Night Light of Mount Vernon (Indiana) from space (United States) Src. Average luminocity for 10x10km area is 29.151% and for 50x50km: 5.7882%.
Square area 10x10 km:
 3.73%
 6.49%
 3.41%
 2.6%
 5.03%
 3.9%
 2.11%
 2.44%
 3.57%
 34.9%
 31.82%Square area 50x50 km:
 0.46%
 0.7%
 0.64%
 0.48%
 0.71%
 1.12%
 0.88%
 1.16%
 1.34%
 4.44%
 88.08%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
38° 29' 5.1" North, 88° 35' 53.4" West
37° 55' 56.2" North, 87° 53' 42.1" West
37° 22' 32.2" North, 87° 11' 30.9" West
Some cities around Mount Vernon sort by population:
• Evansville
		30.1 km =18.7 mi, 
80°
• Owensboro
		70.8 km =44 mi, 
104°
• Henderson
		28.8 km =17.9 mi, 
111°
• Harrisburg
		60.7 km =37.7 mi, 
249°
• Princeton
		55.1 km =34.2 mi, 
31°
• Boonville
		55.9 km =34.7 mi, 
76°
• Carmi
		29.1 km =18.1 mi, 
307°
• Fairfield
		64.2 km =39.9 mi, 
320°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016