Irmo is a city located in Richland County South Carolina. With a 2020 population of 12,719, it is the 35th largest city in South Carolina and the 2602nd largest city in the United States . Irmo is currently growing at a rate of 0.94% annually and its population has increased by 14.62% since the most recent census, which recorded a population of 11,097 in 2010. Irmo reached it's highest population of in . Spanning over 7 miles, Irmo has a population density of 1,857 people per square mile.
The average household income in Irmo is $77,667 with a poverty rate of 9.09%. The median rental costs in recent years comes to $1,126 per month, and the median house value is $125,000. The median age in Irmo is 38.7 years, 36.2 years for males, and 40.5 years for females.