Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_22916979_1 ( state VARCHAR, population_density__people_per_mi_2__ VARCHAR )

### Question ###
How many states had a population density of 10188.8?

### Accurate SQL ###

SELECT COUNT(state) FROM table_22916979_1 WHERE population_density__people_per_mi_2__ = "10188.8"