Fairfield, OH ZIP Codes
Fairfield, Ohio has 2 ZIP codes: for street addresses and for PO boxes.
Mail addressed to Fairfield covers nearby places too.
Where the 45014 ZIP code reaches
Tap or point to an area to see its ZIP code.Full-size map
45018 has no area on the map: it is a PO box or single-organization ZIP code. Dashed line: Fairfield city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
Check an address in Fairfield
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?
Fairfield PO box and business ZIP codes
| ZIP | Type and post office or station |
|---|---|
| 45014 | street delivery Fairfield |
| 45018 | PO boxes at the Fairfield post office Fairfield |
ZIP codes from nearby towns that reach into Fairfield
- 45011, mailing town Hamilton, covers 7 percent of Fairfield
Why your mail may say Fairfield when you live outside it
Fairfield ZIP codes also cover Ross, so a letter addressed to Fairfield can go to a home outside the city limits.
The reverse happens too: parts of Fairfield use 45011, which mails under a neighboring town's name.
A ZIP code does not set your city, school district or tax. Butler County property records show which city you are in.
Fairfield ZIP code questions
What is the main ZIP code for Fairfield?
45014, the ZIP code of the main Fairfield post office at 700 Wessel Dr.
Which Fairfield ZIP codes are for PO boxes only?
45018. Mail to it goes to boxes at the post office, not to street addresses.
What county is Fairfield in?
Butler County.
ZIP codes for towns near Fairfield
More towns near Fairfield: Kettering, Dayton, Beavercreek, Richmond, Huber Heights, Fairborn, Springfield, Georgetown, Columbus.
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