user: Question: What is the population of Northfield parish that has an area less than 342.4?
Columns: ['Official Name', 'Status', 'Area km 2', 'Population', 'Census Ranking']
Types: ['text', 'text', 'real', 'real', 'text']
Sample row: ['Lincoln', 'Parish', 159.83, 6458.0, '579 of 5,008']
SQL:

assistant: SELECT "Population" FROM "Table" WHERE "Area km 2" < 342.4 AND "Official Name" = 'Northfield';