Mercer County, Missouri ZIP codes
3 ZIP codes are in Mercer County, plus 4 that cross in from neighboring counties.
- ZIP codes
- 3
- Population in these ZIPs
- 3,625
- Avg. median income
- $58,700population-weighted
- Cities & towns
- 3
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ZIP codes in Mercer County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 64632 | Cainsville | 371 | $50,313 | $157,600 |
| 64661 | Mercer | 757 | $54,122 | $73,800 |
| 64673 | Princeton | 2,497 | $61,364 | $113,500 |
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 |
|---|---|---|---|---|---|
| 64645 | Harris | Sullivan County | 195 | $53,125 | — |
| 64667 | Newtown | Sullivan County | 255 | $47,841 | $90,000 |
| 64672 | Powersville | Putnam County | 185 | $43,250 | — |
| 64679 | Spickard | Grundy County | 921 | $53,611 | $205,600 |
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, Missouri?
3 ZIP codes are mainly in Mercer County, and 4 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 Cainsville, Mercer and Princeton.