Allison is a city located in Iowa. With a 2020 population of 966, it is the 284th largest city in Iowa and the 10462nd largest city in the United States. Allison is currently declining at a rate of -1.13% annually and its population has decreased by -6.12% since the most recent census, which recorded a population of 1,029 in 2010. Allison reached it's highest population of 1,031 in 2010. Spanning over 3 miles, Allison has a population density of 330 people per square mile.
The average household income in Allison is $69,191 with a poverty rate of 8.32%. The median rental costs in recent years comes to $520 per month, and the median house value is $88,300. The median age in Allison is 38 years, 31.3 years for males, and 45.4 years for females. For every 100 females there are 107.5 males.