Armstrong is a city located in Emmet County Iowa. With a 2020 population of 842, it is the 322nd largest city in Iowa and the 11055th largest city in the United States . Armstrong is currently growing at a rate of 0.12% annually but its population has decreased by -9.07% since the most recent census, which recorded a population of 926 in 2010. Armstrong reached it's highest population of in . Spanning over 1 miles, Armstrong has a population density of 962 people per square mile.
The average household income in Armstrong is $51,703 with a poverty rate of 11.74%. The median rental costs in recent years comes to $586 per month, and the median house value is $72,400. The median age in Armstrong is 51.3 years, 43.2 years for males, and 55.9 years for females.