--- title: "Area code 667: Maryland, United States" url: "https://lookvalid.com/area-code/667.md" canonical_url: "https://lookvalid.com/area-code/667" last_updated: "2026-10-23" type: "reference" summary: "Area code 667 serves Maryland, United States. Number formats, numbering rules, a live phone validator and the other codes in Maryland." --- # Area code 667: Maryland, United States Area code 667 serves Maryland, United States. Number formats, numbering rules, a live phone validator and the other codes in Maryland. NANPA lists 443 central office codes (prefixes) in use in area code 667, held by 47 holders across 102 rate centers. Onvoy holds the most prefixes, 82 (19%). 100% of the prefixes are pooled, which means their thousands-blocks can belong to different companies. The FCC unwanted-call data has 1,209 complaints on file for 906 numbers in 667, most often filed as "Unwanted Calls". These are consumer reports, not findings. ## Facts - In service since: 2012-03-24 - Time zone: Eastern (E) - Assigned overlays: 410 (1991-10-06), 443 (1997-06-01) - Prefixes in use: 443 - Pooled prefixes: 443 (100%) - Rate centers: 102 - Companies holding prefixes: 47 - Assignment dates on file: 2012-02-08 to 2026-08-05 (432 prefixes) - ZIP codes in its places: 127 ## Rate centers | Rate center | Prefixes | Share | | --- | --- | --- | | BALTIMORE | 74 | 17% | | PIKESVILLE | 24 | 5% | | ABERDEEN | 23 | 5% | | SALISBURY | 23 | 5% | | ANNAPOLIS | 16 | 4% | | CATONSVL | 12 | 3% | | COLUMBIA | 12 | 3% | | TOWSON | 11 | 2% | | 94 other rate centers | 248 | 56% | ## Carriers | Holder | Prefixes | Share | | --- | --- | --- | | Onvoy | 82 | 19% | | New Cingular Wireless PCS | 55 | 12% | | Omnipoint Communications Cap Operations | 55 | 12% | | Core Communications, Inc.- MD | 41 | 9% | | Verizon Wireless | 24 | 5% | | Ton80 Communications | 21 | 5% | | 41 other carriers | 165 | 37% | 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 - 1997-06-01: Area code 443, named as the parent of 667 in the NANPA report, was in service. - 2012-03-24: Area code 667 went into service. ## Nearest area codes The area codes closest to 667, measured between the centers of the ZIP code places they serve, are 301 (about 47 miles), 302 (about 47 miles), 571 (about 61 miles), 703 (about 61 miles) and 223 (about 73 miles). ## ZIP codes 127 ZIP codes fall in places that have a rate center in this area code. The places with the most are Baltimore, MD (42 ZIP codes), Annapolis, MD (8 ZIP codes) and Towson, MD (5 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 1,209 complaints for 906 numbers. Numbers whose latest complaint falls in each year: - 2023: 101 - 2024: 157 - 2025: 94 ## Questions ### Where is area code 667? NANPA assigns area code 667 to Maryland, United States. ### In which state does area code 667 sit? Maryland. 667 is one of 6 area codes the NANPA table assigns to the state. ### Which places does area code 667 cover? The places with the most ZIP codes among the rate centers in 667 are Baltimore, MD, Annapolis, MD and Towson, MD. The rate center list on this page shows all of them. ### Who owns area code 667? NANPA assigns area codes. Within 667, Onvoy holds the most prefixes, 82 prefixes or 19%. ### Which time zone does 667 use? The NANPA NPA report lists the time zone for 667 as Eastern (E). ### What year did 667 enter service? The NANPA NPA report gives an in-service date of 2012-03-24, so 667 has been in use since 2012. ### Does area code 667 have an overlay? Yes. 410 (in service 1991-10-06) and 443 (in service 1997-06-01) share the same area with 667, so numbers from all of them are local to each other. ### Which area codes are nearest to 667? The area codes closest to 667, measured between the centers of the ZIP code places they serve, are 301 (about 47 miles), 302 (about 47 miles), 571 (about 61 miles), 703 (about 61 miles) and 223 (about 73 miles). ### How many prefixes does area code 667 have? NANPA's report dated 2026-10-17 lists 443 prefixes in service in 667, spread over 102 rate centers and 47 holders. ### Are there complaints about 667 numbers? The FCC data on file has 1,209 complaints for 906 numbers in 667. 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).