Arcadia is a city in Iron County, Missouri, United States. The population was 608 at the 2010 census.
Arcadia was laid out and platted in 1849. It was named after the Greek region of Arcadia. A post office called Arcadia has been in operation since 1871.
According to the United States Census Bureau, the city has a total area of 0.84 square miles (2.18 km2), of which 0.83 square miles (2.15 km2) is land and 0.01 square miles (0.03 km2) is water.
As of the census of 2010, there were 608 people, 293 households, and 164 families living in the city. The population density was 732.5 inhabitants per square mile (282.8/km2). There were 320 housing units at an average density of 385.5 per square mile (148.8/km2). The racial makeup of the city was 99.0% White, 0.7% African American, 0.2% Native American, and 0.2% from two or more races. Hispanic or Latino of any race were 1.3% of the population.
There were 293 households, of which 22.2% had children under the age of 18 living with them, 41.3% were married couples living together, 9.9% had a female householder with no husband present, 4.8% had a male householder with no wife present, and 44.0% were non-families.