Illinois, United States
Central Time
6:29 AM
Area Code
779
State / Province
Illinois
Country
United States
Time Zone
Central Time
Area code 779 covers 139 cities and communities across Illinois, based on telephone company rate center data.
Use the E.164 format for clickable phone links (RFC 3966):
<a href="tel:+17795550100">+17795550100</a><a href="tel:+17795550199">+17795550199</a>Look up which exchange in Illinois a specific 779 number is homed to, and whether its block is wireline or wireless. See what a reverse lookup can establish before relying on the answer.
348 active prefixes in this area code, assigned as 2,897 thousands-blocks — pooling splits one prefix across several carriers, so each block is listed separately with the rate centre it is homed to, its carrier of record, and the switch that serves it.
Showing blocks 1–100 of 2,897
| NPA-NXX | Block | Rate centre | Type | Carrier (OCN) | Switch | LATA | LIR | Dates |
|---|---|---|---|---|---|---|---|---|
| 779-200 | 0 | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-200 | 1 | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-200 | 2 | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-200 | 3 | Rockford | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - IL (6115) | RCFRILRCJMD | 360 | — | — |
| 779-200 | 4 | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-200 | 5 | Rockford | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | RCFRILRTTMD | 360 | — | — |
| 779-200 | 6 | Rockford | Landline or VoIP | TERRA NOVA TELECOM INC. (145J) | — | 360 | — | — |
| 779-200 | 7 | Rockford | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | RCFRILRTTMD | 360 | — | — |
| 779-200 | A | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-201 | 0 | La Salle | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RVDLILBDAMD | 358 | — | — |
| 779-201 | 1 | La Salle | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - IL (984E) | CHCGILWBXDZ | 358 | — | — |
| 779-201 | 2 | La Salle | Landline or VoIP | PAETEC ITEL, LLC (829J) | CHCGILWBXWZ | 358 | — | — |
| 779-201 | 3 | La Salle | Landline or VoIP | ONVOY, LLC (224C) | CHICAGO | 358 | — | — |
| 779-201 | 4 | La Salle | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - IL (984E) | CHCGILWBXDZ | 358 | — | — |
| 779-201 | 5 | La Salle | Landline or VoIP | COMCAST IP PHONE, LLC (318J) | CHCGILNEXJX | 358 | — | — |
| 779-201 | 6 | La Salle | Landline or VoIP | ONVOY, LLC (224C) | CHICAGO | 358 | — | — |
| 779-201 | 7 | La Salle | Landline or VoIP | CENTURYLINK COMMUNICATIONS, LLC (508J) | CHCGILDT8MD | 358 | — | — |
| 779-201 | 8 | La Salle | Landline or VoIP | PEERLESS NETWORK OF ILLINOIS, LLC - IL (063E) | CHICAGO | 358 | — | — |
| 779-201 | 9 | La Salle | Landline or VoIP | PEERLESS NETWORK OF ILLINOIS, LLC - IL (063E) | CHICAGO | 358 | — | — |
| 779-201 | A | La Salle | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RVDLILBDAMD | 358 | — | — |
| 779-202 | 0 | Galena | Landline or VoIP | ONVOY, LLC (224C) | DVNPIADTXQX | 634 | — | — |
| 779-202 | 1 | Galena | Landline or VoIP | MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL (846F) | RCISILRIWMD | 634 | — | — |
| 779-202 | 2 | Galena | Landline or VoIP | ONVOY, LLC (224C) | DVNPIADTXQX | 634 | — | — |
| 779-202 | 3 | Galena | Landline or VoIP | ONVOY, LLC (224C) | DVNPIADTXQX | 634 | — | — |
| 779-202 | 4 | Galena | Landline or VoIP | ONVOY, LLC (224C) | DVNPIADTXQX | 634 | — | — |
| 779-202 | 5 | Galena | Landline or VoIP | ONVOY, LLC (224C) | DVNPIADTXQX | 634 | — | — |
| 779-202 | 6 | Galena | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - IL (7136) | RCISILRIXMD | 634 | — | — |
