Phone prefix +1 (815) 721-XXXX
Phone prefix: +1815721
This prefix is distributed within the state Illinois
The largest city within this prefix is Rockford, IL
District: Winnebago
The largest organization: AT&T Local
Time Zone: Central
Winter time: UTC-6
Summer time: UTC-5
The largest city within the prefix of +1 (815) 721-XXXX numbers is shown below
Rockford, IL.