CREATE TABLE table_2500440_1 (population_density__per_km_2__ VARCHAR, municipal_district VARCHAR)

What is the density per km in Smoky Lake County?
SELECT population_density__per_km_2__ FROM table_2500440_1 WHERE municipal_district = "Smoky Lake County"
SELECT "population_density__per_km_2__" FROM "table_2500440_1" WHERE "Smoky Lake County" = "municipal_district"