| 779-202 | 7 | Galena | Landline or VoIP | ONVOY, LLC (224C) | DVNPIADTXQX | 634 | — | — |
| 779-202 | 8 | Galena | Landline or VoIP | ONVOY, LLC (224C) | DVNPIADTXQX | 634 | — | — |
| 779-202 | 9 | Galena | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | DVNPIAEAXMD | 634 | — | — |
| 779-202 | A | Galena | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - IL (7136) | RCISILRIXMD | 634 | — | — |
| 779-203 | 8 | Rockford | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - IL (6115) | RCFRILRCJMD | 360 | — | — |
| 779-203 | 9 | Rockford | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - IL (6115) | RCFRILRCJMD | 360 | — | — |
| 779-203 | A | Rockford | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - IL (6115) | RCFRILRCJMD | 360 | — | — |
| 779-204 | 0 | Verona | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - IL (984E) | CHCGILWBXDZ | 358 | — | — |
| 779-204 | 1 | Verona | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - IL (984E) | CHCGILWBXDZ | 358 | — | — |
| 779-204 | 2 | Verona | Landline or VoIP | ONVOY, LLC (224C) | CHICAGO | 358 | — | — |
| 779-204 | 3 | Verona | Landline or VoIP | ONVOY, LLC (224C) | CHICAGO | 358 | — | — |
| 779-204 | 4 | Verona | Landline or VoIP | ONVOY, LLC (224C) | CHICAGO | 358 | — | — |
| 779-204 | 5 | Verona | Landline or VoIP | ONVOY, LLC (224C) | CHICAGO | 358 | — | — |
| 779-204 | 6 | Verona | Landline or VoIP | ONVOY, LLC (224C) | CHICAGO | 358 | — | — |
| 779-204 | 7 | Verona | Landline or VoIP | ONVOY, LLC (224C) | CHICAGO | 358 | — | — |
| 779-204 | 8 | Verona | Landline or VoIP | TELNYX LLC (073H) | CHCGILWUJMD | 358 | — | — |
| 779-204 | 9 | Verona | Landline or VoIP | ONVOY, LLC (224C) | CHICAGO | 358 | — | — |
| 779-204 | A | Verona | Landline or VoIP | ONVOY, LLC (224C) | CHICAGO | 358 | — | — |
| 779-205 | 0 | Joliet | Landline or VoIP | PEERLESS NETWORK OF ILLINOIS, LLC - IL (063E) | CHICAGO | 358 | — | — |
| 779-205 | 1 | Joliet | Landline or VoIP | ONVOY, LLC (224C) | CHICAGO | 358 | — | — |
| 779-205 | 2 | Joliet | Landline or VoIP | ACCESS ONE, INC. - IL (5447) | CHCGILDTKMD | 358 | — | — |
| 779-205 | 3 | Joliet | Landline or VoIP | COMCAST IP PHONE, LLC (318J) | CHCGILNEXJX | 358 | — | — |
| 779-205 | 4 | Joliet | Landline or VoIP | ONVOY, LLC (224C) | CHICAGO | 358 | — | — |
| 779-205 | 5 | Joliet | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | BURGILAHGT3 | 358 | — | — |
| 779-205 | 6 | Joliet | Landline or VoIP | ONVOY, LLC (224C) | CHICAGO | 358 | — | — |
| 779-205 | 7 | Joliet | Landline or VoIP | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL (7196) | ELK GROVE VILLAGE | 358 | — | — |
| 779-205 | 8 | Joliet | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | BURGILAHGT3 | 358 | — | — |
| 779-205 | 9 | Joliet | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | BURGILAHGT3 | 358 | — | — |
| 779-205 | A | Joliet | Wireless | NEW CINGULAR WIRELESS PCS, LLC - IL (6534) | BURGILAHGT3 | 358 | — | — |
| 779-206 | 0 | Joliet | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RVDLILBDAMD | 358 | — | — |
| 779-206 | 1 | Joliet | Landline or VoIP | IP HORIZON LLC (515J) | — | 358 | — | — |
| 779-206 | 2 | Joliet | Landline or VoIP | COMCAST IP PHONE, LLC (318J) | CHCGILNEXJX | 358 | — | — |
| 779-206 | 3 | Joliet | Landline or VoIP | ONVOY, LLC (224C) | CHICAGO | 358 | — | — |
| 779-206 | 4 | Joliet | Landline or VoIP | COMCAST IP PHONE, LLC (318J) | CHCGILNEXJX | 358 | — | — |
| 779-206 | 5 | Joliet | Wireless | T-MOBILE USA, INC. (6529) | ELGNILOTGT5 | 358 | — | — |
