Mount Vernon, Ohio
4I3 Knox County
Knox County (4I3) is a non-towered, public-use airport in Mount Vernon, Ohio, at 1,191.6 ft MSL. Its runway is 10/28 (5,504 by 100 ft, asphalt). Published pattern altitude 808 ft AGL (about 2,000 ft MSL). CTAF 123.05.
FAA NASR data effective Oct 29, 2026. Not for navigation; verify with current FAA charts and the Chart Supplement.
Airport
At a glance
- Identifiers
- FAA 4I3
- Location
- Mount Vernon, Ohio (Knox County). 4 NM SW of the city center
- Elevation
- 1,191.6 ft MSL
- Position
- 40.3289° N, 82.5261° W
- Pattern altitude
- 808 ft AGL
- Control tower
- No, non-towered
- Sectional chart
- Detroit
- Magnetic variation
- 6° W (1990)
- Fuel
- 100LL, Jet A+
- Ownership
- Publicly owned, open to the public
- Attendance
- MON-FRI 0700-1700; SAT-SUN 0900-1700
1 runway
Runways
| Runway | Length × width | Surface | Edge lights |
|---|---|---|---|
| 10/28 | 5,504 × 100 ft | Asphalt, good condition | Medium intensity |
Runway ends and traffic pattern
| End | Pattern | Glide slope lights | Instrument | Displaced threshold | Landing distance |
|---|---|---|---|---|---|
| 10 | Left traffic | 4-light PAPI, left | None listed | None listed | Not listed |
| 28 | Left traffic | 4-light PAPI, left | None listed | None listed | Not listed |
VHF
Frequencies
- CTAF
- 123.05
- Actvt Reil Rwy 10 & 28; Mirl Rwy 10/28 - Ctaf. Papi Rwy 10 & 28 Opr Consly.
- UNICOM
- 123.05
- Clearance delivery
- 119.45
- Approach / departure
- 125.95
- "Columbus"
Weather station
- AWOS-3PT 4I3
- 126.05
Before you go
Brief 4I3 in Ascent EFB.
Current weather, NOTAMs and the airport diagram for Knox County, in the app on iPhone and iPad.
Not for navigation. Verify with current FAA charts and the Chart Supplement before flight.
Source: FAA NASR 28-day subscription, cycle effective Oct 29, 2026. Airport data changes every 28 days and NOTAMs can override it at any time.