Area code 861
Where the 861 area code is, its overlay and how to dial a +1 861 number from anywhere.
The 861 area code is in Illinois, United States (Central (CT)). To call from abroad: +1 861 555-0123. It is an overlay, so all 10 digits are dialled.
The 861 area code is a geographic North American Numbering Plan (NANP) code covering Illinois. It has been in service since 19-Nov-2021 and sits in the Central (CT) time zone.
How to dial a 861 number
+1 861 555-01231 861 555-0123861 555-0123Other Illinois area codes
Frequently asked questions
Where is the 861 area code?
The 861 area code is in Illinois, United States (Central (CT)).
Is 861 an overlay area code?
Yes. 861 overlays the same region as 309, so callers dial all 10 digits.
Do I have to dial 10 digits for 861?
Yes — dial the area code plus the seven-digit number.
How do I call a 861 number from another country?
Dial your exit code (or +), then 1, then 861, then the number: +1 861 555-0123.
Source: NANPA numbering plan. An area code covers a region, not a precise address — a 861 number does not pinpoint a street or ZIP code.
Who issues +1 861 numbers
Phone companies hold blocks of numbers in each area code. The main holders in 861:
About 0% of the 19 prefixes in use belong to mobile carriers: a 861 number is often a cell phone, and it may have moved to another carrier since.
Sources: FTC Do Not Call reported calls (numbers as reported by consumers, not verified), NANPA central office code assignments.
All US area codes United States +1 Map of area code 861 — cities & rate centres