Knapps Island
Island in Mason County, Illinois · on the USGS Astoria quadrangle
40.12616, -90.30123
Maps that show Knapps Island
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Astoria, IL
USGS topo, 2024
Beardstown, IL
USGS historical 15-minute topo (1926)
Beardstown, IL
USGS historical 15-minute topo (1944)
Bureau of Land Management Eastern States Overview map
BLM Eastern States (2019)
IFR Enroute Low Altitude Chart L-27 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-05 (U.S.)
FAA, 2026-10-29
Nearby
Name, class, county and location: USGS Geographic Names Information System (public domain).