Red Oak is a city located in Montgomery County Iowa. It is also the county seat of Montgomery County. With a 2020 population of 5,218, it is the 79th largest city in Iowa and the 4659th largest city in the United States . Red Oak is currently declining at a rate of -0.55% annually and its population has decreased by -9.13% since the most recent census, which recorded a population of 5,742 in 2010. Red Oak reached it's highest population of in . Spanning over 4 miles, Red Oak has a population density of 1,322 people per square mile.
The average household income in Red Oak is $61,263 with a poverty rate of 12.55%. The median rental costs in recent years comes to $642 per month, and the median house value is $82,400. The median age in Red Oak is 42.3 years, 40.2 years for males, and 43.4 years for females.