"-6" . "2.999e+07"^^ . . "20808"^^ . . "Mayor"@en . . "Mayor Pro-Tem"@en . "3.09245e+07"^^ . "63010" . "693.787"^^ . "Arnold, Missouri"@en . "184.404"^^ . "636" . "932396.0"^^ . . . "930000.0"^^ . . "2.99921e+07"^^ . . "3.092e+07"^^ . "Arnold is the largest city in Jefferson County, Missouri, United States. The population was 20,808 at the 2010 census."@en . "184.0"^^ . "-5" . "693.8"^^ . .