Passage: As of the census of 2010, there were 1,124 people, 460 households, and 286 families residing in the city. The population density was 624.4 inhabitants per square mile (241.1/km2). There were 522 housing units at an average density of 290.0 per square mile (112.0/km2). The racial makeup of the city was 98.5% White, 0.2% African American, 0.4% Asian, 0.1% from other races, and 0.9% from two or more races. Hispanic or Latino of any race were 1.4% of the population.

Question: How high was the population density?
624.4 inhabitants per square mile