Area code
319
319 is a United States area code. Under the North American Numbering Plan it belongs to Iowa, which has 5 area codes in total.
Validate a number in 319
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 319 at a glance
NANPA lists 565 central office codes (prefixes) in use in area code 319, held by 85 holders across 137 rate centers.
| Fact | Value |
|---|---|
| In service since | 1947-01-01 |
| Time zone | Central (C) |
| Prefixes in use | 565 |
| Pooled prefixes | 388 (69%) |
| Rate centers | 137 |
| Companies holding prefixes | 85 |
| Assignment dates on file | 2001-01-19 to 2026-03-19 (241 prefixes) |
| ZIP codes in its places | 121 |
Rate centers in area code 319
| Rate center | Prefixes | Share |
|---|---|---|
| CEDAR RPDS | 110 | 19% |
| IOWA CITY | 50 | 9% |
| WATERLOO | 47 | 8% |
| BURLINGTON | 19 | 3% |
| CEDARFALLS | 13 | 2% |
| FT MADISON | 11 | 2% |
| MTPLEASANT | 10 | 2% |
| WASHINGTON | 10 | 2% |
| 129 other rate centers | 295 | 52% |
Who holds the prefixes in 319
Qwest holds the most prefixes, 99 (18%). 69% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| Holder | Prefixes | Share |
|---|---|---|
| Qwest | 99 | 18% |
| T-Mobile USA | 39 | 7% |
| United States Cellular | 39 | 7% |
| Verizon Wireless | 39 | 7% |
| Windstream Iowa Communications | 37 | 7% |
| MCC Telephony | 33 | 6% |
| 79 other carriers | 279 | 49% |
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 319
- 1947-01-01 Area code 319 went into service.
- 2001-03-25 Area code 563 went into service and names 319 as its parent.
Area codes nearest to 319
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 319
121 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| Iowa City, IA | 6 |
| Waterloo, IA | 4 |
| Amana, IA | 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 319 numbers
3,772 FCC complaints are on file for 2,827 numbers in 319, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 92 |
| 2024 | 62 |
| 2025 | 92 |
Other area codes in Iowa
Iowa is one state with 5 area codes in the NANPA table. 319 is one of them.
Next to 319 in the numbering table
These are the codes just before and after 319 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 319 was first assigned in Iowa. 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 Iowa next to a 319 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 319
Where is area code 319?
NANPA assigns area code 319 to Iowa, United States.
In which state does area code 319 sit?
Iowa. 319 is one of 5 area codes the NANPA table assigns to the state.
Which places does area code 319 cover?
The places with the most ZIP codes among the rate centers in 319 are Iowa City, IA, Waterloo, IA and Amana, IA. The rate center list on this page shows all of them.
Who owns area code 319?
NANPA assigns area codes. Within 319, Qwest holds the most prefixes, 99 prefixes or 18%.
Which time zone does 319 use?
The NANPA NPA report lists the time zone for 319 as Central (C).
What year did 319 enter service?
The NANPA NPA report gives an in-service date of 1947-01-01, so 319 has been in use since 1947.
Does area code 319 have an overlay?
The NANPA NPA report lists no other area code in an overlay with 319.
Which area codes are nearest to 319?
The area codes closest to 319, measured between the centers of the ZIP code places they serve, are 563 (about 56 miles), 641 (about 73 miles), 515 (about 104 miles), 309 (about 120 miles) and 608 (about 137 miles).
How many prefixes does area code 319 have?
NANPA's report dated 2026-10-17 lists 565 prefixes in service in 319, spread over 137 rate centers and 85 holders.
Are there complaints about 319 numbers?
The FCC data on file has 3,772 complaints for 2,827 numbers in 319. 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.