Allison is a city located in Iowa. With a 2020 population of 955, it is the 289th largest city in Iowa and the 10504th largest city in the United States. Allison is currently declining at a rate of -0.93% annually and its population has decreased by -7.19% since the most recent census, which recorded a population of 1,029 in 2010. Allison reached it's highest population of 1,026 in 2010. Spanning over 3 miles, Allison has a population density of 326 people per square mile.
The average household income in Allison is $58,900 with a poverty rate of 11.01%. The median rental costs in recent years comes to $516 per month, and the median house value is $89,600. The median age in Allison is 42.3 years, 39.2 years for males, and 47.4 years for females. For every 100 females there are 90.5 males.