815 Area Code - Location, Time, Map, Cities and Census Data - ZIP-Codes.com
https://www.zip-codes.com/area-code/area-code-815.asp
WebMar 1, 2024 · Area Code 815 is located in Illinois. It covers 196 cities, including Chicago, Joliet, Rockford, Glenview, and Plainfield. It also covers 26 counties, including Winnebago County, Will County, McHenry County, La Salle County, and Kankakee County. A full list of covered cities and counties is below including its prefix and population coverage.
DA: 51 PA: 86 MOZ Rank: 5