Area code 861: Illinois
Area code 861 is a US state area code for Illinois, on Central Time. It shares its area with 309, so local numbers there can start with any of them. Local calls there take 10 digits.
Local time in area code 861
America/Chicago
Prefixes in service
No public data
Too new for prefix data
Area code 861 facts
| Location | Illinois, United States |
|---|---|
| Time zone | Central Time |
| Overlays | 309 |
| Overlay of | 309 |
| In service since | February 24, 2023 |
| Local calls | 10 digits; toll calls 1 + 10 digits |
| Carrier | Not shown. An area code is where a number was issued; numbers port between carriers. Check line type |
How do I dial a 861 number?
NANPA's dialling plan for 861: local calls inside the code take 10 digits, toll calls 1 + 10 digits. From another area code, dial 1 first. From abroad, use +1. The examples use 555-0147, from a range reserved for fictional numbers.
| Local call inside 861 | 861-555-0147 |
|---|---|
| From another US or Canadian area code | 1-861-555-0147 |
| From outside North America | +1 861 555 0147 |
| E.164, for CRMs and SMS tools | +18615550147 |
When did area code 861 start?
Area code 861 went into service on February 24, 2023 as an overlay of 309. Today 861 and 309 cover the same area as an overlay, which is why 10-digit dialling is needed for local calls there.
Tools for 861 numbers
- Area code lookup
Look up any code or a whole list of numbers, or find the codes for a state or city.
- Area code time zone
Local time for a list of numbers, with a callable-now flag.
- NPA-NXX lookup
Rate center and state for one prefix, a level below the area code.
- TCPA calling hours checker
Whether it's inside the federal 8 a.m. to 9 p.m. calling window there now.
Next step
A 861 number tells you where it was issued, not what it is now.
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Area code 861 questions
- What state is area code 861?
- Area code 861 is in Illinois, United States.
- What time zone is area code 861 in?
- Central Time.
- What area codes overlay 861?
- 309. An overlay adds a new code to the same area instead of splitting it, so neighbours can have different area codes and local calls need 10 digits.
- When did area code 861 start?
- Area code 861 went into service on February 24, 2023 as an overlay of 309.
- Is an 861 number a cell phone or a landline?
- The area code can't tell you. In the US and Canada mobiles, landlines and VoIP lines share area codes and prefixes, and numbers move between carriers and line types. Only a live line-type lookup answers it for one number.
Other area codes in Illinois
Sources
Location, overlays, in-service date and dialling plan: NANPA NPA database, file dated 10/16/2026. Prefixes and rate centers: NANPA central office code assignments, 10/17/2026. Time zones mapped to the IANA time zone database. By the SimpleVerifier Team; how we build these pages.