The 319 area code covers Cedar Rapids, Iowa City and 130 more places in Iowa.
Area code 319 is in Iowa, on Central Time. In the 319 area, phone numbers are given out most in Linn County, then Johnson and Black Hawk counties. It has been in service since 1947.
- Where
- 8 counties in Iowa, mostly Linn County, Johnson County and Black Hawk County
- Time zone
- Central Time
- In service since
- 1947, one of the original area codes
- Shares its area with
- No other area code
- Prefixes in use
- 565
- How to dial
- Local calls need all 10 digits: 319-555-0142.
Find out who called you from a 319 number.
Enter the full 10-digit number to see who it is listed to and the city and state on the listing. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup. To see whether it is a mobile, a landline or a VoIP line, use our free VoIP checker. To see which carrier a (319) number is on today, use our free carrier lookup.
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Cedar Rapids holds 19% of the phone prefixes in area code 319.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 565 prefixes in use shows where 319 numbers are actually given out.
- Cedar Rapids110 prefixes, 19%
- Iowa City50 prefixes, 9%
- Waterloo47 prefixes, 8%
- Burlington19 prefixes, 3%
- Cedar Falls13 prefixes, 2%
- Fort Madison11 prefixes, 2%
- Mount Pleasant10 prefixes, 2%
- Washington10 prefixes, 2%
Also served: Anamosa, Keokuk, Oelwein and Vinton and 120 smaller places.
Qwest (Lumen) holds the most phone number prefixes in area code 319: 99 of 565.
NANPA, which runs the North American numbering plan, assigns each prefix (the three digits after the area code) to one carrier. Here is how the 565 prefixes in use in 319 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| Qwest (Lumen)Lumen's landline company | 99 | 18% |
| WindstreamLandline company | 65 | 12% |
| T-MobileMobile network | 39 | 7% |
| UScellularMobile network | 39 | 7% |
| MediacomCable company's phone service | 34 | 6% |
| Ton80 Communications | 17 | 3% |
| 70 other carriers | 272 | 48% |
69% of these prefixes are pooled, which means the blocks of 1,000 numbers inside them can belong to other carriers. Any number can also have been moved to another carrier since, so this shows who holds the prefixes, not who serves a given number.
Want the carrier of one exact number? Our free carrier lookup checks it, because numbers move between carriers.
Source: NANPA central office code assignments, October 1, 2026.
319 has been split once since 1947.
1947
319 is one of the original North American area codes.
2001
On March 25, 2001, 563 splits off and takes part of the 319 area.
A 319 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
The area codes closest to 319 are 563, 641 and 608.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
Iowa has 4 other area codes.
These are the questions people ask most about area code 319.
Where is area code 319?
319 covers Cedar Rapids, Iowa City, Waterloo and Burlington and 128 more places in Iowa. In the 319 area, phone numbers are given out most in Linn County, then Johnson and Black Hawk counties.
What state is area code 319 in?
Iowa. 319 is an Iowa area code on Central Time.
What cities use area code 319?
The places holding the most 319 prefixes are Cedar Rapids, Iowa City, Waterloo, Burlington, Cedar Falls, Fort Madison, Mount Pleasant and Washington, out of 132 places in all. The count comes from NANPA's prefix assignments as of October 1, 2026.
Which phone company owns area code 319?
No single phone company owns 319. NANPA's records show Qwest (Lumen) holds the most 319 prefixes, 99 of 565, followed by Windstream and T-Mobile. Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 319 in?
319 is on Central Time.
When did area code 319 start?
319 is one of the original North American area codes, in service since 1947.
How do I dial a 319 number?
Local calls need all 10 digits: 319-555-0142.
Is 319 a toll-free number?
No. 319 is a regular area code for Cedar Rapids and Iowa City in Iowa, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
What area codes are near 319?
The closest are 563 (Davenport, Iowa), 641 (Mason City, Iowa), 608/353 (Madison, Wisconsin) and 515 (Des Moines, Iowa), measured between the centres of each area.
Who called me from a 319 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 319 a scam?
319 is a real Iowa area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Put this lookup on your site: our free area code widget takes two lines of code and shows any US area code's state, time zone and local time.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.