| 779-206 | 6 | Joliet | Wireless | T-MOBILE USA, INC. (6529) | ELGNILOTGT5 | 358 | — | — |
| 779-206 | 7 | Joliet | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - IL (984E) | CHCGILWBXDZ | 358 | — | — |
| 779-206 | 8 | Joliet | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RVDLILBDAMD | 358 | — | — |
| 779-206 | 9 | Joliet | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RVDLILBDAMD | 358 | — | — |
| 779-206 | A | Joliet | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RVDLILBDAMD | 358 | — | — |
| 779-207 | 0 | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-207 | 1 | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-207 | 2 | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-207 | 3 | Rockford | Landline or VoIP | ONVOY, LLC (224C) | RCFRILRTZMD | 360 | — | — |
| 779-207 | 4 | Rockford | Landline or VoIP | ONVOY, LLC (224C) | RCFRILRTZMD | 360 | — | — |
| 779-207 | 5 | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-207 | 6 | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-207 | 7 | Rockford | Landline or VoIP | ONVOY, LLC (224C) | RCFRILRTZMD | 360 | — | — |
| 779-207 | 8 | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-207 | 9 | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-207 | A | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-208 | 0 | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-208 | 1 | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-208 | 2 | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-208 | 3 | Rockford | Landline or VoIP | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL (7196) | RCFRILRTPMD | 360 | — | — |
| 779-208 | 4 | Rockford | Landline or VoIP | ONVOY, LLC (224C) | RCFRILRTZMD | 360 | — | — |
| 779-208 | 5 | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-208 | 6 | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-208 | 7 | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-208 | 8 | Rockford | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - IL (6115) | RCFRILRCJMD | 360 | — | — |
| 779-208 | 9 | Rockford | Landline or VoIP | METROPCS, INC. (5562) | RCFRILRCMMD | 360 | — | — |
| 779-208 | A | Rockford | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (6333) | RCFRILRTX5Y | 360 | — | — |
| 779-209 | 0 | Sandwich | Landline or VoIP | PEERLESS NETWORK OF ILLINOIS, LLC - IL (063E) | CHICAGO | 358 | — | — |
| 779-209 | 1 | Sandwich | Landline or VoIP | PEERLESS NETWORK OF ILLINOIS, LLC - IL (063E) | CHICAGO | 358 | — | — |
| 779-209 | 2 | Sandwich | Landline or VoIP | PEERLESS NETWORK OF ILLINOIS, LLC - IL (063E) | CHICAGO | 358 | — | — |
| 779-209 | 3 | Sandwich | Landline or VoIP | PEERLESS NETWORK OF ILLINOIS, LLC - IL (063E) | CHICAGO | 358 | — | — |
| 779-209 | 4 | Sandwich | Landline or VoIP | PEERLESS NETWORK OF ILLINOIS, LLC - IL (063E) | CHICAGO | 358 | — | — |
| 779-209 | 5 | Sandwich | Landline or VoIP | PEERLESS NETWORK OF ILLINOIS, LLC - IL (063E) | CHICAGO | 358 | — | — |
| 779-209 | 6 | Sandwich | Landline or VoIP | PEERLESS NETWORK OF ILLINOIS, LLC - IL (063E) | CHICAGO | 358 | — | — |
| 779-209 | 7 | Sandwich | Landline or VoIP | PEERLESS NETWORK OF ILLINOIS, LLC - IL (063E) | CHICAGO | 358 | — | — |
| 779-209 | 8 | Sandwich | Landline or VoIP | PEERLESS NETWORK OF ILLINOIS, LLC - IL (063E) | CHICAGO | 358 | — | — |
| 779-209 | 9 | Sandwich | Landline or VoIP | PEERLESS NETWORK OF ILLINOIS, LLC - IL (063E) | CHICAGO | 358 | — | — |
| 779-209 | A | Sandwich | Landline or VoIP | PEERLESS NETWORK OF ILLINOIS, LLC - IL (063E) | CHICAGO | 358 | — | — |
Block-level assignments from the North American Numbering Plan administrator, via localcallingguide.com.
