CREATE TABLE table_25577 ("Rank" FLOAT, "Incorporated place" TEXT, "Metropolitan area" TEXT, "State" TEXT, "Population  ( 2010 census ) " FLOAT, "Land area  ( mi 2  ) " TEXT, "Population density  ( people per mi 2  ) " TEXT)

How many states had a population density of 10188.8?
SELECT COUNT("State") FROM table_25577 WHERE "Population density (people per mi 2 )" = '10188.8'
SELECT COUNT("State") FROM "table_25577" WHERE "Population density (people per mi 2 )" = '10188.8'