CREATE TABLE table_72715 ("City/town" TEXT, "Municipality" TEXT, "County" TEXT, "City/town status" FLOAT, "Population" FLOAT)

In which county is the city/town of Halden located?
SELECT "County" FROM table_72715 WHERE "City/town" = 'Halden'
SELECT "County" FROM "table_72715" WHERE "City/town" = 'Halden'