CallataGuidesArea code 667
Where 667 is, how it is dialed, which carriers hold its numbers and how many of its codes are in use, from NANPA's 10/01/2026 files.
- State
- MD
- In service
- 2012
- Assigned codes
- 452of 800 possible
- Carriers
- 48
About area code 667
Area code 667 is a geographic area code in Maryland, in service since March 24, 2012, according to the North American Numbering Plan Administrator (NANPA). It is an overlay: 667 and 410 and 443 cover the same territory, so neighbors on the same street can have different area codes. It is in the Eastern time zone. The places with the most assigned exchanges include Baltimore, Aberdeen, Salisbury, Annapolis, and Bel Air. By population, its largest named places are Baltimore, Annapolis, Salisbury, Westminster, and Aberdeen.
| Item | Value |
|---|---|
| State | Maryland |
| In service since | March 24, 2012 |
| Assigned by NANPA | January 3, 2001 |
| Overlay | Yes, with 410, 443 |
| Parent area code (NANPA) | 443 |
| Time zone | Eastern |
| Local calls within the code | ten digits (area code plus number) |
| Assigned central office codes | 452 |
| Rate centers with codes | 102 |
| Carriers holding codes | 48 |
| Pooled codes | 452 |
| Codes assigned since 2020 | 295 |
| Relief planning in progress | No |
Source: NANPA NPA report and utilized central office code file, both dated 10/01/2026.
Cities and towns in area code 667
667 holds 12% of the 3,730 central office codes assigned in Maryland, the 5th most of the state's 6 codes. 50 Census places could be matched to rate centers with 667 exchanges; the most populous are Baltimore (568,000), Annapolis (40,689), Salisbury (33,616), and Westminster (20,662). Each place page lists the exact prefixes and carriers for that town.
| Place | Population (2024) | Area codes | Exchanges | Carriers |
|---|---|---|---|---|
| Baltimore, MD | 568,271 | 301, 410, 443, 667 | 451 | 44 |
| Annapolis, MD | 40,689 | 410, 443, 667 | 92 | 16 |
| Salisbury, MD | 33,616 | 410, 443, 667 | 67 | 32 |
| Westminster, MD | 20,662 | 410, 443, 667 | 28 | 14 |
| Aberdeen, MD | 18,451 | 410, 443, 667 | 44 | 9 |
| Easton, MD | 17,381 | 410, 443, 667 | 26 | 11 |
| Elkton, MD | 15,977 | 410, 443, 667 | 28 | 13 |
| Havre de Grace, MD | 15,222 | 410, 443, 667 | 8 | 5 |
| Cambridge, MD | 13,262 | 410, 443, 667 | 16 | 9 |
| Bel Air, MD | 10,395 | 410, 443, 667 | 37 | 13 |
| Taneytown, MD | 8,293 | 410, 443, 667 | 5 | 5 |
| Ocean City, MD | 6,884 | 410, 443, 667 | 12 | 7 |
| Hampstead, MD | 6,288 | 410, 443, 667 | 9 | 7 |
| Chestertown, MD | 5,702 | 410, 443, 667 | 10 | 6 |
| Berlin, MD | 5,349 | 410, 443, 667 | 9 | 7 |
Population: Census Vintage 2024 estimates for the matched place. Exchanges and carriers: NANPA utilized code file.
Ten-digit and seven-digit dialing in 667
According to NANPA's dialing-plan data, local calls within 667 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits. Because local calls need the area code, business cards, signage and website copy should always show the full ten-digit number. NANPA's dialing-plan note for this code reads: "1+10 digit permissible at service provider discretion."
