The 773 area code is a telephone area code serving Chicago, Illinois. To start a free reverse phone lookup, simply enter the full 10-digit number (including the 773 area code) below and access available caller information such as name, address, and more.
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Phone numbers with the 773 prefix originate from Chicago, Illinois, specifically the parts of the city outside of the downtown area known as the Loop and its innermost neighborhoods.
Area code 773 operates within an overlay system with other area codes. Originally, Chicago was served by area code 312. Area code 773 was introduced on October 12, 1996, to serve Chicago outside the downtown area, while 312 continued to serve the Loop and innermost neighborhoods. On August 10, 2007, it was announced that area code 872 would overlay both area codes 312 and 773, going into service on November 7, 2009. This means that 312, 773, and 872 all serve the same geographic region.
Area code 773 is a General Purpose Code which was placed in service on January 1, 1947.
Our reverse phone lookup will analyze the three-digit prefix of any 773 area code phone number and will show which telecommunications company and rate center it was initially assigned to. This prefix code data may help to determine the U.S. carrier, Illinois geographic region, and local calling area associated with the phone number.
| Company | Number of Prefixes |
|---|---|
| ILLINOIS BELL TEL CO | 246 |
| SPRINT SPECTRUM, L.P. | 82 |
| T-MOBILE USA, INC. | 63 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 57 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 45 |
| OVATION COMMUNICATIONS OF ILLINOIS, INC. | 27 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 22 |
| LEVEL 3 COMMUNICATIONS, LLC - IL | 21 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 10 |
| GLOBAL CROSSING LOCAL SERVICES, INC. - IL | 8 |
| XO ILLINOIS, INC. | 8 |
| RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 7 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 6 |
| AT&T - LOCAL | 5 |
| BANDWIDTH.COM CLEC, LLC - IL | 5 |
| COMCAST IP PHONE, LLC | 5 |
| FIRST COMMUNICATIONS, LLC - IL | 4 |
| FIRST COMMUNICATIONS, LLC | 3 |
| ONVOY, LLC | 2 |
| PEERLESS NETWORK OF ILLINOIS, LLC - IL | 2 |
| YMAX COMMUNICATIONS CORP. - IL | 2 |
| AIRUS, INC.- IL | 1 |
| AMERICAN MESSAGING SERVICES, LLC | 1 |
| PAETEC COMMUNICATIONS, INC. - IL | 1 |
| Rate Center | Number of Prefixes |
|---|---|
| CHICGOZN03 | 150 |
| CHICGOZN01 | 78 |
| CHICGOZN07 | 71 |
| CHICGOZN04 | 68 |
| CHICGOZN02 | 62 |
| CHICGOZN10 | 57 |
| CHICGOZN06 | 45 |
| CHICGOZN08 | 36 |
| CHICGOZN05 | 33 |
| CHICGOZN09 | 22 |
| CHICGOZN11 | 11 |
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