--- title: "Area code 210: Texas, United States" url: "https://lookvalid.com/area-code/210.md" canonical_url: "https://lookvalid.com/area-code/210" last_updated: "2026-10-23" type: "reference" summary: "Area code 210 serves Texas, United States. Number formats, numbering rules, a live phone validator and the other codes in Texas." --- # Area code 210: Texas, United States Area code 210 serves Texas, United States. Number formats, numbering rules, a live phone validator and the other codes in Texas. NANPA lists 784 central office codes (prefixes) in use in area code 210, held by 35 holders across 1 rate center. The largest rate center is SANANTONIO, with 784 prefixes (100%). Southwestern Bell holds the most prefixes, 280 (36%). 71% of the prefixes are pooled, which means their thousands-blocks can belong to different companies. The FCC unwanted-call data has 6,844 complaints on file for 4,745 numbers in 210, most often filed as "Unwanted Calls". These are consumer reports, not findings. ## Facts - In service since: 1992-11-01 - Time zone: Central (C) - Assigned overlays: 726 (2017-10-23) - Prefixes in use: 784 - Pooled prefixes: 559 (71%) - Rate centers: 1 - Companies holding prefixes: 35 - Assignment dates on file: 2001-01-29 to 2026-07-08 (321 prefixes) - ZIP codes in its places: 83 ## Rate centers | Rate center | Prefixes | Share | | --- | --- | --- | | SANANTONIO | 784 | 100% | ## Carriers | Holder | Prefixes | Share | | --- | --- | --- | | Southwestern Bell | 280 | 36% | | New Cingular Wireless PCS | 129 | 16% | | T-Mobile USA | 94 | 12% | | Verizon Wireless | 54 | 7% | | Mcimetro Access Transmission Services | 39 | 5% | | Onvoy | 37 | 5% | | 29 other carriers | 151 | 19% | A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company. ## History - 1947-01-01: Area code 512, named as the parent of 210 in the NANPA report, was in service. - 1992-11-01: Area code 210 went into service. - 1997-07-07: Area code 830 went into service and names 210 as its parent. - 1997-07-07: Area code 956 went into service and names 210 as its parent. - 2017-10-23: Area code 726 went into service as an overlay in the same area as 210. ## Nearest area codes The area codes closest to 210, measured between the centers of the ZIP code places they serve, are 830 (about 12 miles), 512 (about 76 miles), 737 (about 76 miles), 361 (about 103 miles) and 979 (about 136 miles). ## ZIP codes 83 ZIP codes fall in places that have a rate center in this area code. The places with the most are San Antonio, TX (83 ZIP codes). A ZIP code and an area code are unrelated systems, so a ZIP code can sit in more than one area code and an area code spans many ZIP codes. ## Complaints on file 6,844 complaints for 4,745 numbers. Numbers whose latest complaint falls in each year: - 2023: 143 - 2024: 151 - 2025: 149 ## Questions ### Where is area code 210? NANPA assigns area code 210 to Texas, United States. ### In which state does area code 210 sit? Texas. 210 is one of 29 area codes the NANPA table assigns to the state. ### Which places does area code 210 cover? The places with the most ZIP codes among the rate centers in 210 are San Antonio, TX. The rate center list on this page shows all of them. ### Who owns area code 210? NANPA assigns area codes. Within 210, Southwestern Bell holds the most prefixes, 280 prefixes or 36%. ### Which time zone does 210 use? The NANPA NPA report lists the time zone for 210 as Central (C). ### What year did 210 enter service? The NANPA NPA report gives an in-service date of 1992-11-01, so 210 has been in use since 1992. ### Does area code 210 have an overlay? Yes. 726 (in service 2017-10-23) shares the same area with 210, so numbers from all of them are local to each other. ### Which area codes are nearest to 210? The area codes closest to 210, measured between the centers of the ZIP code places they serve, are 830 (about 12 miles), 512 (about 76 miles), 737 (about 76 miles), 361 (about 103 miles) and 979 (about 136 miles). ### How many prefixes does area code 210 have? NANPA's report dated 2026-10-17 lists 784 prefixes in service in 210, spread over 1 rate center and 35 holders. ### Are there complaints about 210 numbers? The FCC data on file has 6,844 complaints for 4,745 numbers in 210. They are unverified consumer reports. A number with no complaints on file is not proven safe. Sources: NANPA central office code report dated 2026-10-17; NANPA NPA report dated 2026-10-18; FCC unwanted-call complaints, data fetched 2026-10-17; ZIP code places from GeoNames (CC BY 4.0).