Area code
645
645 is a United States area code. Under the North American Numbering Plan it belongs to Florida, which has 23 area codes in total.
Validate a number in 645
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 645 at a glance
NANPA lists 75 central office codes (prefixes) in use in area code 645, held by 18 holders across 5 rate centers.
| Fact | Value |
|---|---|
| In service since | 2023-08-04 |
| Time zone | Eastern (E) |
| Assigned overlays | 305 (1947-01-01), 786 (1998-03-01) |
| Prefixes in use | 75 |
| Pooled prefixes | 73 (97%) |
| Rate centers | 5 |
| Companies holding prefixes | 18 |
| Assignment dates on file | 2023-10-19 to 2026-06-08 (75 prefixes) |
| ZIP codes in its places | 104 |
Rate centers in area code 645
The largest rate center is MIAMI, with 37 prefixes (49%).
| Rate center | Prefixes | Share |
|---|---|---|
| MIAMI | 37 | 49% |
| NORTH DADE | 14 | 19% |
| HOMESTEAD | 9 | 12% |
| KEYS | 8 | 11% |
| PERRINE | 7 | 9% |
Who holds the prefixes in 645
New Cingular Wireless PCS holds the most prefixes, 17 (23%). 97% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| Holder | Prefixes | Share |
|---|---|---|
| New Cingular Wireless PCS | 17 | 23% |
| Onvoy | 13 | 17% |
| Wide Voice | 9 | 12% |
| Eon Telecom | 5 | 7% |
| IP Horizon | 5 | 7% |
| Omnipoint Miami E License | 5 | 7% |
| 12 other carriers | 21 | 28% |
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 645
- 1947-01-01 Area code 305, named as the parent of 645 in the NANPA report, was in service.
- 2023-08-04 Area code 645 went into service.
Area codes nearest to 645
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 645
104 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| Miami, FL | 95 |
| Homestead, FL | 9 |
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 645 numbers
242 FCC complaints are on file for 235 numbers in 645, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 0 |
| 2024 | 31 |
| 2025 | 115 |
Other area codes in Florida
Florida is one state with 23 area codes in the NANPA table. 645 is one of them.
Next to 645 in the numbering table
These are the codes just before and after 645 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 645 was first assigned in Florida. 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 Florida next to a 645 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 645
Where is area code 645?
NANPA assigns area code 645 to Florida, United States.
In which state does area code 645 sit?
Florida. 645 is one of 23 area codes the NANPA table assigns to the state.
Which places does area code 645 cover?
The places with the most ZIP codes among the rate centers in 645 are Miami, FL and Homestead, FL. The rate center list on this page shows all of them.
Who owns area code 645?
NANPA assigns area codes. Within 645, New Cingular Wireless PCS holds the most prefixes, 17 prefixes or 23%.
Which time zone does 645 use?
The NANPA NPA report lists the time zone for 645 as Eastern (E).
What year did 645 enter service?
The NANPA NPA report gives an in-service date of 2023-08-04, so 645 has been in use since 2023.
Does area code 645 have an overlay?
Yes. 305 (in service 1947-01-01) and 786 (in service 1998-03-01) share the same area with 645, so numbers from all of them are local to each other.
Which area codes are nearest to 645?
The area codes closest to 645, measured between the centers of the ZIP code places they serve, are 754 (about 19 miles), 954 (about 19 miles), 561 (about 54 miles), 728 (about 54 miles) and 239 (about 105 miles).
How many prefixes does area code 645 have?
NANPA's report dated 2026-10-17 lists 75 prefixes in service in 645, spread over 5 rate centers and 18 holders.
Are there complaints about 645 numbers?
The FCC data on file has 242 complaints for 235 numbers in 645. 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.