Fontanelle is a city located in Adair County Iowa. With a 2020 population of 638, it is the 392nd largest city in Iowa and the 12258th largest city in the United States . Fontanelle is currently growing at a rate of 1.27% annually but its population has decreased by -5.06% since the most recent census, which recorded a population of 672 in 2010. Fontanelle reached it's highest population of in . Spanning over 1 miles, Fontanelle has a population density of 668 people per square mile.
The average household income in Fontanelle is $66,561 with a poverty rate of 16.56%. The median rental costs in recent years comes to $569 per month, and the median house value is $70,300. The median age in Fontanelle is 37.8 years, 34.5 years for males, and 43.2 years for females.