Grinnell is a city located in Poweshiek County Iowa. With a 2020 population of 9,134, it is the 45th largest city in Iowa and the 3289th largest city in the United States . Grinnell is currently growing at a rate of 0.10% annually but its population has decreased by -0.91% since the most recent census, which recorded a population of 9,218 in 2010. Grinnell reached it's highest population of in . Spanning over 6 miles, Grinnell has a population density of 1,615 people per square mile.
The average household income in Grinnell is $68,673 with a poverty rate of 13.27%. The median rental costs in recent years comes to $739 per month, and the median house value is $137,500. The median age in Grinnell is 37.1 years, 31.4 years for males, and 39.8 years for females.