Illinois area codes

Illinois has 17 area codes across 10 numbering plan areas, with statewide 10-digit dialing since 2023. The Chicago metro carries most of them, including 312/773/872 for the city and several suburban overlays. The newest codes (447, 464, 730, 861) date to 2021–2023.

Major metro areas

All Illinois area codes

Every code opens its profile — codes with a full write-up show their place; the rest show live numbering data while their detailed profile is added.