During the 19th and 20th centuries, 37 new states were added to the original 13 as the nation expanded across the North American continent and acquired a number of overseas possessions.
United States Government Dependent areas are American Samoa, Baker Island, Guam, Howland Island, Jarvis Island, Johnston Atoll, Kingman Reef, Midway Islands, Navassa Island, Northern Mariana Islands, Palmyra Atoll, Puerto Rico, Virgin Islands, Wake Island; note: from 18 July 1947 until 1 October 1994, the US administered the Trust Territory of the Pacific Islands; it entered into a political relationship with all four political units: the Northern Mariana Islands is a commonwealth in political union with the US (effective 3 November 1986); the Republic of the Marshall Islands signed a Compact of Free Association with the US (effective 21 October 1986); the Federated States of Micronesia signed a Compact of Free Association with the US (effective 3 November 1986); Palau concluded a Compact of Free Association with the US (effective 1 October 1994)
Iowa Latitude Facts: 42.0046 and Iowa Longitude Facts: -93.214
United States People Age structure (%) 0-14 years: 20.1% (male 31,257,108/female 29,889,645); 15-64 years: 67.1% (male 101,825,901/female 102,161,823); 65 years and over: 12.7% (male 16,263,255/female 22,426,914) (2008 estimate)
United States People Languages (%) English 82.1%, Spanish 10.7%, other Indo-European 3.8%, Asian and Pacific island 2.7%, other 0.7% (2000 census); note: Hawaiian is an official language in the state of Hawaii
Adair County Adams County Allamakee County Appanoose County Audubon County Benton County Black Hawk County Boone County Bremer County Buchanan County Buena Vista County Butler County Calhoun County Carroll County Cass County Cedar County Cerro Gordo County Cherokee County Chickasaw County Clarke County Clay County Clayton County Clinton County Crawford County Dallas County Davis County Decatur County Delaware County Des Moines County Dickinson County Dubuque County Emmet County Fayette County Floyd County Franklin County Fremont County Greene County Grundy County Guthrie County Hamilton County Hancock County Hardin County Harrison County Henry County Howard County Humboldt County Ida County Iowa County Jackson County Jasper County Jefferson County Johnson County Jones County Keokuk County Kossuth County Lee County Linn County Louisa County Lucas County Lyon County Madison County Mahaska County Marion County Marshall County Mills County Mitchell County Monona County Monroe County Montgomery County Muscatine County Obrien County Osceola County Page County Palo Alto County Plymouth County Pocahontas County Polk County Pottawattamie County Poweshiek County Ringgold County Sac County Scott County Shelby County Sioux County Story County Tama County Taylor County Union County Van Buren County Wapello County Warren County Washington County Wayne County Webster County Winnebago County Winneshiek County Woodbury County Worth County Wright County
United States People Sex ratio (male(s)/female) at birth: 1.05 male(s)/female; under 15 years: 1.05 male(s)/female; 15-64 years: 1 male(s)/female; 65 years and over: 0.72 male(s)/female; total population: 0.97 male(s)/female (2008 estimate)