Area code
410
410 is a United States area code. Under the North American Numbering Plan it belongs to Maryland, which has 6 area codes in total.
Validate a number in 410
Paste a full number and the tool checks it against the numbering plan. It returns the standard formats, the line type the plan assigns and the area code region.
Digits with or without punctuation work. Numbers outside the US are read with the +country code.
Area code 410 at a glance
NANPA lists 783 central office codes (prefixes) in use in area code 410, held by 26 holders across 102 rate centers.
| Fact | Value |
|---|---|
| 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 in area code 410
| 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% |
Who holds the prefixes in 410
Verizon Maryland holds the most prefixes, 507 (65%). 48% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| 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. Find which carrier a number is on, or browse the prefix holders.
History of area code 410
- 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.
Area codes nearest to 410
Distance is measured between the centers of the ZIP code places each area code serves, so it is a rough guide.
Overlay codes in the same area
ZIP codes in area code 410
127 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| Baltimore, MD | 42 |
| Annapolis, MD | 8 |
| Towson, MD | 5 |
A ZIP code and an area code are unrelated systems. A ZIP code can sit in more than one area code, and an area code spans many ZIP codes.
Complaints on file for 410 numbers
5,630 FCC complaints are on file for 4,195 numbers in 410, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 137 |
| 2024 | 117 |
| 2025 | 123 |
Other area codes in Maryland
Maryland is one state with 6 area codes in the NANPA table. 410 is one of them.
Next to 410 in the numbering table
These are the codes just before and after 410 when all are sorted by number. They are neighbours on the list, not necessarily on the map.
What the area code does and does not tell you
A number that starts with 410 was first assigned in Maryland. That is a fact about where the number began, and it is a useful hint when you check a form entry, for example a billing address in Maryland next to a 410 phone number.
It does not show where the person is today. A number stays with its owner after a move or a change of provider (number portability), and mobile numbers travel with the handset. The area code also cannot tell you whether the line is active, who the carrier is, or whether the number is mobile or fixed: the plan shares those ranges. Read more about the area code, the numbering plan and line type.
Check numbers in bulk with the API
| Product | Credits | Docs |
|---|---|---|
| Phone Numbering-Plan Validation | 1 credit per valid number | API docs |
| Phone Intelligence (carrier and line status) | 1 credit per check (invalid numbers outside the US and Canada are free) | Product page |
Questions about area code 410
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.
Area code assignments: North American Numbering Plan Administrator NPA report, file dated 10/17/2026, retrieved 2026-10-17. Source file. New codes are assigned several times a year. Prefixes, rate centers, holders, time zone, in-service date and overlays: NANPA central office code report dated 2026-10-17 and NPA report dated 2026-10-18. Complaints: FCC consumer complaints open data, fetched 2026-10-17. ZIP code places: Postal code places and coordinates: GeoNames (geonames.org), licensed CC BY 4.0.