Telephone Area 815. .
Prefix: +1815
This prefix is distributed within the state Illinois
The largest city in the region is Rockford
Time Zone: Central
Winter time: UTC-6
Summer time: UTC-5
Below on the map, there is indicated the largest city in the telephone area +1-815-...-.... Illinois Rockford.
Phone numbers +1-815-YYY-YYYY
| Company | District | Major City | Prefix |
|---|---|---|---|
| Paetec Communications | La Salle, IL | +1-815200-SSSS | |
| Usa Mobility Wireless | Winnebago | Rockford, IL | +1-815201-SSSS |
| New Cingular Wireless PCS | Winnebago | Oglesby, IL | +1-815202-SSSS |
| Usa Mobility Wireless | Will | Joliet, IL | +1-815203-SSSS |
| Usa Mobility Wireless | Mchenry | Crystal Lake, IL | +1-815204-SSSS |
| Usa Mobility Wireless | Cook | La Grange Park, IL | +1-815205-SSSS |
| Ameritech Illinois | Mchenry | Woodstock, IL | +1-815206-SSSS |
| AT&T Local | Will | Joliet, IL | +1-815207-SSSS |
| Sprint Communications Company, L.p. | Whiteside | Fulton, IL | +1-815208-SSSS |
| Level 3 Communications | Winnebago | Rockford, IL | +1-815209-SSSS |
| New Cingular Wireless PCS | Will | Joliet, IL | +1-815210-SSSS |
| T-mobile Usa | Will | Joliet, IL | +1-815212-SSSS |
| United States Cellular Corp. - Illinois | Whiteside | Sterling, IL | +1-815213-SSSS |
| Rcn Telecom Services Of Illinois | Kankakee | Kankakee, IL | +1-815214-SSSS |
| Globalcom-il | Will | New Lenox, IL | +1-815215-SSSS |
| Cellco Partnership DBA Verizon Wireless | Kankakee | Kankakee, IL | +1-815216-SSSS |
| Digital Network Access Communications | Dekalb | Dekalb, IL | +1-815217-SSSS |
| Cellco Partnership DBA Verizon Wireless | Winnebago | Rockford, IL | +1-815218-SSSS |
| United States Cellular Corp. - Illinois | Crystal Lake, IL | +1-815219-SSSS | |
| Ameritech Illinois | La Salle | La Salle, IL | +1-815220-SSSS |
| Teleport Communications Group - Chicago | Will | Lockport, IL | +1-815221-SSSS |
| Cellco Partnership DBA Verizon Wireless | Winnebago | Rockford, IL | +1-815222-SSSS |
| Ameritech Illinois | La Salle | La Salle, IL | +1-815223-SSSS |
| Ameritech Illinois | La Salle | La Salle, IL | +1-815224-SSSS |
| Citizens Telecom Co Illinois-frontier Citizens -il | Carroll | Milledgeville, IL | +1-815225-SSSS |
| Ameritech Illinois | Winnebago | Rockford, IL | +1-815226-SSSS |
| Ameritech Illinois | Winnebago | Rockford, IL | +1-815227-SSSS |
| New Cingular Wireless PCS | La Salle | Oglesby, IL | +1-815228-SSSS |
| Ameritech Illinois | Winnebago | Rockford, IL | +1-815229-SSSS |
| Broadwing Communications | Will | Plainfield, IL | +1-815230-SSSS |
| Ameritech Illinois | Winnebago | Rockford, IL | +1-815231-SSSS |
| Frontier North | Stephenson | Freeport, IL | +1-815232-SSSS |
| Frontier North | Stephenson | Freeport, IL | +1-815233-SSSS |
| Frontier North | Ogle | Byron, IL | +1-815234-SSSS |
| Frontier North | Stephenson | Freeport, IL | +1-815235-SSSS |
| New Cingular Wireless PCS | Mchenry | Woodstock, IL | +1-815236-SSSS |
| Ameritech Illinois | Grundy | Gardner, IL | +1-815237-SSSS |
| Cellco Partnership DBA Verizon Wireless | Stephenson | Freeport, IL | +1-815238-SSSS |
| Frontier North | Winnebago | Pecatonica, IL | +1-815239-SSSS |
