Area code
667
667 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 667
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 667 at a glance
NANPA lists 443 central office codes (prefixes) in use in area code 667, held by 47 holders across 102 rate centers.
| Fact | Value |
|---|---|
| In service since | 2012-03-24 |
| Time zone | Eastern (E) |
| Assigned overlays | 410 (1991-10-06), 443 (1997-06-01) |
| Prefixes in use | 443 |
| Pooled prefixes | 443 (100%) |
| Rate centers | 102 |
| Companies holding prefixes | 47 |
| Assignment dates on file | 2012-02-08 to 2026-08-05 (432 prefixes) |
| ZIP codes in its places | 127 |
Rate centers in area code 667
| Rate center | Prefixes | Share |
|---|---|---|
| BALTIMORE | 74 | 17% |
| PIKESVILLE | 24 | 5% |
| ABERDEEN | 23 | 5% |
| SALISBURY | 23 | 5% |
| ANNAPOLIS | 16 | 4% |
| CATONSVL | 12 | 3% |
| COLUMBIA | 12 | 3% |
| TOWSON | 11 | 2% |
| 94 other rate centers | 248 | 56% |
Who holds the prefixes in 667
Onvoy holds the most prefixes, 82 (19%). 100% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| Holder | Prefixes | Share |
|---|---|---|
| Onvoy | 82 | 19% |
| New Cingular Wireless PCS | 55 | 12% |
| Omnipoint Communications Cap Operations | 55 | 12% |
| Core Communications, Inc.- MD | 41 | 9% |
| Verizon Wireless | 24 | 5% |
| Ton80 Communications | 21 | 5% |
| 41 other carriers | 165 | 37% |
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 667
- 1997-06-01 Area code 443, named as the parent of 667 in the NANPA report, was in service.
- 2012-03-24 Area code 667 went into service.
Area codes nearest to 667
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 667
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 667 numbers
1,209 FCC complaints are on file for 906 numbers in 667, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 101 |
| 2024 | 157 |
| 2025 | 94 |
Other area codes in Maryland
Maryland is one state with 6 area codes in the NANPA table. 667 is one of them.
Next to 667 in the numbering table
These are the codes just before and after 667 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 667 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 667 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 667
Where is area code 667?
NANPA assigns area code 667 to Maryland, United States.
In which state does area code 667 sit?
Maryland. 667 is one of 6 area codes the NANPA table assigns to the state.
Which places does area code 667 cover?
The places with the most ZIP codes among the rate centers in 667 are Baltimore, MD, Annapolis, MD and Towson, MD. The rate center list on this page shows all of them.
Who owns area code 667?
NANPA assigns area codes. Within 667, Onvoy holds the most prefixes, 82 prefixes or 19%.
Which time zone does 667 use?
The NANPA NPA report lists the time zone for 667 as Eastern (E).
What year did 667 enter service?
The NANPA NPA report gives an in-service date of 2012-03-24, so 667 has been in use since 2012.
Does area code 667 have an overlay?
Yes. 410 (in service 1991-10-06) and 443 (in service 1997-06-01) share the same area with 667, so numbers from all of them are local to each other.
Which area codes are nearest to 667?
The area codes closest to 667, 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 667 have?
NANPA's report dated 2026-10-17 lists 443 prefixes in service in 667, spread over 102 rate centers and 47 holders.
Are there complaints about 667 numbers?
The FCC data on file has 1,209 complaints for 906 numbers in 667. 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.