Calmar is a city located in Winneshiek County Iowa. With a 2020 population of 903, it is the 304th largest city in Iowa and the 10744th largest city in the United States . Calmar is currently declining at a rate of -0.77% annually and its population has decreased by -7.67% since the most recent census, which recorded a population of 978 in 2010. Calmar reached it's highest population of in . Spanning over 1 miles, Calmar has a population density of 816 people per square mile.
The average household income in Calmar is $61,045 with a poverty rate of 10.60%. The median rental costs in recent years comes to $861 per month, and the median house value is $136,300. The median age in Calmar is 30 years, 30.1 years for males, and 29.9 years for females.