CREATE TABLE table_261222_1 (city___municipality VARCHAR2, area__km_2__ VARCHAR2)

How many city/municipalties have an area (km2) of 506.64?
SELECT COUNT(city___municipality) FROM table_261222_1 WHERE area__km_2__ = "506.64"
SELECT COUNT("city___municipality") FROM "table_261222_1" WHERE "506.64" = "area__km_2__"