Night Light of Alton (Illinois) from space (United States) Src. Average luminocity for 10x10km area is 55.7772% and for 50x50km: 38.0934%.
Square area 10x10 km:
 12.76%
 13.1%
 7.48%
 4.59%
 7.31%
 6.63%
 4.25%
 7.65%
 25.85%
 10.37%
 0%Square area 50x50 km:
 8.66%
 8.99%
 5.36%
 4.59%
 5.99%
 5.62%
 3.92%
 3.46%
 5.78%
 6.14%
 41.49%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
39° 26' 8.7" North, 90° 53' 14.7" West
38° 53' 26.2" North, 90° 11' 3.4" West
38° 20' 28.4" North, 89° 28' 52.2" West
Some cities around Alton sort by population:
• Upper Alton
		3.7 km =2.3 mi, 
51°
• Spanish Lake
		11.8 km =7.3 mi, 
193°
• Old Jamestown
		10.7 km =6.6 mi, 
234°
• Godfrey
		7.2 km =4.5 mi, 
358°
• Wood River
		8.2 km =5.1 mi, 
113°
• Bethalto
		12.6 km =7.8 mi, 
80°
• Black Jack
		13 km =8.1 mi, 
213°
• East Alton
		6.4 km =4 mi, 
100°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016