Notable person Dick Jensen: Member of the famous 1969-70 Iowa Hawkeyes men's basketball team Thatcher Johnson: Iowa Deputy Secretary of Agriculture, Candidate for IA Secretary of State (1980), and Candidate for IA Secretary of Agriculture (1986) References External links City-Data Comprehensive Statistical Data and more about Madrid Cities in Boone County, Iowa Cities in Iowa Populated places established in 1846 Swedish-American culture in Iowa 1846 establishments in Iowa Territory