CREATE TABLE table_204_279 (id DECIMAL, "name of place" TEXT, "number\ of\ counties" DECIMAL, "principal\ county" TEXT, "zip code\ lower" DECIMAL, "zip code\ upper" DECIMAL)

how many low zip codes are there in total ?
SELECT COUNT("zip code\nlower") FROM table_204_279
SELECT COUNT("zip code\nlower") FROM "table_204_279"