Night Light of Portsmouth (Ohio) from space (United States) Src. Average luminocity for 10x10km area is 34.1463% and for 50x50km: 6.5338%.
Square area 10x10 km:
 4.25%
 6.8%
 2.72%
 1.87%
 4.76%
 5.27%
 10.37%
 5.61%
 9.18%
 26.19%
 22.96%Square area 50x50 km:
 0.37%
 0.84%
 0.51%
 0.87%
 1.03%
 0.88%
 1.55%
 1.31%
 1.66%
 5.93%
 85.06%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
39° 16' 41.3" North, 83° 42' 2.9" West
38° 43' 54.3" North, 82° 59' 51.6" West
38° 10' 52.1" North, 82° 17' 40.4" West
Some cities around Portsmouth sort by population:
• Meads
		43.5 km =27 mi, 
144°
• Ironville
		40.5 km =25.2 mi, 
139°
• Ashland
		42.1 km =26.2 mi, 
132°
• Ironton
		34.9 km =21.7 mi, 
128°
• Flatwoods
		33.7 km =20.9 mi, 
133°
• Wheelersburg
		12.3 km =7.6 mi, 
90°
• Jackson
		47.4 km =29.5 mi, 
41°
• Wellston
		59.3 km =36.8 mi, 
42°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016