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Davenport, Ia
Brooklyn, Missouri.
Brule, NE
Stockton, IA
Gary, IN
Cincinnati, OH
West Des Moines, Iowa
Des Moines, IA
Hillsdale, IL
According to Google Maps - the halfway point would be somewhere close to Toledo, OH
== == The best I can calculate -- using my Rand McNally Route Planner -- is that the mid-point is at or near the town of Arispie, Iowa. Arispie is located about 54 miles SSW of Des Moines, Iowa, and about 90 miles SSE of Omaha, Nebraska. You can use meetways.com to find the exact mid point between 2 places.
Bloomington, Il is at the midpoint.