861 Area Code — Illinois
861 is a North American Numbering Plan area code for Illinois, the United States. It covers about 277,410 people in 11 towns and 44 ZIP codes, including Peoria, Moline and Pekin.
| Field | Value |
|---|---|
| Area code | 861 |
| Country | United States (+1) |
| State / province | Illinois |
| Type | Shares its towns with 309 |
| Time zone | Central |
| Population covered | 277,410 |
| Towns covered | 11 |
| ZIP codes | 44 |
| Approx. centre | 40.812, -89.755 |
Where area code 861 is used
Area code 861 is assigned to Illinois, the United States, inside the North American Numbering Plan. Numbers in the code are written (861) NXX-XXXX at home and +1 861 NXX-XXXX when dialled from outside Canada and the United States. Since the NANP moved to 10-digit dialling you must always include the area code, even for a local call.
Other area codes in this footprint: 309. They serve towns in the same territory, so a single street can contain numbers from more than one code. That is normal in the NANP and does not change how you dial.
Towns and cities in area code 861
The 11 towns below are the largest in the 861 footprint, ranked by population. Every one of them links to its own page with the full list of area codes and ZIP codes for that town.
| Town | County | Population | ZIP codes |
|---|---|---|---|
| Peoria | Peoria County | 126,889 | 29 |
| Moline | Rock Island County | 43,748 | 2 |
| Pekin | Tazewell County | 40,577 | 3 |
| Rock Island | Rock Island County | 36,766 | 3 |
| Milan | Rock Island County | 10,073 | 1 |
| Peoria Heights | Peoria County | 5,825 | 1 |
| Creve Coeur | Tazewell County | 4,621 | 1 |
| Mapleton | Peoria County | 3,562 | 1 |
| Edwards | Peoria County | 3,212 | 1 |
| Danvers | McLean County | 2,099 | 1 |
| Rome | Peoria County | 38 | 1 |
Counties covered
| County | ZIP codes |
|---|---|
| Peoria County | 33 |
| Rock Island County | 6 |
| Tazewell County | 4 |
| McLean County | 1 |
Other area codes serving the same towns
Nearby area codes
How to dial area code 861
- Within North America: 861 + 7-digit number (861-NXX-XXXX). The leading 1 is optional on a mobile phone and required on most landlines for long-distance.
- From abroad: your country's international prefix, then 1, then 861, then the 7-digit number — for example 00 1 861 NXX-XXXX from most of Europe.
Frequently asked questions
What area code is 861?
861 is a North American Numbering Plan area code assigned to Illinois, the United States. It covers about 277,410 people in 11 towns.
Is 861 a US or Canadian area code?
861 is a United States area code. Canada and the United States share the +1 country code, so both are part of the same numbering plan.
What time zone is area code 861 in?
Area code 861 is in the Central time zone.
Do I have to dial 10 digits?
Yes. Every NANP call now requires the area code plus the seven-digit number, even for a local call.