Arco is a city located in Butte County Idaho. It is also the county seat of Butte County. With a 2020 population of 890, it is the 93rd largest city in Idaho and the 10800th largest city in the United States . Arco is currently growing at a rate of 0.56% annually but its population has decreased by -10.55% since the most recent census, which recorded a population of 995 in 2010. Arco reached it's highest population of 992 in 2010. Spanning over 1 miles, Arco has a population density of 833 people per square mile.
The average household income in Arco is $63,356 with a poverty rate of 34.29%. The median rental costs in recent years comes to $592 per month, and the median house value is $75,700. The median age in Arco is 40.6 years, 42.8 years for males, and 40.4 years for females.