2
Runways
5
Frequencies
0
Procedures
8
NOTAMs
Quick Facts
ICAO
KMRT
FAA
MRT
Elevation
1,020.7 ft MSL
Runways
2
Frequencies
5
Tower
No
Fuel
100LL,A1,A1+
Coordinates
40.224, -83.352
Airport Information
Facility Type
AIRPORT
Elevation
1,020.7 ft MSL
Control Tower
No
Fuel Types
100LL,A1,A1+
ARTCC
INDIANAPOLIS
Coordinates
40.2245, -83.3517
Ownership
Public
Hours of Operation
Current Weather
METAR KMRT 272035Z AUTO VRB03KT 6SM -RA BR FEW007 24/23 A2995 RMK AO2 LTG DSNT N
Flight Category
VFR
Wind
VRB° at 3 kt
Visibility
6 SM
Temperature
24°C
Dewpoint
23°C
Altimeter
1014.30 inHg
Weather
-RA BR
Cloud Cover
FEW
Observed 2026-06-27 20:35Z
Runways
| ID | Length | Width | Surface | Lights |
|---|---|---|---|---|
| 08/26 | 2,522 ft | 80 ft | TURF | - |
| 09/27 | 4,218 ft | 75 ft | ASPH | MED |
Frequencies
| Type | Frequency | Name |
|---|---|---|
| APCH/P DEP/P IC | 125.95 | JOHN GLENN COLUMBUS INTL |
| APCH/P DEP/P IC | 317.775 | JOHN GLENN COLUMBUS INTL |
| CTAF | 123.05 | UNION COUNTY |
| MRT AWOS-3PT | XXX.XXX | - |
| UNICOM | XXX.XXX | UNION COUNTY |
Active NOTAMs
Nearby Airports in Ohio
0D7
ADA
ADA — 949 ft
K0D7
Ada Airport
Ada — 949 ft
83OH
Adams Strip
Pleasant Hill — 973 ft
83OH
ADAMS STRIP
PLEASANT HILL — 973 ft
50OH
Aerodrome Les Noyers
Jamestown — 1,085 ft
50OH
AERODROME LES NOYERS
JAMESTOWN — 1,085 ft
55OI
AERO FLIGHT CENTER
EAST PALESTINE — 1,140 ft
55OI
Aero Flight Center Airport
East Palestine — 1,140 ft
Nearest airports
- 0D7 — ADA
ADA
- K0D7 — Ada Airport
Ada
- 83OH — Adams Strip
Pleasant Hill
- 83OH — ADAMS STRIP
PLEASANT HILL
- 50OH — Aerodrome Les Noyers
Jamestown
Ohio airports
KMRT Operational Overview
Location & Facility
UNION COUNTY (KMRT) is a publicly owned airport open to the public located in MARYSVILLE, Ohio, United States. The field sits at an elevation of 1,020.7 feet above mean sea level (MSL) at coordinates 40.2245°N, 83.3517°W.
Runways
UNION COUNTY has 2 runways. The longest runway (08/26) measures 2,522 feet by 80 feet with a turf surface. Other runways include 09/27 (4,218 ft, ASPH).
Communications & Operations
UNION COUNTY is a non-towered (pilot-controlled) field. A total of 5 communication frequencies are published for this facility.
Services & Fuel
UNION COUNTY offers 100LL,A1,A1+ fuel. Pilots planning fuel stops should confirm availability with the FBO, as hours and pricing may vary.
Current Conditions
The current flight category at UNION COUNTY is VFR (Visual Flight Rules — good flying conditions). Weather conditions are updated in real-time from official NOAA Aviation Weather Center observations. There are currently 8 active NOTAMs for this facility.
Frequently Asked Questions
What is KMRT?
KMRT is the ICAO identifier for UNION COUNTY, a public-use airport located in MARYSVILLE, Ohio, United States.
How many runways does UNION COUNTY have?
UNION COUNTY (KMRT) has 2 runways. See the runway table above for dimensions and surface types.
What is the elevation of KMRT?
The field elevation of UNION COUNTY is 1,020.7 feet above mean sea level (MSL).
Is fuel available at KMRT?
Yes, UNION COUNTY offers 100LL,A1,A1+ fuel.
What are the current weather conditions at KMRT?
The current flight category at UNION COUNTY is VFR. See the METAR section above for full decoded weather data including wind, visibility, temperature, and altimeter.
Are there active NOTAMs at KMRT?
There are currently 8 active NOTAMs for UNION COUNTY. Sign up for AeroCopilot to read decoded NOTAM text and AI interpretations.
How do I access complete data for KMRT?
Sign up for a free AeroCopilot account to access all frequencies, full NOTAM text with AI interpretation, decoded forecasts, and IFR procedure charts for UNION COUNTY.
Where is UNION COUNTY located?
UNION COUNTY (KMRT) is located in MARYSVILLE, Ohio, United States, at an elevation of 1,020.7 ft MSL.