Night Light of Portage (Indiana) from space (United States) Src. Average luminocity for 10x10km area is 62.2045% and for 50x50km: 29.7576%.
Square area 10x10 km:
 4.87%
 7.14%
 9.42%
 9.9%
 19.81%
 22.24%
 15.58%
 6.66%
 4.38%
 0%
 0%Square area 50x50 km:
 4.46%
 4.97%
 3.89%
 4.11%
 5.66%
 5.26%
 4.33%
 4.6%
 7.01%
 11.28%
 44.44%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
42° 5' 59" North, 87° 52' 45.4" West
41° 34' 33.1" North, 87° 10' 34.1" West
41° 2' 51.9" North, 86° 28' 22.9" West
Some cities around Portage sort by population:
• Gary
		14.3 km =8.9 mi, 
277°
• Merrillville
		16.6 km =10.3 mi, 
231°
• Valparaiso
		14.9 km =9.3 mi, 
140°
• Hobart
		8.2 km =5.1 mi, 
233°
• Chesterton
		10.1 km =6.3 mi, 
67°
• Lake Station
		5.2 km =3.2 mi, 
268°
• Lakes of the Four Seasons
		18.7 km =11.6 mi, 
189°
• South Haven
		5 km =3.1 mi, 
139°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016