It appears there were several POW camps in the midwest.

The POW Camps in Nebraska during World War II included:

•Alma, Harlan County, NE (branch camp under Atlanta, NE)
•Arapahoe, Furnas County, NE (branch camp under Indianola, NE)
•Atlanta (Camp), Atlanta, Phelps County, NE (base camp)
•Bayard, Morrill County, NE (branch camp under Scottsbluff, NE)
•Benkelman, Dundy County, NE (branch camp under Atlanta, NE)
•Bertrand, Phelps County, NE (branch camp under Atlanta, NE)
•Bridgeport, Morrill County, NE (branch camp under Scottsbluff, NE)
•Cornhusker, Hall County, NE (branch camp under Atlanta, NE), now Cornhusker State Wildlife Management Area
•Crook (Fort George), Bellevue, Sarpy County, NE (base camp), now Offutt Air Force Base
•Elwood, Gosper County, NE (branch camp under Atlanta, NE)
•Fisher's Farm, Sarpy County, NE (branch camp under Algona, IA)
•Franklin, Franklin County, NE (branch camp under Atlanta, NE)
•Grand Island, Hall County, NE (branch camp under Atlanta, NE)
•Hastings, Adams County, NE (branch camp under Atlanta, NE)
•Hayes Center, Hayes County, NE (branch camp under Indianola, NE)
•Hebron, Thayer County, NE (branch camp under Atlanta, NE)
•Indianola (Camp), Indianola, Red Willow County, NE (base camp)
•Kearney, Buffalo County, NE (branch camp under Atlanta, NE)
•Lexington, Dawson County, NE (branch camp under Atlanta, NE)
•Lyman, Scotts Bluff County, NE (branch camp under Scottsbluff, NE)
•Mitchell, Scotts Bluff County, NE (branch camp under Scottsbluff, NE)
•Ogallala, Keith County, NE (branch camp under Indianola, NE)
•Omaha, Douglas County, NE
•Palisade, Hayes and Hitchcock Counties, NE (branch camp under Indianola, NE)
•Robinson (Fort), Crawford, Dawes County, NE (base camp) (POWs originally buried here were transferred to Camp Butler National Cemetery in Springfield, IL)
•Scottsbluff (Camp), Scottsbluff, Scotts Bluff County, NE (base camp)
•Sidney, Cheyenne County, NE (branch camp under Carson, CO, sometimes Scottsbluff, NE)
•Weeping Water, Cass County, NE (branch camp under Atlanta, NE)
•West Point, Cuming County, NE (branch camp under Clarinda, IA)


http://www.gentracer.org/powcampsNE.html