 The per capita income for the city was $17,558.About 9.3% of families and 13.0% of the population were below the poverty line, including 15.6% of those under age 18 and 13.6% of those age 65 or over.Mount Rainier has a council-manager form of government with a city manager who oversees each of the city's departments and day-to-day operations of the city.