Mercer County, Ohio ZIP codes
10 ZIP codes are in Mercer County, plus 8 that cross in from neighboring counties. It's part of the Celina, OH micro area.
- ZIP codes
- 10
- Population in these ZIPs
- 42,549
- Avg. median income
- $79,300population-weighted
- Cities & towns
- 10
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Mercer County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 45310 | Burkettsville | 227 | $77,917 | $230,100 |
| 45822 | Celina | 19,957 | $70,200 | $245,300 |
| 45826 | Chickasaw | 394 | $101,250 | $296,900 |
| 45828 | Coldwater | 6,404 | $72,703 | $294,400 |
| 45846 | Fort Recovery | 4,644 | $91,736 | $350,500 |
| 45860 | Maria Stein | 2,326 | $111,269 | $436,900 |
| 45862 | Mendon | 1,417 | $45,556 | $179,700 |
| 45866 | Montezuma | 117 | $80,833 | $156,200 |
| 45882 | Rockford | 2,919 | $74,625 | $229,700 |
| 45883 | Saint Henry | 4,144 | $113,967 | $382,300 |
ZIP codes partly in Mercer County
These ZIP codes are mostly in a neighboring county but cover part of Mercer County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 45388 | Yorkshire | Darke County | 841 | $86,996 | $356,300 |
| 45845 | Fort Loramie | Shelby County | 3,429 | $95,078 | $348,400 |
| 45865 | Minster | Auglaize County | 5,522 | $89,000 | $344,500 |
| 45869 | New Bremen | Auglaize County | 4,170 | $88,277 | $313,600 |
| 45885 | Saint Marys | Auglaize County | 12,753 | $78,550 | $209,400 |
| 45887 | Spencerville | Allen County | 4,422 | $68,409 | $202,600 |
| 45894 | Venedocia | Van Wert County | 602 | $81,360 | $213,900 |
| 45898 | Willshire | Van Wert County | 917 | $53,783 | $183,600 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Mercer County
Nearby counties
Frequently asked questions
How many ZIP codes are in Mercer County, Ohio?
10 ZIP codes are mainly in Mercer County, and 8 more ZIP codes from neighboring areas reach partly into it.
What cities are in Mercer County?
ZIP codes in Mercer County use the city names Burkettsville, Celina, Chickasaw, Coldwater, Fort Recovery, Maria Stein, Mendon, Montezuma, Rockford and Saint Henry.
What metro area is Mercer County in?
Mercer County is part of the Celina, OH micropolitan statistical area.