Stockport 0-1 Tamworth
Tamworth moved above Stockport as Adam Cunnington's first-half penalty was enough for victory at Edgeley Park.
The Lambs took the lead when Matty Mainwaring fouled Jonathon Thorpe in the area and Cunnington scored from the spot for his 16th goal of the season.
County responded well and Lambs goalkeeper Tony Breedon made a number of crucial saves in the first half.
The Hatters pressed again after the break but Tamworth held on to stretch their unbeaten run to four games.