Area code 410 – Maryland
410 has served Maryland since 1991, split from 301. All but a handful of its 786 number blocks are allocated (783 of 786), so it is effectively exhausted. Verizon holds 77.5% of those blocks, which is unusually concentrated for a US area code. It shares its geography with overlay codes 443, 667, so local calls take all ten digits. FTC complaints naming a 410 caller ID totalled 662 in the 33 days to 30 October 2026 (153rd of 422 ranked codes).
- State
- Maryland
- In service since
- 1991
- Time zone
- Eastern
Who holds 410 number blocks
Share of the 783 assigned NXX blocks (99.6% of the 786 possible), across 27 carriers. This is share of number blocks, not of subscribers.
- Verizon77.5%
- AT&T8.4%
- Spok3.6%
- T-Mobile3.6%
- Lumen2%
- Other CLEC / VoIP1.8%
- Windstream1.5%
- Bandwidth0.4%
- Comcast0.4%
- American Messaging0.3%
- Onvoy0.3%
- Charter0.1%
- Peerless0.1%
Spam complaints naming 410
FTC Do Not Call complaints where the caller ID was a 410 number, 28 Sep – 30 Oct 2026 (33 days). Caller IDs on spam calls are frequently spoofed, so these are complaints about the code, not calls proven to originate in it.
Rate centers in 410
NANPA allocates number blocks to rate centers and records their names abbreviated to ten characters, so these are NANPA's codes rather than place names – CHAMPAURBN is Champaign-Urbana, NWYRCYZN01 is a New York City zone. We show them unchanged instead of guessing at the full names. Showing the largest 5 of 102.
Timeline
- 1991 410 goes into service, split from or overlaid on 301.
More about 410
Separate pages for the questions that need their own answer: what time it is there, what the complaint data says, who holds the number blocks, and how the code compares with the one it shares its area with.
Frequently asked about 410
What state is area code 410?
Maryland. It covers the same area as 410/443/667.
Can I still get a 410 number?
Only from recycled stock. 783 of the 786 available blocks are already allocated, so new numbers in the area normally come from the overlay codes (410/443/667).
Is a call from 410 a scam?
Not by itself. 410 drew 662 FTC complaints in the 33 days to 30 October 2026, 153rd of 422 ranked codes – mid-pack or lower. Spam callers spoof caller IDs, so the only useful check is the full number.
Which carrier owns 410 numbers?
Verizon holds the largest share of assigned number blocks at 77.5%. The rest is spread across 3 other carriers. This is share of number blocks, not of subscribers – people keep their numbers when they switch carriers.
Do I need to dial 10 digits in 410?
Yes – ten digits for local calls in 410, because it shares its area with another code.
Sources and verification
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- NANPA – CO Code Assignment Records, All States (utilized), file updated 11/01/2026, retrieved Nov 1, 2026
- FTC – Do Not Call Reported Calls Data, 25 daily files 28 Sep – 30 Oct 2026, retrieved Nov 1, 2026
NANPA dialing note for this code: “10D”. Reviewed by the data desk. Spotted an error? Request a correction.