ILLINOIS · AREA CODE GUIDE
815 area code location: Joliet and Rockford, Illinois
- Local date and time
- Central Time
Map data: HSIP (2010) · NANPA · US Census Bureau, checked 26 September 2026. Boundaries are approximate.
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Download the 815 area code map
A printable area code 815 location map, with time zone and state. Use the PNG image in a document or slide; the SVG stays sharp at any size.
815 area code at a glance
- State
- Illinois
- Primary cities
- Joliet, Rockford, and Plainfield
- Established
- Population
- Largest community: Joliet, 152,241 (2025)Not an area-code population.
- Prefixes in service
- 786 as of 13 October 2026
An area code does not show where a caller is now.
History
Country and calling code: United States (+1).
New code planned: No, as of 22 September 2026.
- : 779 added as an overlay on 815
Time zone
- Central Time
- Standard time UTC−06:00
- Daylight saving time UTC−05:00
Counties and cities covered
815 numbers are issued across 198 communities. These are telephone exchange areas, which follow the phone network rather than city limits, so a place can sit just outside the boundary of the town it is named for.
Counties of the communities we could place (the code may reach further): LaSalle County, Iroquois County, Livingston County, Bureau County, Lee County, DeKalb County, Ogle County, Grundy County, McHenry County, Will County, Winnebago County, Kankakee County, Stephenson County, Jo Daviess County, Carroll County, Kendall County, Whiteside County, Boone County, Putnam County, Ford County, Marshall County, Cook County, Henry County, Kane County, and McLean County.
- Joliet
- Rockford
- Plainfield
- Crystal Lake
- Dekalb
- McHenry
- New Lenox
- Lockport
- Woodstock
- Belvidere
- Kankakee
- Freeport
- Frankfort
- Sycamore
- Ottawa
- Morris
- Dixon
- Sterling
- Minooka
- Streator
- Roscoe
- Manhattan
- Pontiac
- Harvard
- Rochelle
173 more communities
- Manteno
- South Beloit
- Rockton
- Marengo
- Princeton
- Sandwich
- Mendota
- Braidwood
- Coal City
- Wonder Lake
- Genoa
- Spring Grove
- Spring Valley
- Poplar Grove
- Marseilles
- Watseka
- Dwight
- Morrison
- Byron
- Oglesby
- Fairbury
- Oregon
- Fulton
- Galena
- Momence
- Winnebago
- Cherry Valley
- Mount Morris
- Savanna
- Lena
- Seneca
- Elwood
- Polo
- Amboy
- Richmond
- Sheridan
- Pecatonica
- Hinckley
- Utica
- Prophetstown
- Somonauk
- Chenoa
- Gilman
- Stockton
- Waterman
- Kirkland
- Thomson
- Earlville
- Maple Park
- Herscher
- East Dubuque
- Lanark
- Mount Carroll
- Capron
- Forreston
- Hebron
- Ladd
- Durand
- Gardner
- Granville
- Toluca
- Onarga
- Clifton
- Warren
- Grant Park
- Walnut
- Chatsworth
- Malta
- Saint Anne
- Milford
- Stillman Valley
- Flanagan
- Forrest
- Chebanse
- Milledgeville
- Mazon
- Newark
- Odell
- Shirland
- Wenona
- Sheldon
- Ashton
- Leland
- Franklin Grove
- Shabbona
- Wyanet
- Shannon
- Hanover
- New Milford
- Paw Paw
- Sheffield
- Cissna Park
- Pearl City
- Hennepin
- Orangeville
- Tonica
- Piper City
- Ashkum
- Tiskilwa
- Elizabeth
- Union
- La Moille
- Tampico
- Cedarville
- Creston
- Davis
- Danforth
- Crescent City
- Lyndon
- Grand Ridge
- Cullom
- Dakota
- Chadwick
- Ohio
- Cornell
- Lostant
- Scales Mound
- German Valley
- Leaf River
- Monroe Center
- Saunemin
- Sublette
- Apple River
- Martinton
- Ransom
- Beaverville
- Manlius
- Winslow
- McNabb
- Lisbon
- Compton
- Cedar Point
- Magnolia
- Rutland
- Bureau
- Donovan
- Woodland
- Cabery
- Steward
- Plattville
- Verona
- Long Point
- Wellington
- Stockland
- Reddick
- Kempton
- Hooppole
- Coleta
- Campus
- Dover
- West Brooklyn
- Nelson
- Leonore
- Harmon
- Strawn
- Emington
- Kinsman
- Depue
- Garden Prairie
- Grand Detour
- Graymont
- Harding
- La Salle
- Massbach
- McConnell
- Putnam
- Rock Cut
- Seward
- South Bergen
- South Sharon
- Stelle
- Thomas
- Wilmington
Notable places in 815
| Place | Where | What it is |
|---|---|---|
| Northern Illinois University | 2.6 km from Dekalb | University, 17,359 12-month enrollment (2023–24) |
| Chicago Rockford International Airport | 4.8 km from New Milford | Commercial airport, 132,154 enplanements (2024) |
| Joliet Regional Airport | 2.6 km from Joliet | Airport |
| Lewis University Airport | 5.6 km from Lockport | Airport |
| University of St. Francis | 4.7 km from Joliet | University, 5,174 12-month enrollment (2023–24) |
| BMO Center | 2.9 km from Rockford | Arena |
| Lewis University | 4.2 km from Lockport | University, 8,396 12-month enrollment (2023–24) |
| Anderson Japanese Gardens | 3.5 km from Rockford | Botanical garden |
| Chicago Athenaeum | 1.2 km from Galena | Museum |
| Chana School | 1.1 km from Oregon | Museum |
Area code 779 has its own page.
Area code 815
815 started service on .
No new code is planned for the region as of .
Questions about 815
Where is the 815 area code?
815 is in Illinois. Its numbers are issued in Joliet, Rockford, Plainfield, and 195 other communities.
What time zone is area code 815 in?
815 is in Central Time. Daylight saving time is observed.
Does 815 have an overlay?
Yes. 779 was added as an overlay on 815 on 17 March 2007.
What cities are in the 815 area code?
Joliet, Rockford, Plainfield, Crystal Lake, and Dekalb, and 193 other communities.
What state is area code 815 in?
Area code 815 is in Illinois.
What counties are covered by area code 815?
Area code 815 covers communities in LaSalle County, Iroquois County, Livingston County, Bureau County, Lee County, DeKalb County, Ogle County, Grundy County, McHenry County, Will County, Winnebago County, Kankakee County, Stephenson County, Jo Daviess County, Carroll County, Kendall County, Whiteside County, Boone County, Putnam County, Ford County, Marshall County, Cook County, Henry County, Kane County, and McLean County.
Is 815 a toll-free area code?
No. 815 is a geographic area code. The toll-free codes are 800, 833, 844, 855, 866, 877, and 888.
Sources: NANPA area code listing, NANPA places by area code, NANPA central office code assignments, U.S. Census Bureau population estimates, OMB metropolitan area delineations. Checked .
Business phone numbers in area code 815, answered by an AI agent
A local number for Joliet, Rockford, and Plainfield, Illinois, with an AI receptionist that takes caller details, answers the questions you give it, and books appointments. Numbers depend on what carriers have left.