ICAO		IATA		Other		Location
KEFC				EFC		Belle Fourche [Muni], South Dakota, US (17 mi / 28 km NE)
				W43		Hulett [Muni], Wyoming, US (19 mi / 31 km W)
				SD91		Spearfish [Star Aviation Number 1 Heliport], South Dakota, US (22 mi / 35 km SE)
KSPF		SPF		SPF		Spearfish [Black Hills-Clyde Ice Field], South Dakota, US (22 mi / 36 km SE)
				SD90		Spearfish [Mitchells Strip], South Dakota, US (23 mi / 37 km SE)
				WY14		Hulett [Ipy Ranch Airport], Wyoming, US (25 mi / 40 km W)
				WY55		Sundance [Taylor Field], Wyoming, US (25 mi / 41 km SW)
				DETO		Devils Tower National Monument [Devils Tower NM], Wyoming, US (26 mi / 43 km W)
				WY56		Hulett [Pierce Ranch Airport], Wyoming, US (30 mi / 48 km NW)
				3SD5		Lead [Dilligaf Heliport], South Dakota, US (35 mi / 56 km SE)
				01WY		Moorcroft [Keyhole Airport], Wyoming, US (37 mi / 60 km SW)
				2SD5		Sturgis [Sturgis Heliport], South Dakota, US (37 mi / 60 km SE)
				WY53		Four Corners [Moburg Aero Airport], Wyoming, US (39 mi / 62 km S)
				SD26		Sturgis [Mike Jacob Sturgis Heliport], South Dakota, US (39 mi / 63 km SE)
				11WY		Hulett [Thompson Creek Oilfield Airport], Wyoming, US (40 mi / 65 km NW)
				SD35		Sturgis [Bruch Airfield], South Dakota, US (40 mi / 65 km E)
				SD24		Sturgis [Eden Valley Airport], South Dakota, US (41 mi / 66 km E)
				49B		Sturgis [Muni], South Dakota, US (43 mi / 69 km E)
				MT50		Alzada [Lanning Ranch Airport], Montana, US (44 mi / 71 km NW)
				83V		Upton [Muni], Wyoming, US (44 mi / 71 km SW)