The Seasiders opened the scoring after just three minutes. A tidy bit of play in the final third put the Cobblers under pressure, with the ball eventually finding its way to Zac Ashworth at the back post to finish past Ross Fitzsimons.
Ian Evatt’s side doubled their advantage from the penalty spot at the beginning of the second half.
After being brought down in the box, Ashley Fletcher stepped up to convert the penalty himself - and was able to send the goalkeeper the wrong way.
Joe Wormleighton had one of the better chances to register a goal for the visitors ahead of the hour mark, but was unable to keep his shot down in the box, while George Honeyman had a shot blocked down the other end, as Blackpool looked to extend their lead further.
There was also a golden opportunity for Kamarl Grant to mark his home debut with a goal, with the Millwall loanee smashing an attempt against the inside of the post.
Here’s how the Seasiders performed:
1. How did the Seasiders perform?
Blackpool took on Northampton Town at Bloomfield Road. Photo: Gareth Evans
2. Bailey Peacock-Farrell - 6
There was nothing too alarming for Bailey Peacock-Farrell to deal with, but needed better distribution in certain situations. Photo: Gareth Evans
3. Kamarl Grant - 7
Kamarl Grant gave another solid account of himself, in his first home appearance for the Seasiders. Photo: Gareth Evans
4. Michael Ihiekwe - 7
It was a solid return to action for Michael Ihiekwe - who was handed his first outing in over a month following a spell on the sidelines throughout injury. Photo: Gareth Evans
5. Olly Casey - 8
Olly Casey was on hand with an important header towards the end of the first half to keep Northampton out. Photo: Gareth Evans
6. CJ Hamilton - 7
CJ Hamilton was switched to the right wing-back role. Photo: Gareth Evans