Area code
320
320 is a United States area code. Under the North American Numbering Plan it belongs to Minnesota, which has 8 area codes in total.
Validate a number in 320
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 320 at a glance
NANPA lists 510 central office codes (prefixes) in use in area code 320, held by 77 holders across 145 rate centers.
| Fact | Value |
|---|---|
| In service since | 1996-03-17 |
| Time zone | Central (C) |
| Prefixes in use | 510 |
| Pooled prefixes | 368 (72%) |
| Rate centers | 145 |
| Companies holding prefixes | 77 |
| Assignment dates on file | 2001-02-05 to 2026-03-30 (255 prefixes) |
| ZIP codes in its places | 133 |
Rate centers in area code 320
| Rate center | Prefixes | Share |
|---|---|---|
| ST CLOUD | 85 | 17% |
| ALEXANDRIA | 18 | 4% |
| WILLMAR | 18 | 4% |
| LITTLE FLS | 13 | 3% |
| HUTCHINSON | 11 | 2% |
| PINE CITY | 10 | 2% |
| LITCHFIELD | 9 | 2% |
| BRAHAM | 8 | 2% |
| 137 other rate centers | 338 | 66% |
Who holds the prefixes in 320
Onvoy holds the most prefixes, 58 (11%). 72% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| Holder | Prefixes | Share |
|---|---|---|
| Onvoy | 58 | 11% |
| Verizon Wireless | 57 | 11% |
| Qwest | 42 | 8% |
| New Cingular Wireless PCS | 28 | 5% |
| Citizens Telecom CO Mn-Frontier Citizens Com-Mn | 27 | 5% |
| Centurylink Of Minnesota | 24 | 5% |
| 71 other carriers | 274 | 54% |
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 320
- 1947-01-01 Area code 612, named as the parent of 320 in the NANPA report, was in service.
- 1996-03-17 Area code 320 went into service.
Area codes nearest to 320
Distance is measured between the centers of the ZIP code places each area code serves, so it is a rough guide.
ZIP codes in area code 320
133 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| Saint Cloud, MN | 11 |
| Howard Lake, MN | 2 |
| Albany, MN | 1 |
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 320 numbers
1,374 FCC complaints are on file for 1,034 numbers in 320, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 65 |
| 2024 | 108 |
| 2025 | 48 |
Other area codes in Minnesota
Minnesota is one state with 8 area codes in the NANPA table. 320 is one of them.
Next to 320 in the numbering table
These are the codes just before and after 320 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 320 was first assigned in Minnesota. 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 Minnesota next to a 320 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 320
Where is area code 320?
NANPA assigns area code 320 to Minnesota, United States.
In which state does area code 320 sit?
Minnesota. 320 is one of 8 area codes the NANPA table assigns to the state.
Which places does area code 320 cover?
The places with the most ZIP codes among the rate centers in 320 are Saint Cloud, MN, Howard Lake, MN and Albany, MN. The rate center list on this page shows all of them.
Who owns area code 320?
NANPA assigns area codes. Within 320, Onvoy holds the most prefixes, 58 prefixes or 11%.
Which time zone does 320 use?
The NANPA NPA report lists the time zone for 320 as Central (C).
What year did 320 enter service?
The NANPA NPA report gives an in-service date of 1996-03-17, so 320 has been in use since 1996.
Does area code 320 have an overlay?
The NANPA NPA report lists no other area code in an overlay with 320.
Which area codes are nearest to 320?
The area codes closest to 320, measured between the centers of the ZIP code places they serve, are 763 (about 55 miles), 952 (about 71 miles), 507 (about 104 miles), 651 (about 116 miles) and 218 (about 128 miles).
How many prefixes does area code 320 have?
NANPA's report dated 2026-10-17 lists 510 prefixes in service in 320, spread over 145 rate centers and 77 holders.
Are there complaints about 320 numbers?
The FCC data on file has 1,374 complaints for 1,034 numbers in 320. 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.