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_27615445_1 ( audition_city VARCHAR, episode_air_date VARCHAR )

### Question ###
How many audition city's are there with an episode air date of June 24, 2010?

### Accurate SQL ###

SELECT COUNT(audition_city) FROM table_27615445_1 WHERE episode_air_date = "June 24, 2010"