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_74342 ( "LGA Name" text, "Area (km 2 )" real, "Census 2006 population" real, "Administrative capital" text, "Postal Code" real )

### Question ###
What is the 2006 census population when the area is 159?

### Accurate SQL ###

SELECT COUNT("Census 2006 population") FROM table_74342 WHERE "Area (km 2 )" = '159'