The 319 area code is eastern Iowa — Cedar Rapids, Iowa City, Waterloo, Cedar Falls, Burlington and Keokuk — one of the state’s three original 1947 codes. It carries no overlay: every local number begins with 319, dialed as ten digits since October 2021, while the Mississippi corridor from Dubuque down through Davenport has answered as 563 since 2001.
Cedar Rapids manufacturer, Iowa City clinic, Waterloo shop — eastern Iowa at work is the usual story behind a 319 you weren’t expecting. The code is a record of issuance, not of possession.
319 by the numbers
| Entry | 319 |
|---|---|
| First day in service | January 1, 1947 — one of Iowa’s three original codes (NANPA NPA database) |
| Splits and offspring | 1947 original; parent of 563, which took the Mississippi corridor on March 25, 2001 under Planning Letter PL-253 |
| Second code on the map | None — no overlay has ever been layered on 319 |
| Principal cities | Cedar Rapids · Iowa City · Waterloo · Cedar Falls · Burlington |
| What a local call takes | Ten digits, 1 plus ten on toll — mandatory since October 24, 2021 |
| Numbers last until | First quarter of 2048 (NANPA 2026-1 NPA Exhaust Analysis, April 2026) |
The eastern third of a three-code state
The Cedar and Iowa river valleys, the state’s full Mississippi frontage from the Minnesota line to the Missouri line, and the hill country of the northeast corner: that was 319 on January 1, 1947, the day the original numbering plan went live. Iowa drew three of the plan’s 86 codes — 712 for the west, 515 for the central band around Des Moines, 319 for everything east — and NANPA’s NPA database still carries all three with that same in-service date.
That footprint held for fifty-four years without a split, an overlay or a boundary change. By the late 1990s, though, the prefix arithmetic that governs every area code was closing in: each rate center from Keokuk to Cresco drew its NXX codes from one shared pool of fewer than 800, and a new generation of competitive carriers, pagers and cell sites was consuming them faster than a 1947 map could bear.
Why did Dubuque and Davenport leave the 319 area code?
Because the Iowa Utilities Board chose a geographic split rather than an overlay. NANPA’s Planning Letter PL-253, dated January 2, 2001, records the Board’s November 16, 2000 approval, in Docket SPU 99-30, of a plan introducing a new code — 563 — for the eastern portions of Iowa abutting Wisconsin, Illinois and southeastern Minnesota. A further Board order on December 28, 2000 revised the permissive and mandatory dialing dates and made minor boundary realignments. NANPA’s database dates the assignment of 563 to November 20, 2000.
The changeover ran on the letter’s clock. The split took effect, and permissive dialing opened, at 12:01 a.m. Central Time on March 25, 2001 — the in-service date NANPA’s database records for 563 — and permissive dialing closed at 12:01 a.m. Central Time on December 2, 2001. In between, a call into the new territory completed whether it was dialed with 319 or 563; afterward, the wrong code went to intercept. Carriers were told to have 563 activated across their networks before March 25.
Routing could be checked against two test numbers that could only belong to this project: (563) 324-0563 for LATA 634 and (563) 387-0563 for LATA 635, each answered by a recorded announcement confirming the call had reached the new code. They stayed in service from February 12, 2001 until January 2, 2002.
The line on the map
The rate-center map bound into PL-253 — labeled Alternative #12, revised December 28, 2000 — starts its split line at the western edge of the old territory near Fredericksburg and runs it south between Frederika and Sumner, Hazleton and Arlington, Winthrop and Lamont, Independence and Manchester. East of Cedar Rapids it threads between Anamosa and Cascade, Lisbon and Mechanicsville, West Branch and Tipton, and reaches the Mississippi between Muscatine and Letts.
North and east of that line, the letter’s prefix tables move Davenport, Dubuque, Clinton, Muscatine, Maquoketa, Bellevue, Manchester, Decorah, Waukon, Cresco and West Union to 563. West and south of it, 319 kept Cedar Rapids, Iowa City, Waterloo, Cedar Falls, Waverly, Independence, Oelwein, Anamosa, Vinton, Marengo, Williamsburg, Washington and Mount Pleasant — and the lower river too. Burlington, Fort Madison and Keokuk stayed with the old code, so 319 still touches the Mississippi south of where 563 leaves off.
One caveat the letter itself makes: its prefix tables were current to December 29, 2000, and it points readers to the LERG for anything later. The boundary has not moved since, but which prefixes live inside it has.
The Hudson prefix that forced ten digits
PL-253 set the post-split dialing plan in four lines: seven digits for local calls inside the home code, ten for local calls into the other code, 1 plus ten on toll calls, 0 plus ten for operator-assisted calls. Eastern Iowa kept dialing that way for two more decades.
What ended it was a single entry on the letter’s own tables — the 988 prefix, assigned in the Hudson rate center just south of Waterloo and staying in 319. When the FCC’s order adopted July 16, 2020 (FCC 20-100) made 988 the three-digit route to the national suicide-and-crisis lifeline, every code that combined seven-digit local dialing with a working 988 prefix had to convert, or a Hudson phone number and the hotline would collide. NANPA’s Planning Letter PL-556 (January 8, 2021, superseding PL-544) listed 82 such codes. Under Iowa the letter lists two, 319 and 515, and no others.
The calendar was national: permissive ten-digit dialing from April 24, 2021, mandatory dialing from October 24, 2021, carrier enforcement cutovers complete by July 15, 2022, and 988 live on July 16, 2022. NANPA’s database now records 319’s plan as ten digits on every local call and 1 plus ten on toll, with 1 plus ten accepted on local calls at each provider’s discretion.