Assigned Prefixes
348
Assignment Blocks
2,897
Rate Centers
139
Carriers of Record
45
| Type | Blocks | Share |
|---|---|---|
| Landline | 6 | 0% |
| Landline or VoIP | 1,624 | 56% |
| Wireless | 1,267 | 44% |
| Carrier | Blocks |
|---|---|
| ONVOY, LLC | 650 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 448 |
| T-MOBILE USA, INC. | 254 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 223 |
| UNITED STATES CELLULAR - IL | 172 |
| ONVOY SPECTRUM, LLC | 141 |
| STRATUS NETWORKS | 115 |
| BANDWIDTH.COM CLEC, LLC - IL | 113 |
| COMCAST IP PHONE, LLC | 75 |
| PEERLESS NETWORK OF ILLINOIS, LLC - IL | 75 |
| 35 other carriers | 631 |
Carrier of record for each block. Numbers ported to another carrier keep their original block assignment, so this is not a lookup of who serves a given number today.
| Rate Center | Prefixes | Blocks |
|---|---|---|
| Rockford | 42 | 380 |
| Joliet | 25 | 274 |
| Momence | 19 | 209 |
| De Kalb | 15 | 151 |
| Freeport | 12 | 124 |
| Kankakee | 9 | 97 |
| Woodstock | 9 | 89 |
| Frankfort | 8 | 79 |
| Forrest (Livingston) | 6 | 15 |
| McHenry | 6 | 60 |
| Plainfield | 6 | 60 |
| Sterling | 6 | 44 |
| Crystal Lake | 5 | 47 |
| South Beloit | 5 | 42 |
| Dixon | 4 | 25 |
| La Salle | 4 | 40 |
| Sandwich | 4 | 33 |
| Belvidere | 3 | 25 |
| Braidwood | 3 | 27 |
| Dwight | 3 | 32 |
| Galena | 3 | 32 |
| Lockport | 3 | 23 |
| Marengo | 3 | 26 |
| New Lenox | 3 | 24 |
| Oglesby | 3 | 25 |
| Pontiac | 3 | 24 |
| Streator | 3 | 32 |
| Sycamore | 3 | 31 |
| Wilmington | 3 | 33 |
| Cissna Park | 2 | 13 |
| Crescent City | 2 | 20 |
| Depue | 2 | 20 |
| Fairbury | 2 | 13 |
| Harvard | 2 | 17 |
| Lanark | 2 | 9 |
| Manteno | 2 | 18 |
| Mazon | 2 | 16 |
| Morris | 2 | 19 |
| New Milford | 2 | 21 |
| Onarga | 2 | 17 |
| Princeton | 2 | 16 |
| Rochelle | 2 | 14 |
| Spring Valley | 2 | 17 |
| Verona | 2 | 21 |
| Watseka | 2 | 13 |
| Wonder Lake | 2 | 17 |
| Ashton | 1 | 7 |
| Beaverville | 1 | 4 |
| Byron | 1 | 7 |
| Cabery | 1 | 3 |
| Capron | 1 | 5 |
| Cedar Point | 1 | 4 |
| Chadwick | 1 | 4 |
| Chatsworth | 1 | 4 |
| Cherry Valley | 1 | 4 |
| Coal City | 1 | 5 |
| Coleta | 1 | 7 |
| Creston | 1 | 6 |
| Danforth | 1 | 8 |
| Davis | 1 | 2 |
| Donovan | 1 | 7 |
| Durand | 1 | 5 |
| Elizabeth | 1 | 2 |
| Elwood | 1 | 7 |
| Emington | 1 | 3 |
| Flanagan | 1 | 6 |
| Forreston | 1 | 4 |
| Franklin Grove | 1 | 4 |
| Fulton | 1 | 6 |
| Garden Prairie | 1 | 3 |
| Genoa | 1 | 11 |
| German Valley | 1 | 4 |
| Grand Detour | 1 | 2 |
| Grand Ridge | 1 | 7 |
| Grant Park | 1 | 8 |
| Granville | 1 | 9 |
| Graymont | 1 | 7 |
| Hanover | 1 | 3 |
| Harding | 1 | 9 |
| Harmon | 1 | 2 |
| Herscher | 1 | 9 |
| Hinckley | 1 | 7 |
| Hooppole | 1 | 6 |
| Kempton | 1 | 7 |
| Kinsman | 1 | 4 |
| Kirkland | 1 | 5 |
| Leaf River | 1 | 1 |
| Leland | 1 | 9 |
| Lena | 1 | 6 |
| Lisbon | 1 | 9 |
| Long Point | 1 | 3 |
| Lostant | 1 | 6 |
| Magnolia | 1 | 5 |
