Area code
531
531 is a United States area code. Under the North American Numbering Plan it belongs to Nebraska, which has 3 area codes in total.
Validate a number in 531
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 531 at a glance
NANPA lists 264 central office codes (prefixes) in use in area code 531, held by 39 holders across 104 rate centers.
| Fact | Value |
|---|---|
| In service since | 2011-03-26 |
| Time zone | Central (C) |
| Assigned overlays | 402 (1947-01-01) |
| Prefixes in use | 264 |
| Pooled prefixes | 264 (100%) |
| Rate centers | 104 |
| Companies holding prefixes | 39 |
| Assignment dates on file | 2013-02-13 to 2026-07-02 (252 prefixes) |
| ZIP codes in its places | 173 |
Rate centers in area code 531
| Rate center | Prefixes | Share |
|---|---|---|
| OMAHA | 83 | 31% |
| LINCOLN | 25 | 9% |
| AURORA | 10 | 4% |
| FREMONT | 5 | 2% |
| COLUMBUS | 4 | 2% |
| SOSIOUX CY | 4 | 2% |
| AINSWORTH | 3 | 1% |
| CRESTON | 3 | 1% |
| 96 other rate centers | 127 | 48% |
Who holds the prefixes in 531
Onvoy holds the most prefixes, 64 (24%). 100% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| Holder | Prefixes | Share |
|---|---|---|
| Onvoy | 64 | 24% |
| New Cingular Wireless PCS | 23 | 9% |
| Verizon Wireless | 23 | 9% |
| Teleport Communications America | 18 | 7% |
| Aerial Communications | 17 | 6% |
| United States Cellular | 15 | 6% |
| 33 other carriers | 104 | 39% |
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 531
- 1947-01-01 Area code 402, named as the parent of 531 in the NANPA report, was in service.
- 2011-03-26 Area code 531 went into service.
Area codes nearest to 531
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 531
173 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| Omaha, NE | 48 |
| Lincoln, NE | 29 |
| Blair, NE | 2 |
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 531 numbers
394 FCC complaints are on file for 340 numbers in 531, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 35 |
| 2024 | 43 |
| 2025 | 33 |
Other area codes in Nebraska
Nebraska is one state with 3 area codes in the NANPA table. 531 is one of them.
Next to 531 in the numbering table
These are the codes just before and after 531 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 531 was first assigned in Nebraska. 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 Nebraska next to a 531 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 531
Where is area code 531?
NANPA assigns area code 531 to Nebraska, United States.
In which state does area code 531 sit?
Nebraska. 531 is one of 3 area codes the NANPA table assigns to the state.
Which places does area code 531 cover?
The places with the most ZIP codes among the rate centers in 531 are Omaha, NE, Lincoln, NE and Blair, NE. The rate center list on this page shows all of them.
Who owns area code 531?
NANPA assigns area codes. Within 531, Onvoy holds the most prefixes, 64 prefixes or 24%.
Which time zone does 531 use?
The NANPA NPA report lists the time zone for 531 as Central (C).
What year did 531 enter service?
The NANPA NPA report gives an in-service date of 2011-03-26, so 531 has been in use since 2011.
Does area code 531 have an overlay?
Yes. 402 (in service 1947-01-01) shares the same area with 531, so numbers from all of them are local to each other.
Which area codes are nearest to 531?
The area codes closest to 531, measured between the centers of the ZIP code places they serve, are 712 (about 101 miles), 785 (about 135 miles), 515 (about 167 miles), 816 (about 177 miles) and 913 (about 182 miles).
How many prefixes does area code 531 have?
NANPA's report dated 2026-10-17 lists 264 prefixes in service in 531, spread over 104 rate centers and 39 holders.
Are there complaints about 531 numbers?
The FCC data on file has 394 complaints for 340 numbers in 531. 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.