Irondale is a city in Washington County, Missouri, United States. The population was 445 at the 2010 census.
Irondale is located at 37°50′7″N 90°40′21″W (37.835204, -90.672505). According to the United States Census Bureau, the city has a total area of 0.54 square miles (1.40 km²), of which, 0.53 square miles (1.37 km²) is land and 0.01 square miles (0.03 km²) is water.
As of the census of 2010, there were 445 people, 160 households, and 122 families residing in the city. The population density was 839.6 inhabitants per square mile (324.2/km²). There were 192 housing units at an average density of 362.3 per square mile (139.9/km²). The racial makeup of the city was 97.5% White, 0.2% Native American, and 2.2% from two or more races. Hispanic or Latino of any race were 0.9% of the population.
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