How many states had a population density of 10188.8?
CREATE TABLE "incorporated_places_with_a_density_of_ov" (
  "rank" real,
  "incorporated_place" text,
  "metropolitan_area" text,
  "state" text,
  "population_2010_census" real,
  "land_area_mi_2" text,
  "population_density_people_per_mi_2" text
);
SELECT COUNT("state") FROM "incorporated_places_with_a_density_of_ov" WHERE "population_density_people_per_mi_2"='10188.8';