SELECT "Area km 2" FROM table_1618 WHERE "Census Ranking" = '1,608 of 5,008'
What is the Area KM 2 of the place that has a Census ranking of 1,608 of 5,008?
CREATE TABLE table_1618 (
    "Official Name" text,
    "Status" text,
    "Area km 2" text,
    "Population" real,
    "Census Ranking" text
)