Mason, OH ZIP Code
Mason, Ohio has one ZIP code: .
Mail addressed to Mason covers nearby places too.
Where the 45040 ZIP code reaches
Tap or point to an area to see its ZIP code.Full-size map
Dashed line: Mason city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
Check an address in Mason
Street ranges from the Census Bureau, 2026. PO box and organization ZIP codes are not found by street. A new street may be missing: address not found?
ZIP codes from nearby towns that reach into Mason
- 45036, mailing town Lebanon, covers 7 percent of Mason
Why your mail may say Mason when you live outside it
Mason ZIP codes also cover Deerfield Township and Kings Mills, so a letter addressed to Mason can go to a home outside the city limits.
The reverse happens too: parts of Mason use 45036, which mails under a neighboring town's name.
A ZIP code does not set your city, school district or tax. Warren County property records show which city you are in.
Mason ZIP code questions
What is the main ZIP code for Mason?
45040, the ZIP code of the main Mason post office at 6338 Snider Rd.
What county is Mason in?
Warren County.
ZIP codes for towns near Mason
More towns near Mason: Beavercreek, Dayton, Florence, Fairborn, Huber Heights, Richmond, Springfield, Grove City, Hilliard.
Sources and last checked
USPS ZIP Locale Detail (October 1, 2026), GeoNames (CC BY 4.0), U.S. Census Bureau, HUD-USPS crosswalk.
Checked October 20, 2026. Sources · How we build our lists · Corrections