Luke Guttridge's header saw off AFC Wimbledon as Northampton picked up only their second home win of the season.
The Cobblers dominated early on as Guttridge drew a save from Seb Brown, with Adebayo Akinfenwa heading over from the resulting corner.
Clarke Carlisle had a header cleared off the line, while Jason Euell missed two chances for the visitors.
Guttridge nodded the winner after Brown could only deflect substitute Toni Silva's shot into his path.
The goal handed Northampton their second win in 18 league matches.
VIEWS FROM THE DRESSING ROOM
Northampton Town manager Aidy Boothroyd tells BBC Radio Northampton:
"I'm pleased, I know our fans are pleased and it's a deserved win as well.
"Psychologically, I think a clean sheet is worth four points. My fears were that we were so desperate to win that we might get caught on the counter-attack.
"It's about getting points on the board. I think our energy and form are on an upward curve.
"Luke Guttridge said to me when he signed that he'd get goals and that we won't go down with him in the team, and I think he's right."
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Live Text Commentary
Full Time The final whistle goes and the game is over.90:00 +6:51
Jason Euell is flagged offside by the assistant referee. Indirect free kick taken by Freddy Hall.90:00 +4:34 Substitution
Substitution (Northampton) makes a substitution, with Freddy Hall coming on for Chris Weale.90:00 +2:43
Sammy Moore has an effort at goal from a long way out that goes wide left.87:37 Substitution
Substitution (Northampton) makes a substitution, with Byron Webster coming on for Jake Robinson.86:22
Inswinging corner taken by Jason Euell.83:44
Free kick crossed by Rashid Yussuff, clearance made by Clarke Carlisle.83:44 Booking
Booking Brett Williams is cautioned by the ref for unsporting behaviour.83:29
Brett Williams concedes a free kick for a foul on Sammy Moore.82:33
Corner taken by Ben Harding, Seb Brown makes a save.81:47
Toni Brito Silva fouled by Gavin Hoyte, the ref awards a free kick. Ben Harding crosses the ball from the free kick left-footed from right channel, clearance by Jason Euell.81:11 Substitution
Substitution Samuel Hatton joins the action as a substitute, replacing Gareth Gwillim.80:18
The assist for the goal came from Toni Brito Silva.80:18 Goal scored
Goal! - Luke Guttridge - Northamp'n 1 - 0 Wimbledon Luke Guttridge grabs a headed goal from inside the penalty box. Northampton 1-0 AFC Wimbledon.79:36
Toni Brito Silva takes a shot. Save by Seb Brown.73:26
Chris Weale restarts play with the free kick.73:26 Substitution
Substitution Toni Brito Silva is brought on as a substitute for Adebayo Akinfenwa.73:26
The official flags Jack Midson offside.67:27 Substitution
Substitution Christian Jolley replaces Byron Harrison.66:37
Inswinging corner taken right-footed by Sammy Moore from the left by-line, Header from close range by Jason Euell clears the bar.
Gavin Hoyte restarts play with the free kick.62:12 Booking
Booking Clarke Carlisle is cautioned by the ref for unsporting behaviour.61:57
Free kick awarded for an unfair challenge on George Moncur by Clarke Carlisle.57:41
Corner taken by Kelvin Langmead, Jamie Stuart makes a clearance.57:06
Corner taken by Ben Harding.55:53
Close range shot by Rashid Yussuff goes over the bar.49:48
Inswinging corner taken by Sammy Moore from the left by-line, save by Chris Weale.49:27
Inswinging corner taken left-footed by Jason Euell, Kelvin Langmead manages to make a clearance.45:01
The referee starts the second half.45:00 +3:11 Half time
Half Time The first half comes to an end.45:00 +2:04
Corner taken by Ben Harding, Clarke Carlisle takes a shot. Jamie Stuart makes a clearance.45:00 +1:29
Corner from the left by-line taken by Michael Jacobs, Jamie Stuart makes a clearance.41:21
Shot from 18 yards by Michael Jacobs. Save by Seb Brown.37:49 Substitution
Substitution Rashid Yussuff on for Billy Knott.35:36
Adebayo Akinfenwa concedes a free kick for a foul on Sammy Moore. Direct free kick taken by Gareth Gwillim.25:51
Inswinging corner taken by Ben Harding from the right by-line, Kelvin Langmead has a headed effort from close range and clears the bar.24:58
Inswinging corner taken by Ben Harding, Jason Euell manages to make a clearance.23:31
Corner taken by Billy Knott from the right by-line, Adebayo Akinfenwa makes a clearance.18:10
Shot by Michael Jacobs. Save by Seb Brown.13:34
Unfair challenge on John Johnson by Jack Midson results in a free kick. John Johnson takes the direct free kick.9:40
John Johnson gives away a free kick for an unfair challenge on Jack Midson. Free kick taken by Billy Knott.1:16
Inswinging corner taken by Michael Jacobs from the left by-line, Headed effort from deep inside the penalty area by Adebayo Akinfenwa goes harmlessly over the crossbar.0:55
Effort on goal by Luke Guttridge from 20 yards. Save made by Seb Brown.0:00
The game kicks-off.
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