| Charter Fiberlink - Illinois | Will | Rockford, IL | +1-815240-SSSS |
| American Messaging (am) | Cook | Northbrook, IL | +1-815241-SSSS |
| Usa Mobility Wireless | Winnebago | Rockford, IL | +1-815242-SSSS |
| United States Cellular Corp. - Illinois | Winnebago | Rockford, IL | +1-815243-SSSS |
| Gallatin River Communications DBA Centurylink | Carroll | Mt Carroll, IL | +1-815244-SSSS |
| New Cingular Wireless PCS | Mchenry | Woodstock, IL | +1-815245-SSSS |
| Frontier North | La Salle | Earlville, IL | +1-815246-SSSS |
| Frontier North | Winnebago | Pecatonica, IL | +1-815247-SSSS |
| Frontier North | Winnebago | Durand, IL | +1-815248-SSSS |
| Frontier North | La Salle | Grand Ridge, IL | +1-815249-SSSS |
| Comcast Phone Of Illinois DBA Comco | La Salle, IL | +1-815250-SSSS | |
| Gallatin River Communications DBA Centurylink | Whiteside | Rock Falls, IL | +1-815251-SSSS |
| New Cingular Wireless PCS | La Salle | Oglesby, IL | +1-815252-SSSS |
| Frontier Communications Of Illinois | Ford | Kempton, IL | +1-815253-SSSS |
| Ameritech Illinois | Will | Plainfield, IL | +1-815254-SSSS |
| Us Xchange Of Illinois LLC DBA Choice One Comm Il | Mchenry | Minooka, IL | +1-815255-SSSS |
| Stelle Telephone Co. | Ford | Stelle, IL | +1-815256-SSSS |
| Illinois Valley Cellular Rsa 2-ii Partnership | La Salle | Streator, IL | +1-815257-SSSS |
| New Cingular Wireless PCS | Will | Joliet, IL | +1-815258-SSSS |
| Gallatin River Communications DBA Centurylink | Carroll | Thomson, IL | +1-815259-SSSS |
| United States Cellular Corp. - Illinois | Will | Joliet, IL | +1-815260-SSSS |
| Mci Worldcom Communications | Mchenry | Crystal Lake, IL | +1-815261-SSSS |
| Cellco Partnership DBA Verizon Wireless | Winnebago | Rockford, IL | +1-815262-SSSS |
| Cellco Partnership DBA Verizon Wireless | Kankakee | Kankakee, IL | +1-815263-SSSS |
| Frontier North | Dekalb | Waterman, IL | +1-815264-SSSS |
| Ameritech Illinois | Iroquois | Gilman, IL | +1-815265-SSSS |
| Frontier North | Stephenson | Freeport, IL | +1-815266-SSSS |
| Mci Worldcom Communications | Will | Plainfield, IL | +1-815267-SSSS |
| Ameritech Illinois | Iroquois | Onarga, IL | +1-815268-SSSS |
| Frontier Communications Of The Carolinas, Inc | Iroquois | Danforth, IL | +1-815269-SSSS |
| Charter Fiberlink - Illinois | Lanark, IL | +1-815270-SSSS | |
| Mci Worldcom Communications | Mchenry | Mchenry, IL | +1-815271-SSSS |
| Mci Worldcom Communications | Will | Joliet, IL | +1-815272-SSSS |
| Gallatin River Communications DBA Centurylink | Carroll | Savanna, IL | +1-815273-SSSS |
| New Cingular Wireless PCS | Will | Joliet, IL | +1-815274-SSSS |
| Cellco Partnership DBA Verizon Wireless | Stephenson | Freeport, IL | +1-815275-SSSS |
| Teleport Communications Group - Chicago | Mchenry | Crystal Lake, IL | +1-815276-SSSS |
| Teleport Communications Group - Chicago | Will | Frankfort, IL | +1-815277-SSSS |
| Cellco Partnership DBA Verizon Wireless | Kankakee | Kankakee, IL | +1-815278-SSSS |
| American Messaging (am) | Kankakee | Kankakee, IL | +1-815279-SSSS |
| Teleport Communications Group - Chicago | Will | Joliet, IL | +1-815280-SSSS |
