North American Numbers Source-cited · ownership disclosed
Area code
326
In service
United States · since 2020

Dayton/Springfield (overlay)

All-service overlay of area code 937 covering the Dayton and Springfield region of southwestern-central Ohio. Activated in 2020.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Dayton/Springfield (overlay)
Type
geographic
Status
in service
In service since
2020
Projected exhaust
2083 Q4

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 326 is

Southwestern-central Ohio, coextensive with area code 937 (Dayton/Springfield).

Communities served wholly or partly by 326:

DaytonSpringfieldKetteringHuber HeightsFairborn

Serves the full 937 footprint; representative list.

B · Relationships

How it relates to other codes

The codes 326 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Overlay · 2020 937 Dayton/Springfield All-service overlay sharing the 937 numbering plan area. "326" maps to "DAO" (Dayton, Ohio).
What's changing. Overlay of 937 since March 2020; ten-digit dialing required.
C · History

How 326 got here

2018-07-03
Planned as an overlay of 937 after projections showed 937 exhaust by Q3 2020.
Source: Wikipedia: Area codes 937 and 326
2019-08-10
Ten-digit permissive dialing period began.
Source: Wikipedia: Area codes 937 and 326
2020-03
Activated as an overlay complex (seven-digit dialing ended Feb 8, 2020).
Source: Wikipedia: Area codes 937 and 326
D · Capacity

How full it is

Prefixes assigned
102
Prefixes available
698
Thousands-blocks assigned
589

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 326 with another code →
Sources
Wikipedia ↗
Area codes 937 and 326
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.