--- title: "Area code 410: Maryland, United States" url: "https://lookvalid.com/area-code/410.md" canonical_url: "https://lookvalid.com/area-code/410" last_updated: "2026-10-23" type: "reference" summary: "Area code 410 serves Maryland, United States. Number formats, numbering rules, a live phone validator and the other codes in Maryland." --- # Area code 410: Maryland, United States Area code 410 serves Maryland, United States. Number formats, numbering rules, a live phone validator and the other codes in Maryland. NANPA lists 783 central office codes (prefixes) in use in area code 410, held by 26 holders across 102 rate centers. Verizon Maryland holds the most prefixes, 507 (65%). 48% of the prefixes are pooled, which means their thousands-blocks can belong to different companies. The FCC unwanted-call data has 5,630 complaints on file for 4,195 numbers in 410, most often filed as "Unwanted Calls". These are consumer reports, not findings. ## Facts - In service since: 1991-10-06 - Time zone: Eastern (E) - Assigned overlays: 443 (1997-06-01), 667 (2012-03-24) - Prefixes in use: 783 - Pooled prefixes: 377 (48%) - Rate centers: 102 - Companies holding prefixes: 26 - Assignment dates on file: 2001-04-18 to 2023-07-19 (46 prefixes) - ZIP codes in its places: 127 ## Rate centers | Rate center | Prefixes | Share | | --- | --- | --- | | BALTIMORE | 189 | 24% | | TOWSON | 53 | 7% | | ANNAPOLIS | 36 | 5% | | CATONSVL | 35 | 4% | | GLENBURNIE | 29 | 4% | | SALISBURY | 24 | 3% | | WATERLO236 | 23 | 3% | | COLUMBIA | 20 | 3% | | 94 other rate centers | 374 | 48% | ## Carriers | Holder | Prefixes | Share | | --- | --- | --- | | Verizon Maryland | 507 | 65% | | Verizon Wireless | 53 | 7% | | New Cingular Wireless PCS | 51 | 7% | | Mcimetro Access Transmission Services | 47 | 6% | | Spok | 28 | 4% | | Omnipoint Communications Cap Operations | 22 | 3% | | 20 other carriers | 75 | 10% | 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 301, named as the parent of 410 in the NANPA report, was in service. - 1991-10-06: Area code 410 went into service. - 1997-06-01: Area code 443 went into service as an overlay in the same area as 410. ## Nearest area codes The area codes closest to 410, 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 5,630 complaints for 4,195 numbers. Numbers whose latest complaint falls in each year: - 2023: 137 - 2024: 117 - 2025: 123 ## Questions ### Where is area code 410? NANPA assigns area code 410 to Maryland, United States. ### In which state does area code 410 sit? Maryland. 410 is one of 6 area codes the NANPA table assigns to the state. ### Which places does area code 410 cover? The places with the most ZIP codes among the rate centers in 410 are Baltimore, MD, Annapolis, MD and Towson, MD. The rate center list on this page shows all of them. ### Who owns area code 410? NANPA assigns area codes. Within 410, Verizon Maryland holds the most prefixes, 507 prefixes or 65%. ### Which time zone does 410 use? The NANPA NPA report lists the time zone for 410 as Eastern (E). ### What year did 410 enter service? The NANPA NPA report gives an in-service date of 1991-10-06, so 410 has been in use since 1991. ### Does area code 410 have an overlay? Yes. 443 (in service 1997-06-01) and 667 (in service 2012-03-24) share the same area with 410, so numbers from all of them are local to each other. ### Which area codes are nearest to 410? The area codes closest to 410, 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 410 have? NANPA's report dated 2026-10-17 lists 783 prefixes in service in 410, spread over 102 rate centers and 26 holders. ### Are there complaints about 410 numbers? The FCC data on file has 5,630 complaints for 4,195 numbers in 410. 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).