Who holds 667 exchanges
48 carriers hold the 452 central office codes assigned in 667. Onvoy, LLC - MD has the most, with 84 (19%). 452 of the codes (100%) are pooled, meaning the code holder shares blocks of 1,000 numbers with other carriers instead of using all 10,000 itself. The code holder is not necessarily the carrier serving a given number today, since numbers can be ported between providers.
| Carrier (NANPA operating company) | Exchanges | Share |
|---|---|---|
| Onvoy, LLC - MD | 84 | 19% |
| New Cingular Wireless PCS, LLC - DC | 58 | 13% |
| Omnipoint Communications Cap Operations, LLC | 56 | 12% |
| Core Communications, Inc.- MD | 41 | 9.1% |
| Cellco Partnership d/b/a Verizon Wireless - MD | 24 | 5.3% |
| Ton80 Communications, LLC | 21 | 4.6% |
| Bandwidth.com CLEC, LLC - MD | 16 | 3.5% |
| Onvoy Spectrum, LLC | 15 | 3.3% |
| Teleport Communications America, LLC - MD | 8 | 1.8% |
| Nuso, LLC | 8 | 1.8% |
| Commio, LLC | 8 | 1.8% |
| Boost Subscriberco L.l.c. | 8 | 1.8% |
Carrier names are the operating company (OCN) names on NANPA's utilized central office code file dated 10/01/2026. A carrier holding a code may port numbers to other carriers.
Local calling areas in 667
NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 667 has codes in 102 rate centers. Rate center names in the file are abbreviations; where one matches a Census place, the table links to that city's local-number page.
| Rate center (NANPA) | Place | Codes |
|---|---|---|
| BALTIMORE | Baltimore, MD | 76 |
| ABERDEEN | Aberdeen, MD | 24 |
| PIKESVILLE | not matched | 24 |
| SALISBURY | Salisbury, MD | 23 |
| ANNAPOLIS | Annapolis, MD | 17 |
| COLUMBIA | not matched | 13 |
| CATONSVL | not matched | 13 |
| TOWSON | not matched | 11 |
| BEL AIR | Bel Air, MD | 8 |
| GLENBURNIE | not matched | 8 |
| ODENTON | not matched | 8 |
| ELKTON | Elkton, MD | 7 |
| PRINCEFRCK | not matched | 6 |
| ESSEX | not matched | 6 |
| PARKVILLE | not matched | 6 |
| WESTMINSTR | Westminster, MD | 5 |
| CAMBRIDGE | Cambridge, MD | 5 |
| SEVERN | not matched | 5 |
| ARGRGBSNIS | not matched | 4 |
| CENTREVL | Centreville, MD | 4 |
| OXFORD | Oxford, MD | 4 |
| DUNDALK | not matched | 4 |
| ELKRIDGE | not matched | 4 |
| ELLICOTTCY | not matched | 4 |
| CROFTON | not matched | 4 |
Top 25 of 102 rate centers.
Number supply in 667
An area code has 800 possible central office codes that start with 2 through 9, a few of which are reserved (such as N11 service codes and 555). 452 are assigned in 667, 57% of 800. 295 were assigned in 2020 or later.
| Decade assigned | Exchanges | Share |
|---|---|---|
| 2010s | 144 | 33% |
| 2020s | 295 | 67% |
Assignment dates as recorded in NANPA's utilized code file; codes without a recorded date are excluded.
A local 667 number on Callata
Callata Office costs $99 per month for up to 5 people, and each additional user is $20 a month. That covers up to 3 local numbers, calling from a browser or your cell, transcribed voicemail, recorded calls with AI summaries, after-hours routing and E911 on each number.
Porting a number you already use in area code 667 is free, and business texting is available once the carrier registration (10DLC) is approved; the registration carries a one-time $49 fee. Which specific numbers are open in a given area code depends on carrier inventory at the time you sign up.
AI agents are optional: an AI receptionist or scheduler can pick up when the team is busy or closed, take a message, send a text or email, or transfer the call. They draw on prepaid AI minutes ($0.25/minute), disclose that they are AI, and outbound AI calls require prior consent and are limited to 8am–9pm.
Frequently asked questions
Where is area code 667?
667 is a geographic area code in Maryland. Places with the most assigned exchanges include Baltimore, Aberdeen, Salisbury, and Annapolis.
What time zone is area code 667 in?
NANPA lists 667 in the Eastern time zone.
When did area code 667 go into service?
NANPA records an in-service date of March 24, 2012. The code was assigned on January 3, 2001.
Is 667 an overlay area code?
Yes. It shares its territory with 410 and 443.
Can my business get a 667 phone number?
Callata includes up to 3 local numbers on its $99/month plan (5 users included). Which 667 numbers are open depends on carrier inventory when you choose, and you can port an existing number for free.