Leading goalscorer Adebayo Akinfenwa is one of seven players who will not be offered extensions to their current contracts at the Cobblers.
Akinfenwa, who scored 17 goals for the club during the 2012-13 season, will not be retained at Sixfields alongside six other players.
Fellow strikers Jake Robinson, Lewis Wilson and Louis Moult will also be leaving, as will midfielder Paul Turnbull, who spent the second half of the season on loan at Lincoln City, and defender Nana, who has missed more than a year of action with a knee injury but is understood to be close to securing a move to Yeovil Town.
Manager Aidy Boothroyd has offered new contracts to six out-of-contract players, with captain Kelvin Langmead already agreeing terms on a two-year extension.
In addition to skipper Langmead, Lee Collins, Luke Guttridge, Ben Tozer, Ben Harding and Roy O’Donovan have all been offered new deals, while a contract has also been offered to Nathan Cameron, the central defender who was on loan from Coventry City but has since been released by the Sky Blues.
“We would like to place on record our sincere thanks to all of the departing players for their efforts and wish them well in the future careers,” said a club statement.
Offered terms: Cameron, Collins, Guttridge, Tozer, Harding, O’Donovan
Released: Johnson, Robinson, Akinfenwa, Nana, Wilson, Moult, Turnbull