815 Area code

--:-- CDT

Standard time:	UTC/GMT -6:00 hours
Daylight saving time:	+1:00 hour
Current time zone offset:	UTC/GMT -5:00 hours
Time zone abbreviation:	CDT

DST starts on Sunday 09 March 2025, 02:00
DST ends on Sunday 02 November 2025, 02:00

The 815 area code lies within the Central Time (CT)

CST - Central Standard Time
CDT - Central Daylight Time when daylight saving time is being observed (from early March to early November)

815 Area code location map

Winnebago County

• Rockford
• Loves Park
• Machesney Park
• Roscoe
• South Beloit
• Pecatonica
• New Milford
• Seward

Will County

• Joliet
• Bolingbrook
• Plainfield
• Romeoville
• New Lenox
• Lockport
• Crest Hill
• Frankfort
• Shorewood
• Channahon
• Manhattan
• Braidwood
• Wilmington
• Elwood

DeKalb County

• DeKalb
• Sycamore
• Sandwich
• Genoa
• Hinckley
• Kirkland
• Waterman
• Malta

McHenry County

• Crystal Lake
• McHenry
• Woodstock
• Harvard
• Lakemoor
• Richmond
• Hebron
• Union

Cook County

• Northbrook

Kankakee County

• Kankakee
• Bradley
• Manteno
• Momence
• Herscher
• Grant Park
• Chebanse
• Hopkins Park

Boone County

• Belvidere
• Poplar Grove
• Capron

Stephenson County

• Freeport
• Lena
• Pearl City
• Orangeville
• Cedarville
• Davis
• Dakota

La Salle County

• Ottawa
• Streator
• Peru
• La Salle
• Mendota
• Marseilles
• Sheridan
• Seneca
• Leland
• Tonica
• Grand Ridge
• Lostant
• Rutland

Lee County

• Dixon
• Amboy
• Franklin Grove
• Ashton
• Paw Paw
• Sublette
• Steward
• Harmon

Whiteside County

• Sterling
• Rock Falls
• Morrison
• Fulton
• Prophetstown
• Tampico
• Lyndon

Grundy County

• Morris
• Minooka
• Coal City
• Mazon

Livingston County

• Pontiac
• Fairbury
• Chatsworth
• Flanagan
• Odell
• Cullom
• Cornell
• Saunemin
• Long Point
• Reddick
• Strawn

Ogle County

• Rochelle
• Byron
• Oregon
• Mount Morris
• Polo
• Forreston
• Grand Detour

Bureau County

• Princeton
• Depue
• Walnut
• Ladd
• Sheffield
• Tiskilwa
• La Moille
• Ohio
• Manlius

Iroquois County

• Watseka
• Gilman
• Clifton
• Onarga
• Milford
• Cissna Park
• Ashkum
• Danforth
• Martinton
• Woodland
• Donovan
• Wellington
• Stockland

Jo Daviess County

• Galena
• Stockton
• Warren
• Hanover
• Elizabeth
• Scales Mound

Carroll County

• Savanna
• Mount Carroll
• Lanark
• Milledgeville
• Shannon
• Thomson
• Chadwick

McLean County

• Chenoa

Putnam County

• Granville
• Hennepin

Marshall County

• Wenona

Kendall County

• Lisbon

Ford County

• Cabery
• Kempton

Henry County

• Hooppole