user: Question: Name the least ansi code for 609 population 2010
Columns: ['Township', 'County', 'Pop. (2010)', 'Land ( sqmi )', 'Water (sqmi)', 'Latitude', 'Longitude', 'GEO ID', 'ANSI code']
Types: ['text', 'text', 'real', 'text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Abercrombie', 'Richland', 268.0, '60.766', '0.000', '46.410346', '-96.797221', 3807700140.0, 1036846.0]
SQL:

assistant: SELECT MIN("ANSI code") FROM "Table" WHERE "Pop. (2010)" = 609.0;