CREATE TABLE table_2500440_1 (population_density__per_km_2__ VARCHAR2, name VARCHAR2)

What is the population density in Buffalo Lake?
SELECT population_density__per_km_2__ FROM table_2500440_1 WHERE name = "Buffalo Lake"
SELECT "population_density__per_km_2__" FROM "table_2500440_1" WHERE "Buffalo Lake" = "name"