Smallest for me is Duncan BC, Canada
Duncan Airport IATA: N/A - ICAO: CAM3
Summary Airport type Public
Serves Duncan, British Columbia
Elevation AMSL 300 ft (91 m)
Coordinates 48°45′30″N, 123°43′00″W
Runways
Direction 13/31
Length 1,520 ft, 463m
Surface Asphalt
Back then it was 1/2 gravel, 1/2 paved.
Does is count that I flew in myself