user: Question: How many city/municipalties have an area (km2) of 506.64?
Columns: ['City / Municipality', 'Date of Creation', 'Area (km 2 )', 'Population (2010)', 'Income Classification ( DOF )']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Baungon', 'July 1, 1956', '175.86', 32868.0, '2nd Class Municipality']
SQL:

assistant: SELECT COUNT("City / Municipality") FROM "Table" WHERE "Area (km 2 )" = '506.64';