Telephone Area +1 (815) XXX-XXXX
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.
In the United States, telephone numbers are divided into a country code (+1), an area code (or prefix), which is three digits long, and a subscriber number (seven digits). These are just a few examples, and there are over 300 area codes in the United States. Each code can cover both large cities and less populated areas depending on population density and telephone network distribution.
Phone numbers +1 (815) XXX-XXXX
| Company | District | Major City | Prefix |
|---|---|---|---|
| Paetec Communications | La Salle, IL | +1 (815) 200-XXXX | |
| Usa Mobility Wireless | Winnebago | Rockford, IL | +1 (815) 201-XXXX |
| New Cingular Wireless PCS | Winnebago | Oglesby, IL | +1 (815) 202-XXXX |
| Usa Mobility Wireless | Will | Joliet, IL | +1 (815) 203-XXXX |
| Usa Mobility Wireless | Mchenry | Crystal Lake, IL | +1 (815) 204-XXXX |
| Usa Mobility Wireless | Cook | La Grange Park, IL | +1 (815) 205-XXXX |
| Ameritech Illinois | Mchenry | Woodstock, IL | +1 (815) 206-XXXX |
| AT&T Local | Will | Joliet, IL | +1 (815) 207-XXXX |
| Sprint Communications Company, L.p. | Whiteside | Fulton, IL | +1 (815) 208-XXXX |
| Level 3 Communications | Winnebago | Rockford, IL | +1 (815) 209-XXXX |
| New Cingular Wireless PCS | Will | Joliet, IL | +1 (815) 210-XXXX |
| T-mobile Usa | Will | Joliet, IL | +1 (815) 212-XXXX |
| United States Cellular Corp. - Illinois | Whiteside | Sterling, IL | +1 (815) 213-XXXX |
| Rcn Telecom Services Of Illinois | Kankakee | Kankakee, IL | +1 (815) 214-XXXX |
| Globalcom-il | Will | New Lenox, IL | +1 (815) 215-XXXX |
| Cellco Partnership DBA Verizon Wireless | Kankakee | Kankakee, IL | +1 (815) 216-XXXX |
| Digital Network Access Communications | Dekalb | Dekalb, IL | +1 (815) 217-XXXX |
| Cellco Partnership DBA Verizon Wireless | Winnebago | Rockford, IL | +1 (815) 218-XXXX |
| United States Cellular Corp. - Illinois | Crystal Lake, IL | +1 (815) 219-XXXX | |
| Ameritech Illinois | La Salle | La Salle, IL | +1 (815) 220-XXXX |
| Teleport Communications Group - Chicago | Will | Lockport, IL | +1 (815) 221-XXXX |
| Cellco Partnership DBA Verizon Wireless | Winnebago | Rockford, IL | +1 (815) 222-XXXX |
| Ameritech Illinois | La Salle | La Salle, IL | +1 (815) 223-XXXX |
| Ameritech Illinois | La Salle | La Salle, IL | +1 (815) 224-XXXX |
| Citizens Telecom Co Illinois-frontier Citizens -il | Carroll | Milledgeville, IL | +1 (815) 225-XXXX |
| Ameritech Illinois | Winnebago | Rockford, IL | +1 (815) 226-XXXX |
| Ameritech Illinois | Winnebago | Rockford, IL | +1 (815) 227-XXXX |
| New Cingular Wireless PCS | La Salle | Oglesby, IL | +1 (815) 228-XXXX |
| Ameritech Illinois | Winnebago | Rockford, IL | +1 (815) 229-XXXX |
| Broadwing Communications | Will | Plainfield, IL | +1 (815) 230-XXXX |
| Ameritech Illinois | Winnebago | Rockford, IL | +1 (815) 231-XXXX |
| Frontier North | Stephenson | Freeport, IL | +1 (815) 232-XXXX |
| Frontier North | Stephenson | Freeport, IL | +1 (815) 233-XXXX |
| Frontier North | Ogle | Byron, IL | +1 (815) 234-XXXX |
| Frontier North | Stephenson | Freeport, IL | +1 (815) 235-XXXX |
| New Cingular Wireless PCS | Mchenry | Woodstock, IL | +1 (815) 236-XXXX |
| Ameritech Illinois | Grundy | Gardner, IL | +1 (815) 237-XXXX |
| Cellco Partnership DBA Verizon Wireless | Stephenson | Freeport, IL | +1 (815) 238-XXXX |
