I suspect this may be our guy Charley:
http://us-census.mooseroots.com/l/498957271/Charley-Spilker
Charley Spilker - 1900 Census Record Invergrove Township, Dakota County, Minnesota, United States
Charley Spilker lived in Dakota County, Minnesota in 1900. He was the head of the household, 48 years old, and identified as white. Charley was born in Germany around 1852, and both of his parents were born in Germany as well. In 1900, Charley was married to Mary Spilker, and they had five children named Mary, Charley, Gertrude, Clara, and Annie. He immigrated to the United States in 1878.