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 city ( Official_Name VARCHAR, Population VARCHAR )

### Question ###
Find the official names of cities with population bigger than 1500 or smaller than 500.

### Accurate SQL ###

SELECT Official_Name FROM city WHERE Population > 1500 OR Population < 500