--- title: "Area code 319: Iowa, United States" url: "https://lookvalid.com/area-code/319.md" canonical_url: "https://lookvalid.com/area-code/319" last_updated: "2026-10-23" type: "reference" summary: "Area code 319 serves Iowa, United States. Number formats, numbering rules, a live phone validator and the other codes in Iowa." --- # Area code 319: Iowa, United States Area code 319 serves Iowa, United States. Number formats, numbering rules, a live phone validator and the other codes in Iowa. NANPA lists 565 central office codes (prefixes) in use in area code 319, held by 85 holders across 137 rate centers. Qwest holds the most prefixes, 99 (18%). 69% of the prefixes are pooled, which means their thousands-blocks can belong to different companies. The FCC unwanted-call data has 3,772 complaints on file for 2,827 numbers in 319, most often filed as "Unwanted Calls". These are consumer reports, not findings. ## Facts - 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 | 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% | ## Carriers | 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. ## History - 1947-01-01: Area code 319 went into service. - 2001-03-25: Area code 563 went into service and names 319 as its parent. ## Nearest area codes 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). ## ZIP codes 121 ZIP codes fall in places that have a rate center in this area code. The places with the most are Iowa City, IA (6 ZIP codes), Waterloo, IA (4 ZIP codes) and Amana, IA (2 ZIP codes). 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 3,772 complaints for 2,827 numbers. Numbers whose latest complaint falls in each year: - 2023: 92 - 2024: 62 - 2025: 92 ## Questions ### 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. 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).