| 815 | Serena | La Salle |
| 815 | Seward | Winnebago |
| 815 | Shabbona | Dekalb |
| 815 | Shannon | Carroll |
| 815 | Sheffield | Bureau |
| 815 | Sheldon | Iroquois |
| 815 | Sheridan | La Salle |
| 815 | Shirland | Winnebago |
| 815 | Somonauk | Dekalb |
| 815 | South Beloit | Winnebago |
| 815 | South Wilmington | Grundy |
| 815 | Spring Grove | McHenry |
| 815 | Spring Valley | Bureau |
| 815 | St Anne | Kankakee |
| 815 | Standard | Putnam |
| 815 | Sterling | Whiteside |
| 815 | Steward | Lee |
| 815 | Stillman Valley | Ogle |
| 815 | Stockland | Iroquois |
| 815 | Stockton | Jo Daviess |
| 815 | Strawn | Livingston |
| 815 | Streator | La Salle |
| 815 | Sublette | Lee |
| 815 | Sycamore | Dekalb |
| 815 | Tampico | Whiteside |
| 815 | Thomson | Carroll |
| 815 | Tiskilwa | Bureau |
| 815 | Toluca | Marshall |
| 815 | Tonica | La Salle |
| 815 | Triumph | La Salle |
| 815 | Troy Grove | La Salle |
| 815 | Union | McHenry |
| 815 | Union Hill | Kankakee |
| 815 | Utica | La Salle |
| 815 | Van Orin | Bureau |
| 815 | Verona | Grundy |
| 815 | Walnut | Bureau |
| 815 | Warren | Jo Daviess |
| 815 | Waterman | Dekalb |
| 815 | Watseka | Iroquois |
| 815 | Wedron | La Salle |
| 815 | Wellington | Iroquois |
| 815 | Wenona | Marshall |
| 815 | West Brooklyn | Lee |
| 815 | Wilmington | Will |
| 815 | Winnebago | Winnebago |
| 815 | Winslow | Stephenson |
| 815 | Wonder Lake | McHenry |
| 815 | Woodland | Iroquois |
| 815 | Woodstock | McHenry |
| 815 | Woosung | Ogle |
| 815 | Wyanet | Bureau |