 According to the 2010 United States Census, Avalon had a median household income of $65,433, with 12.5% of the population living below the federal poverty line.As of the census of 2000, there were 3,127 people, 1,158 households, and 719 families residing in the city.The population density was 1,112.4 inhabitants per square mile (429.7/km2).