Night Light of Clayton (California) from space (United States) Src. Average luminocity for 10x10km area is 27.4318% and for 50x50km: 29.0913%.
Square area 10x10 km:
 1.46%
 1.14%
 0.32%
 3.25%
 4.38%
 11.04%
 7.14%
 3.08%
 18.02%
 25.65%
 24.51%Square area 50x50 km:
 4.31%
 4.06%
 1.52%
 3.95%
 5.31%
 6.66%
 5.21%
 4.07%
 11.15%
 16%
 37.75%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
38° 29' 36.4" North, 122° 38' 20.1" West
37° 56' 27.7" North, 121° 56' 8.8" West
37° 23' 3.9" North, 121° 13' 57.6" West
Some cities around Clayton sort by population:
• Concord
		9.3 km =5.8 mi, 
296°
• Pittsburg
		10.7 km =6.6 mi, 
24°
• Walnut Creek
		12 km =7.5 mi, 
251°
• Pleasant Hill
		11 km =6.8 mi, 
274°
• Bay Point
		10 km =6.2 mi, 
346°
• Alamo
		13.2 km =8.2 mi, 
219°
• Contra Costa Centre
		10.8 km =6.7 mi, 
262°
• Waldon
		10.6 km =6.6 mi, 
261°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016