This is most likely him too:
1910 census, 5-Wd Davenport, Scott Co., Iowa
Krone, Charles, head, age 48, married once, married at age 41, born Iowa, parents born in Germany, occupation machinist
Krone, Emma, wife, age 35, married once, married at age 28, had not given birth to any children, born in Germany as were her parents.
1900 census, English River Dist, Washington Co., Iowa
Krone, Martin, head, born Oct. 1823, age 76, married for 48 years, born in Germany as were his parents, immigrated to US in 1832, lived in US for 48 years, naturalized, farmer
Krone, Teresa, wife, born June or Jan. 1831, age 69, married for 48 years, had given birth to 11 children and all were living, born in Germany as were her parents, same immigration info as Martin except she is not listed as naturalized.
Krone, John, son, born Dec. 1855, age 44, single, born Iowa, farmer
Krone, Charlie, son, born Sept. 1863, age 36, single, born Iowa, farm laborer
Krone, Elizabeth, daughter, born Sept. 1863, age 36, single, born Iowa
Krone, George, son, born Mar. 1873, age 27, single, born Iowa, farm laborer
Krone, Henry, son, born Apr. 1876, age 24, single, born Iowa, farm laborer
1880 census, English River Dist, Washington Co., Iowa
Martin and Teresa Krone are listed as from Baden, Germany as are their parents.Their children are:
Joseph, age 25
They are living in a German community; every head of household on this census page was born in Baden or Bohemia.