CREATE TABLE table_77209 ("Official Name" CLOB, "Status" CLOB, "Area km 2" FLOAT, "Population" FLOAT, "Census Ranking" CLOB)

What is the Area of the Saint-Isidore Parish with a Population smaller than 4,268?
SELECT SUM("Area km 2") FROM table_77209 WHERE "Population" < '4,268' AND "Official Name" = 'saint-isidore'
SELECT SUM("Area km 2") FROM "table_77209" WHERE "Official Name" = 'saint-isidore' AND "Population" < '4,268'