Dennison, Illinois Area Code

Dennison, IL Area Codes are

217 and 447

Dennison, IL is officially utilizing an area code overlay in which area codes 217 and 447 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary.

In addition to Dennison, IL area code information read more about area codes 217 and 447 details and Illinois area codes.

Dennison, IL is located in Clark County and observes the Central Time Zone.
View our Times by Area Code tool.

Illinois Area Code Map