815 Area Code

Primary cities: Rockford, Joliet, Kankakee, Woodstock, De Kalb ... all cities

Cities: Amboy, Apple River, Ashkum, Ashton, Beaverville, Belvidere, Braidwood, Bureau, Byron, Cabery, Campus, Capron, Cedar Point, Cedarville, Chadwick, Chatsworth, Chebanse, Chenoa, Cherry Valley, Cissna Park, Clifton, Coal City, Coleta, Compton, Cornell, Crescent City, Creston, Crystal Lake, Cullom, Dakota, Danforth, Davis, De Kalb, Depue, Dixon, Donovan, Dover, Durand, Dwight, Earlville, East Dubuque, Elizabeth, Elwood, Emington, Fairbury, Flanagan, Forrest, Forreston, Frankfort, Franklin Grove, Freeport, Fulton, Galena, Garden Prairie, Gardner, Genoa, German Valley, Gilman, Grand Detour, Grand Ridge, Grant Park, Granville, Graymont, Hanover, Harding, Harmon, Harvard, Hebron, Hennepin, Herscher, Hinckley, Hooppole, Joliet, Kankakee, Kempton, Kinsman, Kirkland, La Grange, La Moille, La Salle, Ladd, Lanark, Leaf River, Leland, Lena, Leonore, Lisbon, Lockport, Long Point, Lostant, Lyndon, Magnolia, Malta, Manhattan, Manlius, Manteno, Maple Park, Marengo, Marseilles, Martinton, Massbach, Mazon, Mcconnell, Mchenry, Mcnabb, Mendota, Milford, Milledgeville, Minooka, Momence, Monroe Center, Morris, Morrison, Mount Carroll, Mount Morris, Nelson, New Lenox, New Milford, Newark, Northbrook, Odell, Oglesby, Ohio, Onarga, Orangeville, Oregon, Ottawa, Paw Paw, Pearl City, Pecatonica, Piper City, Plainfield, Plattville, Polo, Pontiac, Poplar Grove, Princeton, Prophetstown, Putnam, Ransom, Reddick, Richmond, Rochelle, Rock Cut, Rockford, Rockton, Roscoe, Rutland, Sandwich, Saunemin, Savanna, Scales Mound, Seneca, Seward, Shabbona, Shannon, Sheffield, Sheldon, Sheridan, Shirland, Somonauk, South Beloit, South Bergen, South Sharon, Spring Grove, Spring Valley, St. Anne, Stelle, Sterling, Steward, Stillman Valley, Stockland, Stockton, Strawn, Streator, Sublette, Sycamore, Tampico, Thomas, Thomson, Tiskilwa, Toluca, Tonica, Union, Utica, Verona, W Brooklyn, Walnut, Warren, Waterman, Watseka, Wellington, Wenona, Wilmington, Winnebago, Winslow, Wonder Lake, Woodland, Woodstock, Wyanet