Illinois · Central Time
Belleville, IL Area Codes
Belleville is served by 2 area codes (618, 730). Here's which is original, which are overlays, and how to pick one for a new local number.
Last updated October 1, 2026
Area codes serving Belleville
Belleville sits in Illinois, part of the Midwest region and the Central Time zone. Its numbers are spread across an overlay of 2 codes that all cover the same ground: 618, 730.
The original code is 618 (in service since 1947). As the area ran low on numbers, regulators added overlay codes on top instead of splitting the city, so longtime residents kept their numbers while new lines received a newer code.
| Code | Area served | In service |
|---|---|---|
| 618 | Southern Illinois, including the Metro East near St. Louis and Carbondale | January 1, 1947 |
| 730 | Southern Illinois, including the Metro East near St. Louis and Carbondale | July 7, 2023 |
Nearby cities sharing these area codes
- O'Fallon
- Granite City
- Edwardsville
- Collinsville
- Alton
- Carbondale
- Mount Vernon
- Marion
- Centralia
- East St. Louis
- Godfrey
How to pick an area code for a new number
When you activate a new line in Belleville, the carrier assigns whichever code has numbers available — you usually can't choose. If a specific code matters to you (for example the prestige of 618), ask the carrier whether any blocks remain, or request a number transfer. All codes here dial identically and cost the same.
Dialing in Belleville
Because Belleville is an overlay area, 10-digit dialing is mandatory: always dial the area code plus the seven-digit number, even for a neighbor. See 10-digit dialing and overlay area codes for the background. For every code in Illinois, visit the Illinois area codes page.
Quick answers
Belleville area code FAQ
What area codes does Belleville use?
Belleville, IL is served by 2 area codes: 618, 730.
Which is the original Belleville area code?
618 is the original code for Belleville, in service since 1947; the others were added later for more numbers.
Do I need to dial the area code in Belleville?
Yes. With multiple overlapping codes, 10-digit dialing is required for every call in this area.