The 410 area code covers Baltimore, Towson and 90 more places in Maryland.
Area code 410 is in Maryland, on Eastern Time. In the 410 area, phone numbers are given out most in Baltimore County, then the City of Baltimore and Anne Arundel County. It has been in service since October 6, 1991. 443 and 667 cover the same area, so two neighbours can have different area codes.
- Where
- 8 counties in Maryland, mostly Baltimore County, City of Baltimore and Anne Arundel County
- Time zone
- Eastern Time
- In service since
- October 6, 1991
- Shares its area with
- 443 (since 1997) and 667 (since 2012)
- Prefixes in use
- 783
- How to dial
- Local calls need all 10 digits: 410-555-0142.
Find out who called you from a 410 number.
Enter the full 10-digit number to see who it is listed to and the city and state on the listing. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup. To see whether it is a mobile, a landline or a VoIP line, use our free VoIP checker. To see which carrier a (410) number is on today, use our free carrier lookup.
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Baltimore holds 24% of the phone prefixes in area code 410.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 783 prefixes in use shows where 410 numbers are actually given out.
- Baltimore189 prefixes, 24%
- Towson53 prefixes, 7%
- Annapolis36 prefixes, 5%
- Catonsville35 prefixes, 4%
- Glen Burnie29 prefixes, 4%
- Salisbury24 prefixes, 3%
- Elkridge20 prefixes, 3%
- Columbia20 prefixes, 3%
Also served: Pikesville, Severna Park, Ellicott City and Cockeysville and 80 smaller places.
Of the carriers named here, AT&T Mobility holds the most phone number prefixes in area code 410: 51 of 783.
NANPA, which runs the North American numbering plan, assigns each prefix (the three digits after the area code) to one carrier. Here is how the 783 prefixes in use in 410 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| AT&T MobilityMobile network | 51 | 7% |
| SpokPaging network | 28 | 4% |
| T-MobileMobile network | 22 | 3% |
| Level 3 (Lumen)Lumen's business and wholesale network | 15 | 2% |
| Teleport (AT&T)AT&T's business phone network | 15 | 2% |
| PAETEC (Windstream)Windstream's business phone network | 12 | 2% |
| 18 other carriers | 640 | 82% |
48% of these prefixes are pooled, which means the blocks of 1,000 numbers inside them can belong to other carriers. Any number can also have been moved to another carrier since, so this shows who holds the prefixes, not who serves a given number.
Want the carrier of one exact number? Our free carrier lookup checks it, because numbers move between carriers.
Source: NANPA central office code assignments, October 1, 2026.
410 has been overlaid once since 1991.
1991
410 starts on October 6, 1991, split off from 301.
1997
On June 1, 1997, 443 is added on top of 410, so new numbers here can get either code.
A 410 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
The area codes closest to 410 are 302, 202 and 703.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
These are the questions people ask most about area code 410.
Where is area code 410?
410 covers Baltimore, Towson, Annapolis and Catonsville and 88 more places in Maryland. In the 410 area, phone numbers are given out most in Baltimore County, then the City of Baltimore and Anne Arundel County.
What state is area code 410 in?
Maryland. 410 is a Maryland area code on Eastern Time.
What cities use area code 410?
The places holding the most 410 prefixes are Baltimore, Towson, Annapolis, Catonsville, Glen Burnie, Salisbury, Elkridge and Columbia, out of 92 places in all. The count comes from NANPA's prefix assignments as of October 1, 2026.
Which phone company owns area code 410?
No single phone company owns 410. NANPA's records list its 783 prefixes across many carriers, and the ones named on this page include AT&T Mobility, Spok and T-Mobile. Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 410 in?
410 is on Eastern Time.
When did area code 410 start?
410 went into service on October 6, 1991, when it was split off from 301.
Is 410 the same area as 443 and 667?
Yes. 443 (since 1997) and 667 (since 2012) cover the same ground as 410. Nobody's number changed when they were added; new lines simply get whichever code has numbers left, so two neighbours can have different codes.
How do I dial a 410 number?
Local calls need all 10 digits: 410-555-0142.
Is 410 a toll-free number?
No. 410 is a regular area code for Baltimore and Towson in Maryland, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
What area codes are near 410?
The closest are 302 (Wilmington, Delaware), 202/771 (Washington, D.C.), 703/571 (Washington, D.C. suburbs, Virginia) and 856 (Camden, New Jersey), measured between the centres of each area.
Who called me from a 410 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 410 a scam?
410 is a real Maryland area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Put this lookup on your site: our free area code widget takes two lines of code and shows any US area code's state, time zone and local time.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.