Night Light of Jerseyville (Illinois) from space (United States) Src. Average luminocity for 10x10km area is 16.5422% and for 50x50km: 5.7653%.
Square area 10x10 km:
 1.79%
 2.6%
 1.62%
 0.65%
 2.44%
 4.55%
 1.79%
 3.08%
 2.92%
 5.52%
 73.05%Square area 50x50 km:
 0.58%
 0.67%
 0.95%
 0.57%
 1.06%
 0.94%
 0.95%
 1.18%
 1.39%
 2.7%
 89.01%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
39° 39' 48.4" North, 91° 1' 53.7" West
39° 7' 12.2" North, 90° 19' 42.4" West
38° 34' 20.8" North, 89° 37' 31.2" West
Some cities around Jerseyville sort by population:
• Upper Alton
		27.8 km =17.3 mi, 
146°
• Alton
		28.4 km =17.6 mi, 
153°
• Old Jamestown
		31.9 km =19.8 mi, 
173°
• Godfrey
		22 km =13.7 mi, 
146°
• Wood River
		35 km =21.7 mi, 
145°
• Bethalto
		34.2 km =21.3 mi, 
133°
• Black Jack
		36.7 km =22.8 mi, 
171°
• East Alton
		32.6 km =20.3 mi, 
144°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016