Sam Hoskins’ first-half strike did the damage as Cobblers hung on for all the points.
It leaves them trailing Carlisle by a single point and Stevenage by three points, though both sides have a game in hand on Northampton.
The win also gives Cobblers a valuable eight point cushion on Mansfield in eighth.
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The win also gives Cobblers a valuable eight point cushion on Mansfield in eighth.