Forreston - 815 dialing code
Dialing code +1 (815) cities
- Carbon Hill
- Morris
- Union
- Woodstock
- Rockford
- Sheffield
- Woodland
- Dayton
- Fulton
- Millbrook
- Galena
- Sterling
- Nelson
- Arlington
- Clifton
- Spring Valley
- Winslow
- Cedarville
- Dover
- Greenwood
- Prairie Grove
- Bradley
- Cherry Valley
- Magnolia
- Newark
- Sheridan
- Warren
- Stockton
- Compton
- Richmond
- Davis
- Milford
- Princeton
- Mendota
- Lakewood
- Crescent City
- Dixon
- Creston
- Walnut
- Freeport
- Byron
- Elizabeth
- Morrison
- Genoa
- La Salle
- Wellington
- Crystal Lake
- East Brooklyn
- New Milford
- Wilmington
- Buckingham
- Lisbon
- Reddick
- Grand Ridge
- Lee
- Gardner
- Limestone
- Rochelle
- Sycamore
- Milledgeville
- Chatsworth
- Shannon
- Thomson
- Kingston
- Pearl City
- Ashton
- Irwin
- Malta
- Adeline
- Amboy
- Apple Canyon Lake
- Apple River
- Aroma Park
- Ashkum
- Beaverville
- Belvidere
- Bonfield
- Bourbonnais
- Braceville
- Braidwood
- Bull Valley
- Bureau Junction
- Cabery
- Caledonia
- Campus
- Capron
- Cedar Point
- Chadwick
- Channahon
- Chebanse
- Chemung
- Chenoa
- Cherry
- Cissna Park
- Coal City
- Coleta
- Como
- Cornell
- Cortland
- Crest Hill
- Crystal Lawns
- Cullom
- Dakota
- Dalzell
- Dana
- Danforth
- Davis Junction
- Deer Grove
- DeKalb
- De Pue
- Diamond
- Donovan
- Durand
- Dwight
- Earlville
- East Dubuque
- Elwood
- Emington
- Essex
- Fairbury
- Fairmont
- Flanagan
- Forrest
- Forreston
- Frankfort
- Frankfort Square
- Franklin Grove
- Garden Prairie
- German Valley
- Gilman
- Godley
- Grand Detour
- Grant Park
- Granville
- Hanover
- Harmon
- Harvard
- Hebron
- Hennepin
- Herscher
- Hillcrest
- Hinckley
- Holiday Hills
- Hollowayville
- Hooppole
- Hopkins Park
- Ingalls Park
- Iroquois
- Johnsburg
- Joliet
- Kangley
- Kankakee
- Kempton
- Kinsman
- Kirkland
- Ladd
- Lake Holiday
- Lakemoor
- Lake Summerset
- Lakewood Shores
- La Moille
- Lanark
- Leaf River
- Leland
- Lena
- Leonore
- Lockport
- Long Point
- Lostant
- Lost Nation
- Loves Park
- Lyndon
- McCullom Lake
- McHenry
- Machesney Park
- McNabb
- Malden
- Manhattan
- Manlius
- Manteno
- Maple Park
- Marengo
- Mark
- Marseilles
- Martinton
- Mazon
- Menominee
- Millington
- Minooka
- Momence
- Monroe Center
- Mount Carroll
- Mount Morris
- Naplate
- New Bedford
- New Lenox
- Nora
- North Utica
- Odell
- Oglesby
- Ohio
- Onarga
- Orangeville
- Oregon
- Ottawa
- Papineau
- Paw Paw
- Pecatonica
- Peru
- Piper City
- Plainfield
- Plattville
- Polo
- Pontiac
- Poplar Grove
- Preston Heights
- Prophetstown
- Ransom
- Ridott
- Ringwood
- Rock City
- Rockdale
- Rock Falls
- Rockton
- Romeoville
- Roscoe
- Rutland
- St. Anne
- Sammons Point
- Sandwich
- Saunemin
- Savanna
- Scales Mound
- Seatonville
- Seneca
- Shabbona
- Sheldon
- Shorewood
- Somonauk
- South Beloit
- South Wilmington
- Spring Grove
- Standard
- Steward
- Stillman Valley
- Strawn
- Streator
- Sublette
- Sun River Terrace
- Symerton
- Tampico
- Thawville
- The Galena Territory
- Timberlane
- Tiskilwa
- Toluca
- Tonica
- Troy Grove
- Union Hill
- Verona
- Waterman
- Watseka
- Wenona
- West Brooklyn
- Winnebago
- Wonder Lake
- Wyanet