Knox County Airport (4I3), Ohio
Landing essentials
Whether you can land, whether you can refuel, and how customs works here.
Overview
Knox County Airport (4I3) is a public-use general aviation field in Mount Vernon, Ohio, roughly 29 nautical miles from the Columbus metro area. The airport runs a single paved runway and supports business aviation traffic alongside local operations, with fuel available around the clock through a self-service credit card system. As a non-towered field, pilots coordinate via CTAF, and staffed attendance hours are posted separately from fuel availability.
Runways
Knox County Airport has one paved runway, 10/28, 5,504 ft long and 100 ft wide, with an asphalt surface.
Source: FAA Form 5010.
Fuel and airfield services
Knox County Airport has Jet A+ and 100LL available on the field. The airport has no control tower.
Source: FAA Form 5010 / NASR.
Customs
Knox County Airport does not clear customs. The nearest port of entry is John Glenn Columbus International (KCMH), 26 NM away.
Source: CBP list of ports of entry.
Business aviation traffic
Knox County Airport recorded 624 business aviation movements in 2025. Traffic peaks in April and October. Business aviation traffic at 4I3 peaks in April and October, with both months showing roughly double the volume of the slower winter months.
Business jet movements, FAA TFMSC count. Peak month October, 90 movements in 2025.
Source: FAA TFMSC, business jet movements, 2025.
Climate
Knox County Airport averages 2.0 days above 90°F in July and 28.0 freeze days in January. July is the warmest month, with average highs of 81.9°F, and January the coldest, at 33.1°F.
Weather station is 5.3 NM from the field. Some values are estimated by the agency. 1991–2020 climate normals.
Source: NOAA NCEI.
Operating constraints
Knox County Airport has published operating constraints in three categories: runway notes, environmental and other notes.
Activate the REIL for runway 10 and 28, and the MIRL for runway 10/28, via CTAF. The PAPI for runway 10 and runway 28 operates continuously.
Deer, birds, and other wildlife are present on and in the vicinity of the airport.
Fuel is available 24 hours a day, self-service, via credit card.
Source: FAA Chart Supplement.
Nearby airfields
Knox County Airport has five airfields within 30 NM. The closest is Licking County Regional (KVTA), 18.50 NM south.
Part of the Columbus, Ohio area.
Source: Skystar calculation from official coordinates.
Skystar at 4I3
We arrange catering, fuel and trip support here. Supplier prices reach you unchanged; our coordination fee sits on its own line.
The same order, priced two ways.
$2,400.00 catering order at 4I3.
Unchanged.
What the kitchen invoices us is what your quote reads.
One line, fixed.
It does not move with the size of the order.
At cost.
Passed on at the exact amount the processor took.
Market practice figures are industry averages, not a specific competitor.
Frequently asked questions
What runway does KNOX COUNTY (4I3) offer for business aircraft?
Knox County Airport, identifier 4I3, has a single paved runway, designated 10/28, measuring 5,504 feet long and 100 feet wide with an asphalt surface. This is the same length listed as the airport's maximum paved runway distance, confirming it as the only hard-surface option at the field. There is no parallel or crosswind runway. Operators planning approaches into 4I3 should note the field is non-towered, so runway use and traffic pattern entry are coordinated by pilots on CTAF rather than by air traffic control.
Is fuel available at 4I3 outside staffed hours?
Yes, fuel at Knox County Airport is available 24 hours a day through a self-service credit card system, independent of the airport's staffed attendance schedule. The field stocks both 100LL and Jet A fuel types. Staffed hours run Monday through Friday from 0700 to 1700 and weekends from 0900 to 1700, but the self-service fuel arrangement means aircraft can refuel outside those windows without needing personnel on site. This makes 4I3 usable for fuel stops beyond normal business hours.
Where is the nearest customs facility to KNOX COUNTY airport?
Knox County Airport does not have customs service on site. The nearest customs-capable airport is John Glenn Columbus International (KCMH), located about 26 nautical miles away. Operators requiring customs clearance near 4I3 need to route through KCMH rather than clearing directly at Knox County. This distance should be factored into trip planning for any international arrival that would otherwise favor landing directly at Mount Vernon.
What wildlife hazards are reported at 4I3?
Knox County Airport has a standing wildlife advisory covering deer, birds, and other wildlife both on the airport property and in its vicinity. This is a general caution applicable to all operations at the field, not limited to a specific runway or time of day. Pilots operating at 4I3, particularly during approach, landing, and taxi phases, should maintain vigilance for wildlife incursions onto movement areas. No specific mitigation program or schedule is noted beyond the general advisory.
When is business aviation traffic busiest at KNOX COUNTY airport?
Business aviation traffic at Knox County Airport (4I3) is concentrated in April and October, with 89 and 90 operations respectively according to FAA TFMSC data for 2025. These two months stand well above the rest of the year, where monthly totals mostly range between 22 and 66 operations. December is the slowest month at 22 operations, while July is the busiest of the remaining months at 66. Operators scheduling flexible trips to 4I3 may find lower traffic density outside the spring and fall peaks.