Airport information
- FAA LID
- 4MD9
- Coordinates
- 39.4806, -76.7606
- Elevation
- 461 ft MSL
- Magnetic variation
- 10W
- Sectional chart
- WASHINGTON
- Airport use
- Private
- Control tower
- No
- ARTCC
- WASHINGTON (ZDC)
- Flight service (FSS)
- LEESBURG
- Attendance
- UNATNDD
- Segmented circle
- No
- Activated
- 1992/12
- Distance from city
- 4 N
Weather
METAR observed
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TAF forecast
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Sun & FAA night 2026-06-21
| Event | Local (EDT) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 05:07 AM | 09:07Z |
| Sunrise | 05:40 AM | 09:40Z |
| Sunset | 08:38 PM | 00:38Z |
| Evening civil twilight Loggable night begins | 09:10 PM | 01:10Z |
Plan a flight from 4MD9
Traffic pattern
- Landing
- Rwy 02
- Pattern
- left (turns left)
- TPA
- 1,500 ft MSL (≈1,000 AGL)
Enter the left downwind for Rwy 02 at 1,500 ft MSL (≈1,000 AGL) on a 45°. TPA estimated at 1,000 ft AGL (not charted for this field).
Runway 02/20
2,600 ft × 120 ft · Turf- Heading
- n/a
- Traffic pattern
- Left
- Approach obstacle
- Pline, 30 ft, 300 ft from threshold
- Displaced threshold
- 300 ft
- Heading
- n/a
- Traffic pattern
- Left
- Approach obstacle
- Trees, 18 ft, 0 ft from threshold
| Runway | Length | Your margin |
|---|---|---|
| 02/20 | 2,600 ft |
Nearby navigation aids
| NavAid | Type | Freq | Radial / Dist magnetic |
|---|---|---|---|
| EMI · Westminster | VORTAC | 117.90 | r103° / 10.1 NM |
| MTN · Martin | TACAN | 134.10 | r310° / 18.5 NM |
| BAL · Baltimore | VORTAC | 115.10 | r357° / 19.1 NM |
| PPM · Phillips | VOR-DME | 108.40 | r281° / 27.3 NM |
| FDK · Frederick | VOR | 109.00 | r090° / 28.8 NM |
| DCA · Washington | VOR-DME | 111.00 | r028° / 39.4 NM |
VFR sectional
No published instrument procedures or Chart Supplement for 4MD9. VFR sectional link above.
Ownership & management
Remarks FAA
- PRVDD ARPT USED DALGT ONLY AND NO IFR OPERATIONS ARE CONDUCTED; THR TO RY 2 IS DSPLCD 300 FT TO PROVIDE 20:1 APCH OVER PLINE; LARGEST CLASS OF ACFT USING ARPT IS LIMITED TO 12500 LBS GROSS TKOF WGT OR LESS, TWIN ENGINE, AND CTC IS MADE WITH ATCT AT BWI ARPT.
- FOR CD CTC POTOMAC APCH AT 866-429-5882
Nearby airports
Weather is live from the Aviation Weather Center; airport facility data is from the FAA NASR (28-day cycle). For planning and education only; always verify against official sources. Open 4MD9 in a full tool: METAR/TAF decoder, crosswind calculator, sun & night times, or the density altitude calculator. Planning from here? Find the nearest airport with fuel or an approach, or check whether an IFR alternate is required.
About 4MD9
St John Airport (4MD9) is an airport in Owings Mills, MD, at 461 ft MSL. It has 1 runway, the longest 2,600 ft, with no control tower (pilot-controlled). This page shows live METAR/TAF weather, runway crosswinds, frequencies, navaids, and FAA charts for 4MD9, refreshed from the Aviation Weather Center and FAA NASR.
Does 4MD9 have a control tower?
No. St John Airport is a non-towered (pilot-controlled) airport; use the published CTAF/UNICOM on the Comms & NavAids tab.
What is the longest runway at 4MD9?
St John Airport has 1 runway; the longest is 2,600 ft. See the Runways tab for headings, surface, and lighting.
Where is 4MD9?
St John Airport is in Owings Mills, MD, at an elevation of 461 ft MSL. Coordinates: 39.4806, -76.7606.
Fly out of 4MD9 often?
Save 4MD9 as your home base in the SkyReady app for a one-tap Go/No-Go readiness brief, weather alerts, and automatic FAA currency — free to log.