Knox County, OH ZIP codes
There are 9 ZIP codes in Knox County, OH, in 9 towns, from 43005 to 43050. The largest are 43050 (Mount Vernon), 43019 (Fredericktown) and 43011 (Centerburg). 1 more crosses into it from a neighbouring county: 43080.
The county seat is Mount Vernon.
- ZIP codes
- 9
- Partly in it
- 1 more
- Towns
- 9
- County seat
- Mount Vernon
- County FIPS
39083- State
- Ohio
- Population
- 63,142
- Median household income
- $73,878
- Land area
- 525 sq mi
- Area code
- 740
- Metro area
- Mount Vernon
Knox County ZIP codes by town
- Mount Vernon (county seat)
- 43050
Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.
ZIP codes partly in Knox County
This ZIP code lies mostly in a neighbouring county but covers a twentieth or more of Knox County.
- 43080 Utica · mostly in Licking County
Map of Knox County ZIP codes
The ZIP codes of Knox County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.
Knox County in numbers
About 63,142 people live in Knox County, in 23,491 households, the 40th most populous of Ohio's 88 counties. The median household income is $73,878 a year, 3% above the Ohio median of $71,389 (US: $80,734). The median owner-occupied home is valued at $239,400 (11% above the Ohio median), and median gross rent is $950 a month. The median age is 39.4; 24.7% of adults 25 and over hold a bachelor's degree or higher (31.5% across Ohio); the average commute takes 26 minutes.
| Population | 63,142 |
|---|---|
| Households | 23,491 |
| Median age | 39.4 |
| Median household income | $73,878 |
| Median home value | $239,400 |
| Median gross rent | $950 |
| Bachelor's degree or higher | 24.7% |
| Mean commute | 25.7 min |
| Population density | 120 / sq mi |
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.
Largest towns in Knox County
| Town | ZIP codes | Population |
|---|---|---|
| Mount Vernon | 1 | 17,052 |
| Fredericktown | 1 | 2,652 |
| Gambier | 1 | 2,126 |
| Centerburg | 1 | 1,839 |
| Danville | 1 | 615 |
| Martinsburg | 1 | 303 |
| Bladensburg | 1 | 300 |
| Howard | 1 | 269 |
Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.
Neighbouring counties
Counties that share a ZIP code with Knox County.
- Delaware County (10)
- Licking County (20)
- Richland County (13)
- Muskingum County (18)
- Ashland County (10)
- Holmes County (16)
- Coshocton County (11)
- Morrow County (11)
Not sure you are in Knox County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Knox County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
43005 | Bladensburg , OH | Standard | 339 | $72,910 | $97,400 |
43011 | Centerburg , OH | Standard | 6,594 | $90,121 | $315,600 |
43014 | Danville , OH | Standard | 3,738 | $66,481 | $220,900 |
43019 | Fredericktown , OH | Standard | 9,445 | $68,104 | $206,800 |
43022 | Gambier , OH | Standard | 3,635 | $94,712 | $315,900 |
43028 | Howard , OH | Standard | 7,799 | $91,186 | $273,000 |
43037 | Martinsburg , OH | Standard | 293 | $69,625 | $273,400 |
43048 | Mount Liberty , OH | No street area | — | — | — |
43050 | Mount Vernon , OH | Standard | 31,074 | $64,108 | $220,300 |
Cite this page
zipcodes.pro. “Knox County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/oh/county/knox
Underlying data is public domain or openly licensed — sources, vintages and licences.