Night Light of Norwalk (Ohio) from space (United States) Src. Average luminocity for 10x10km area is 30.1753% and for 50x50km: 9.3488%.
Square area 10x10 km:
 2.11%
 5.19%
 3.08%
 3.41%
 5.84%
 4.87%
 3.73%
 5.52%
 6.33%
 37.5%
 22.4%Square area 50x50 km:
 0.88%
 1.36%
 1.14%
 0.84%
 1.16%
 1.46%
 1.48%
 1.47%
 2.12%
 8.91%
 79.2%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
41° 46' 8.8" North, 83° 19' 7.9" West
41° 14' 33.2" North, 82° 36' 56.6" West
40° 42' 42.2" North, 81° 54' 45.4" West
Some cities around Norwalk sort by population:
• Sandusky
		24.2 km =15 mi, 
341°
• Vermilion-on-the-Lake
		32 km =19.9 mi, 
49°
• Vermilion
		28.9 km =18 mi, 
46°
• Oberlin
		33.8 km =21 mi, 
80°
• Bellevue
		19.2 km =11.9 mi, 
280°
• Huron
		17.7 km =11 mi, 
16°
• Clyde
		30.8 km =19.1 mi, 
282°
• Willard
		23 km =14.3 mi, 
203°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016