Iowa’s other three codes never made the list. NANPA’s database shows 563, 641 and 712 all still completing home-code local calls on seven digits — so a Davenport pizza order takes seven digits, and the same call placed an hour west in Iowa City takes ten.
Six studies, one direction
The first quarter of 2048 is the current reading for 319, from NANPA’s 2026-1 NPA Exhaust Analysis (April 2026, numbering data as of March 1, 2026). The report’s history columns show a forecast that has moved in one direction only: fourth quarter of 2035 in the October 2023 study, third quarter of 2037 by April 2024, second quarter of 2038 that October, second quarter of 2041 by April 2025, second quarter of 2044 by October 2025, and now 2048 — a fifteen-quarter jump in the latest edition, which NANPA attributes to reduced historical and projected demand.
Iowa does not appear on the July 6, 2026 revision sheet, whose four lines are all Texas codes. Inside the state, 319 now sits near the back of the queue: the April 2026 figures put 641 first at the first quarter of 2037, then 712 in the second quarter of 2039, 515 in the second quarter of 2042, 319 in 2048, and 563 — the child code — projected all the way out to the fourth quarter of 2076.
None of the five appears in NANPA’s relief-planning status report dated August 30, 2026, which tracks a dozen open relief projects, and none is on its 36-month exhausting list. NANPA’s database flags 319 as neither in jeopardy nor in relief planning. Relief, whenever it is finally needed, would come as an overlay rather than another split — a second code over the same map, with nobody renumbered — for the reasons our guide to how area codes work explains.
Eastern Iowa picks up for 319
For a business calling into Cedar Rapids’ industrial base, the University of Iowa campus and hospitals in Iowa City, or the Waterloo–Cedar Falls corridor, the caller ID is the first thing screened. A 319 reads as a neighbor; a 563 reads as the river towns; an out-of-state code reads as a stranger. That recognition gap is what local presence dialing is built to close, and it runs unusually clean here because no overlay muddies what the three digits mean.
What the digits cannot do is vouch for the caller. Caller-ID spoofing can stamp 319 onto traffic from anywhere, so the signal worth trusting is not the display but the STIR/SHAKEN attestation the originating carrier signs into the call itself.
SIPNEX signs at the top of that scale. Operating as an FCC-licensed carrier rather than a reseller, it provisions local DID numbers by named rate center — Cedar Rapids, Iowa City, Waterloo and the rest of the 319 map where inventory allows — delivers them over SIP trunking to the PBX or dialer already answering, applies A-level attestation under its own STIR/SHAKEN certificate, and carries toll-free service on its own RespOrg registration.
Reader questions on the 319 area code
Which Iowa cities are in the 319 area code today?
Cedar Rapids, Iowa City, Waterloo, Cedar Falls, Burlington, Fort Madison, Keokuk and Mount Pleasant lead the list. Around them the code covers Waverly, Independence, Oelwein, Anamosa, Vinton, Marengo, Williamsburg and Washington — eastern Iowa’s interior plus the lower Mississippi from Burlington to Keokuk. Davenport, Clinton and Dubuque on the river, and the northeast corner around Decorah, have dialed 563 since the 2001 split; Des Moines and Ames are 515.
Is Dubuque still in the 319 area code?
No — Dubuque has been 563 since the split took effect on March 25, 2001. NANPA’s Planning Letter PL-253 lists every Dubuque prefix among the codes moving to 563, alongside Davenport, Clinton, Muscatine, Maquoketa, Decorah and Waukon. The Iowa Utilities Board approved the geographic split on November 16, 2000 in Docket SPU 99-30; permissive dialing ran until December 2, 2001, after which a call dialed with the old code went to intercept.
Do 319 area code calls need all ten digits?
Yes — every local call inside 319 has required ten digits since October 24, 2021. The change came from NANPA’s Planning Letter PL-556 (January 8, 2021), which converted the 82 seven-digit codes carrying a live 988 prefix ahead of the crisis line; Iowa’s two entries were 319 and 515. Toll calls take 1 plus ten, providers may accept 1 plus ten on local calls, and Iowa’s other codes — 563, 641 and 712 — still complete home-code local calls on seven digits.
When will the 319 area code run out of numbers?
Not before 2048, on NANPA’s current forecast. The 2026-1 NPA Exhaust Analysis (April 2026) projects exhaust in the first quarter of 2048, fifteen quarters later than the October 2025 study, on reduced demand. Every study since October 2023 has pushed the date further out, the July 6, 2026 revisions touched only four Texas entries, and NANPA’s August 30, 2026 relief-planning status report carries no Iowa code. New numbers remain available by rate-center prefix, subject to inventory.
Does a 319 number have to be answered in Iowa?
No. A local number follows its rate-center assignment rather than a street address, so 319 digits can ring a desk in any state over SIP. SIPNEX issues local DID numbers one exchange at a time — Cedar Rapids, Iowa City, Waterloo and the rest of the code where inventory permits — routes them into the phone system already in place, and signs outbound calls at A-level attestation under its own STIR/SHAKEN certificate.
A 1947 original that gave up its river corridor in 2001 and has needed nothing since: eastern Iowa still answers to one set of three digits. Holding some of them takes a rate-center order with SIPNEX — a directly licensed FCC carrier — and dialer-grade SIP trunking to deliver them, nothing more; every outbound call leaves signed at A-level attestation on SIPNEX’s own STIR/SHAKEN certificate. Rates are posted at SIPNEX pricing, the contact desk takes questions in writing, and (833) 665-2220 takes them by voice.
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