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_216776_2 (municipal_mayor VARCHAR, area__km²_ VARCHAR)

### Question ###
How many different municipal mayors were there in the municipality with an area of 42.66 km2?

### Accurate SQL ###

SELECT COUNT(municipal_mayor) FROM table_216776_2 WHERE area__km²_ = "42.66"