alexandria,_indiana | populationdensity | 7553 (inhabitants per square kilometre) <sep> alexandria is a city in monroe township, madison county, indiana, united states it is about 48 miles (77 km) northeast of indianapolis according to the 2020 census, its population was 5,149, nearly unchanged from 2010 
the population density of alexandria. indiana is 755.3 inhabitants per sq km.no information