  fremont county is a county located in the u.s. state of iowa. as of the 2010 census, the population was 7,441. the county seat is sidney. the county was formed in 1847 and named for the military officer john c. fremont. ==geography== according to the u.s. census bureau, the county has a total area of , of which  is land and  (1.1%) is water. ===major highways=== *20px interstate 29 *20px u.s. highway 59 *20px u.s. highway 275 *20px iowa highway 2 *20px iowa highway 333 ===adjacent counties=== *mills county (north) *page county (east) *atchison county, missouri (south) *otoe county, nebraska (southwest) *cass county, nebraska (northwest) ==demographics== {{uscensuspop | 1850 = 1244 | 1860 = 5074 | 1870 = 11174 | 1880 = 17652 | 1890 = 16842 | 1900 = 18546 | 1910 = 15623 | 1920 = 15447 | 1930 = 15533 | 1940 = 14645 | 1950 = 12323 | 1960 = 10282 | 1970 = 9282 | 1980 = 9401 | 1990 = 8226 | 2000 = 8010 | 2010 = 7441 |estyear=2013 |estimate=7080 |footnote=u.s. decennial census1790-1960{{cite web|url=http://mapserver.lib.virginia.edu|title=historical census browser|publisher=university of virginia library|accessdate=july 17, 
1847_establishments_in_Iowa Fremont_County,_Iowa Iowa_counties Iowa_counties_on_the_Missouri_River Populated_places_established_in_1847