Irwin, Pennsylvania
31D Inter County
Inter County (31D) is a non-towered, public-use airport in Irwin, Pennsylvania, at 1,250 ft MSL. Its runway is E/W (1,800 by 120 ft, turf). CTAF 122.9.
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 31D
- Location
- Irwin, Pennsylvania (Westmoreland County). 4 NM W of the city center
- Elevation
- 1,250 ft MSL
- Position
- 40.3334° N, 79.7792° W
- Control tower
- No, non-towered
- Sectional chart
- Detroit
- Magnetic variation
- 8° W (1985)
- Ownership
- Privately owned, open to the public
- Attendance
- Irregular
1 runway
Runways
| Runway | Length × width | Surface | Edge lights |
|---|---|---|---|
| E/W | 1,800 × 120 ft | Turf, fair condition | Not listed |
Runway ends and traffic pattern
| End | Pattern | Glide slope lights | Instrument | Displaced threshold | Landing distance |
|---|---|---|---|---|---|
| E | Left traffic | None listed | None listed | None listed | Not listed |
| W | Left traffic | None listed | None listed | None listed | Not listed |
VHF
Frequencies
- CTAF
- 122.9
Before you go
Brief 31D in Ascent EFB.
Current weather, NOTAMs and the airport diagram for Inter 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.