---
title: "Area code 320: Minnesota, United States"
url: "https://lookvalid.com/area-code/320.md"
canonical_url: "https://lookvalid.com/area-code/320"
last_updated: "2026-10-23"
type: "reference"
summary: "Area code 320 serves Minnesota, United States. Number formats, numbering rules, a live phone validator and the other codes in Minnesota."
---

# Area code 320: Minnesota, United States

Area code 320 serves Minnesota, United States. Number formats, numbering rules, a live phone validator and the other codes in Minnesota.

NANPA lists 510 central office codes (prefixes) in use in area code 320, held by 77 holders across 145 rate centers.
Onvoy holds the most prefixes, 58 (11%). 72% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
The FCC unwanted-call data has 1,374 complaints on file for 1,034 numbers in 320, most often filed as "Unwanted Calls". These are consumer reports, not findings.

## Facts

- 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

| 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% |

## Carriers

| 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.

## History

- 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.

## Nearest area codes

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).

## ZIP codes

133 ZIP codes fall in places that have a rate center in this area code. The places with the most are Saint Cloud, MN (11 ZIP codes), Howard Lake, MN (2 ZIP codes) and Albany, MN (1 ZIP code). A ZIP code and an area code are unrelated systems, so a ZIP code can sit in more than one area code and an area code spans many ZIP codes.

## Complaints on file

1,374 complaints for 1,034 numbers. Numbers whose latest complaint falls in each year:

- 2023: 65
- 2024: 108
- 2025: 48

## Questions

### 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.

Sources: NANPA central office code report dated 2026-10-17; NANPA NPA report dated 2026-10-18; FCC unwanted-call complaints, data fetched 2026-10-17; ZIP code places from GeoNames (CC BY 4.0).