Area code for central Illinois, established in 1947 as one of the original North American area codes.
Area code for central Illinois, established in 1947 as one of the original North American area codes. It originally covered most of Metro East and later was redefined after boundary changes in 1951 and 1956.
Area code 217 created as an original NPA
Area code 217 was created in 1947 as one of the original North American area codes, serving much of central Illinois including Springfield and Champaign.
Southern Metro East portion of 217 reassigned to 618
In 1951, a boundary shift reassigned most of the southern portion of Metro East from area code 217 to area code 618.
Metro East of St. Louis reassigned from 217 to 618
Metro East of St. Louis switched from 217 to 618
Most of the Metro East area of St. Louis changed from area code 217 to 618 in 1954, expanding the 618 numbering plan area.
NPA 309 created from split of 815 and part of 217
Northern portion of 217 combined with part of 815 to form 309
All-services overlay for 217 approved by Illinois Commerce Commission
ICC approved NPA 447 as an overlay for 217
On March 6, 2007, in Docket No. 01-0656, the Illinois Commerce Commission approved the addition of area code 447 as an all-services overlay for the 217 region.
NPA 447 overlay on 217 announced
NPA 447 to Overlay NPA 217 (Illinois)
Permissive ten-digit dialing period for the 217/447 overlay
Overlay of area code 447 added to Illinois' central region
Mandatory 10-digit dialing for 217/447 overlay
On February 27, 2021, ten-digit dialing became mandatory for all local calls in the 217/447 overlay region, ending the permissive dialing period.
NPA 447 overlays 217 in central Illinois
NPA 447 entered service as an overlay on 217
The first prefixes in area code 447 were introduced after March 29, 2021, placing 447 into service as an all-services overlay on area code 217.