CREATE TABLE table_22976 ("Rank 2011" FLOAT, "Change since 2006" TEXT, "Urban Area" TEXT, "County" TEXT, "Population 2011" FLOAT, "Increase since 2006" TEXT)

In what counties is the 2011 population 17908?
SELECT "County" FROM table_22976 WHERE "Population 2011" = '17908'
SELECT "County" FROM "table_22976" WHERE "Population 2011" = '17908'