Zip Area Code

Rio, Illinois

Rio, Illinois, in Knox County, has ZIP code 61472 and area code 309, with 861 as an overlay.

ZIP code
61472
Area codes
309, 861
Time zone
Central Time
Coordinates
41.1103, -90.3900

ZIP codes in Rio

ZIP codePost officeCountyArea codes
61472RioKnox County309, 861

Area codes for Rio

  • Area code 309

    In service since 1957. Shares its area with 861. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

  • Area code 861

    In service since February 24, 2023. Shares its area with 309. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

Area codes here are matched from telephone rate centers, so a place near a boundary can have local numbers from either side of it.

Time zone

Rio is in the Central Time zone.

Towns near Rio