Knox County, Ohio ZIP codes
9 ZIP codes are in Knox County, plus 8 that cross in from neighboring counties. It's part of the Mount Vernon, OH micro area.
- ZIP codes
- 9
- Population in these ZIPs
- 62,917
- Avg. median income
- $72,800population-weighted
- Cities & towns
- 9
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Knox County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 43005 | Bladensburg | 339 | $72,910 | $97,400 |
| 43011 | Centerburg | 6,594 | $90,121 | $398,900 |
| 43014 | Danville | 3,738 | $66,481 | $284,700 |
| 43019 | Fredericktown | 9,445 | $68,104 | $290,500 |
| 43022 | Gambier | 3,635 | $94,712 | $379,600 |
| 43028 | Howard | 7,799 | $91,186 | $325,800 |
| 43037 | Martinsburg | 293 | $69,625 | $196,000 |
| 43048 PO Box | Mount Liberty | — | — | — |
| 43050 | Mount Vernon | 31,074 | $64,108 | $248,700 |
ZIP codes partly in Knox County
These ZIP codes are mostly in a neighboring county but cover part of Knox County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 43006 | Brinkhaven | Coshocton County | 701 | $63,152 | $279,400 |
| 43080 | Utica | Licking County | 5,321 | $87,301 | $294,700 |
| 43822 | Frazeysburg | Muskingum County | 5,095 | $60,266 | $259,200 |
| 43843 | Walhonding | Coshocton County | 618 | $61,378 | $287,300 |
| 44628 | Glenmont | Holmes County | 1,270 | $61,518 | $273,000 |
| 44813 | Bellville | Richland County | 8,994 | $77,846 | $286,700 |
| 44822 | Butler | Richland County | 3,995 | $72,159 | $262,900 |
| 44842 | Loudonville | Ashland County | 5,326 | $72,737 | $237,400 |
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 Knox County
Nearby counties
Frequently asked questions
How many ZIP codes are in Knox County, Ohio?
9 ZIP codes are mainly in Knox County, and 8 more ZIP codes from neighboring areas reach partly into it.
What cities are in Knox County?
ZIP codes in Knox County use the city names Bladensburg, Centerburg, Danville, Fredericktown, Gambier, Howard, Martinsburg, Mount Liberty and Mount Vernon.
What metro area is Knox County in?
Knox County is part of the Mount Vernon, OH micropolitan statistical area.