| Malta | 1 | 4 |
| Manhattan | 1 | 7 |
| Maple Park | 1 | 5 |
| Martinton | 1 | 8 |
| Mendota | 1 | 7 |
| Milford | 1 | 8 |
| Minooka | 1 | 3 |
| Monroe Center | 1 | 9 |
| Mount Carroll | 1 | 2 |
| Mount Morris | 1 | 10 |
| Newark | 1 | 11 |
| Ohio | 1 | 4 |
| Paw Paw | 1 | 10 |
| Pecatonica | 1 | 6 |
| Piper City | 1 | 3 |
| Plattville | 1 | 4 |
| Polo | 1 | 1 |
| Poplar Grove | 1 | 3 |
| Reddick | 1 | 5 |
| Richmond | 1 | 6 |
| Rock Cut | 1 | 9 |
| Rockton | 1 | 7 |
| Roscoe | 1 | 11 |
| Rutland | 1 | 3 |
| Seward | 1 | 5 |
| Shabbona | 1 | 6 |
| Sheffield | 1 | 1 |
| Sheldon | 1 | 4 |
| Sheridan | 1 | 9 |
| South Sharon | 1 | 2 |
| Spring Grove | 1 | 8 |
| St Anne | 1 | 9 |
| Steward | 1 | 4 |
| Stockland | 1 | 3 |
| Stockton | 1 | 5 |
| Thomas (Bureau) | 1 | 4 |
| Toluca | 1 | 8 |
| Tonica | 1 | 3 |
| Union | 1 | 8 |
| Warren | 1 | 3 |
| Waterman | 1 | 5 |
| Wellington | 1 | 2 |
| Wenona | 1 | 4 |
| Winnebago | 1 | 9 |
| Winslow | 1 | 4 |
| Woodland | 1 | 5 |
A rate center is the telephone exchange area a number is homed to. It sets local calling boundaries, and is not the caller's current location.
Area code 779 is a North American Numbering Plan (NANP) telephone area code assigned to Illinois, United States. It is one of 17 area codes serving Illinois. As population and demand for phone numbers grew, the region was divided into multiple numbering plan areas to avoid exhausting the available 7-digit number pool.
Yes. 779 is an active North American Numbering Plan (NANP) area code, currently assigned to Illinois, United States. It is safe to answer or dial calls using this area code.
Area code 779 covers 139 cities and communities in Illinois, including Ashton, Beaverville, Belvidere, Braidwood, Byron, and 134 more localities. This is based on telephone company rate center data — the geographic areas carriers use to determine local calling boundaries and to assign numbers when a business or individual requests a phone number in a specific city.
All numbers in the 779 area code observe Central Time (IANA timezone: America/Chicago). Central Time is UTC−6 in winter (CST) and UTC−5 in summer (CDT). When placing a call to a 779 number from a different time zone, check the current local time above to avoid calling outside of business hours.
From within Illinois, dial the 7-digit local number directly if calling within the same rate center, or dial 1 + 779 + 7-digit number for long-distance calls within North America. From outside the US or Canada, dial your country's international exit code followed by 1 779 XXX XXXX. The country code for both the United States and Canada in NANP is +1.
Format 779 numbers using E.164 notation as required by RFC 3966: prefix with +1 and omit dashes and parentheses (e.g., +17795550100). This format ensures tel: links work correctly on all mobile browsers and VoIP apps. See the tel: URI formatting guide for complete examples.