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There's no city there. That point is out in the middle of southern Lake Michigan, about 22.8 miles west of the Michigan shore at Grand Mere State Park near Stevensville, and about 33.7 miles east of the Illinois shore at Hartigan Park in Chicago.
Chicago, IL
Unless you think there is a merman city at the bottom of Lake Michigan, there are no cities at those coordinates. 42° N, 87° W lies in the middle of the southern part of Lake Michigan. Evanston, Illinois lies at about 42° N, 87.7° W (N 42° W 87° 41') --- so about 42° N 88° W Chicago, Illinois lies at about 41.8°N, 87.6° W (N 41° 48' W 87° 36') --- so about 42° N 88° W Gary, Indiana lies at about 41.6° N, 87.4° W (N 41° 36' W 87° 18') --- so about 42° N 87° W --- the closest to a match. Michigan City, Indiana, Bridgeman, Michigan, and St. Joseph, Michigan also lie in the same vicinity.
Indiana is at 41 degrees north and 87 degrees west.
Lake Michigan
There's no city there. That point is smack in the middle of the Bosten Hu lake, in northwestern China. It's about 125 miles south-southwest of the city of Ürümqi.
Chicago, the largest city in Illinois, is located at 42 degrees North and 87 degrees west. Chicago is located at the SW tip of Lake Michigan.
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There is no city at 42°N 87°W. That location is the center of Lake Bostan in the Peoples Republic of China, about three and a half miles due east of the center of the city of Bohu.
45 -87 = -42
87+42+78 = 207
0.4828
42 N 87 W is Lake Michigan, United States.
Berrien County, MI, USA (Lake Michigan).
1, 87 can't be divded by anything other than 1 or 87 but that doesn't work with 42
-42