CREATE TABLE table_13620 ("School" CLOB, "Location" CLOB, "Mascot" CLOB, "Enrollment" FLOAT, "IHSAA Class" CLOB, "# / County" CLOB)

What is the location where enrollment is 266 and and the county is 18 Delaware?
SELECT "Location" FROM table_13620 WHERE "# / County" = '18 delaware' AND "Enrollment" = '266'
SELECT "Location" FROM "table_13620" WHERE "# / County" = '18 delaware' AND "Enrollment" = '266'