| Frontier North | Winnebago | Pecatonica, IL | +1 (815) 239-XXXX |
| Charter Fiberlink - Illinois | Will | Rockford, IL | +1 (815) 240-XXXX |
| American Messaging (am) | Cook | Northbrook, IL | +1 (815) 241-XXXX |
| Usa Mobility Wireless | Winnebago | Rockford, IL | +1 (815) 242-XXXX |
| United States Cellular Corp. - Illinois | Winnebago | Rockford, IL | +1 (815) 243-XXXX |
| Gallatin River Communications DBA Centurylink | Carroll | Mt Carroll, IL | +1 (815) 244-XXXX |
| New Cingular Wireless PCS | Mchenry | Woodstock, IL | +1 (815) 245-XXXX |
| Frontier North | La Salle | Earlville, IL | +1 (815) 246-XXXX |
| Frontier North | Winnebago | Pecatonica, IL | +1 (815) 247-XXXX |
| Frontier North | Winnebago | Durand, IL | +1 (815) 248-XXXX |
| Frontier North | La Salle | Grand Ridge, IL | +1 (815) 249-XXXX |
| Comcast Phone Of Illinois DBA Comco | La Salle, IL | +1 (815) 250-XXXX | |
| Gallatin River Communications DBA Centurylink | Whiteside | Rock Falls, IL | +1 (815) 251-XXXX |
| New Cingular Wireless PCS | La Salle | Oglesby, IL | +1 (815) 252-XXXX |
| Frontier Communications Of Illinois | Ford | Kempton, IL | +1 (815) 253-XXXX |
| Ameritech Illinois | Will | Plainfield, IL | +1 (815) 254-XXXX |
| Us Xchange Of Illinois LLC DBA Choice One Comm Il | Mchenry | Minooka, IL | +1 (815) 255-XXXX |
| Stelle Telephone Co. | Ford | Stelle, IL | +1 (815) 256-XXXX |
| Illinois Valley Cellular Rsa 2-ii Partnership | La Salle | Streator, IL | +1 (815) 257-XXXX |
| New Cingular Wireless PCS | Will | Joliet, IL | +1 (815) 258-XXXX |
| Gallatin River Communications DBA Centurylink | Carroll | Thomson, IL | +1 (815) 259-XXXX |
| United States Cellular Corp. - Illinois | Will | Joliet, IL | +1 (815) 260-XXXX |
| Mci Worldcom Communications | Mchenry | Crystal Lake, IL | +1 (815) 261-XXXX |
| Cellco Partnership DBA Verizon Wireless | Winnebago | Rockford, IL | +1 (815) 262-XXXX |
| Cellco Partnership DBA Verizon Wireless | Kankakee | Kankakee, IL | +1 (815) 263-XXXX |
| Frontier North | Dekalb | Waterman, IL | +1 (815) 264-XXXX |
| Ameritech Illinois | Iroquois | Gilman, IL | +1 (815) 265-XXXX |
| Frontier North | Stephenson | Freeport, IL | +1 (815) 266-XXXX |
| Mci Worldcom Communications | Will | Plainfield, IL | +1 (815) 267-XXXX |
| Ameritech Illinois | Iroquois | Onarga, IL | +1 (815) 268-XXXX |
| Frontier Communications Of The Carolinas, Inc | Iroquois | Danforth, IL | +1 (815) 269-XXXX |
| Charter Fiberlink - Illinois | Lanark, IL | +1 (815) 270-XXXX | |
| Mci Worldcom Communications | Mchenry | Mchenry, IL | +1 (815) 271-XXXX |
| Mci Worldcom Communications | Will | Joliet, IL | +1 (815) 272-XXXX |
| Gallatin River Communications DBA Centurylink | Carroll | Savanna, IL | +1 (815) 273-XXXX |
| New Cingular Wireless PCS | Will | Joliet, IL | +1 (815) 274-XXXX |
| Cellco Partnership DBA Verizon Wireless | Stephenson | Freeport, IL | +1 (815) 275-XXXX |
| Teleport Communications Group - Chicago | Mchenry | Crystal Lake, IL | +1 (815) 276-XXXX |
| Teleport Communications Group - Chicago | Will | Frankfort, IL | +1 (815) 277-XXXX |
| Cellco Partnership DBA Verizon Wireless | Kankakee | Kankakee, IL | +1 (815) 278-XXXX |
| American Messaging (am) | Kankakee | Kankakee, IL | +1 (815) 279-XXXX |
| Teleport Communications Group - Chicago | Will | Joliet, IL | +1 (815) 280-XXXX |
