Monmouth, Illinois
C66 Monmouth Muni
Monmouth Muni (C66) is a non-towered, public-use airport in Monmouth, Illinois, at 753 ft MSL. Its runway is 03/21 (2,899 by 60 ft, asphalt). CTAF 122.8.
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 C66
- Location
- Monmouth, Illinois (Warren County). 2 NM N of the city center
- Elevation
- 753 ft MSL
- Position
- 40.9297° N, 90.6311° W
- Control tower
- No, non-towered
- Sectional chart
- Chicago
- Magnetic variation
- 3° E (1980)
- Fuel
- 100LL, Mogas
- Ownership
- Publicly owned, open to the public
- Attendance
- TUE-SUN 0800-1630
1 runway
Runways
| Runway | Length × width | Surface | Edge lights |
|---|---|---|---|
| 03/21 | 2,899 × 60 ft | Asphalt, good condition | Medium intensity |
Runway ends and traffic pattern
| End | Pattern | Glide slope lights | Instrument | Displaced threshold | Landing distance |
|---|---|---|---|---|---|
| 03 | Left traffic | 2-light PAPI, left | None listed | None listed | Not listed |
| 21 | Left traffic | 2-light PAPI, left | None listed | None listed | Not listed |
VHF
Frequencies
- CTAF
- 122.8
- Actvt Papi Rwy 03 & 21; Mirl Rwy 03/21 Preset Low Intst, To Incr Intst & Actvt - Ctaf.
- UNICOM
- 122.8
- Clearance delivery
- 120.7
- Approach / departure
- 133.275
- "Quad City"
Before you go
Brief C66 in Ascent EFB.
Current weather, NOTAMs and the airport diagram for Monmouth Muni, 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.