Captain Stephen Peters signs a new two-year deal with Northamptonshire after leading the club to promotion in 2013.
Durham will start the defence of their County Championship title with an away game against Northants on 13 April next year.
Northants all-rounder David Willey withdraws from the England Performance Programme squad with a back injury.
Newly-promoted Northants sign Australia Test seamer Jackson Bird as their overseas player for 2014.
Left-arm spinner Graeme White leaves Nottinghamshire to return to former county Northants on a two year deal.
Northants all-rounder David Willey joins Auckland Aces for New Zealand's domestic Twenty20 tournament this winter.
Northants batsmen Rob Keogh and Rob Newton sign new contracts with the promoted county.
Northamptonshire batsman David Sales signs a new one-year contract with the newly promoted Wantage Road side.
Seam bowler Maurice Chambers joins newly promoted Northamptonshire from Division Two side Essex on a two-year deal.
Northants offer David Sales a deal for 2014, but release Luke Evans, Christian Davis, Sam Sweeney and Con De Lange.
Australia bowler Trent Copeland is disappointed he will not be eligible to play for promoted Northants next season.
BBC commentators select and give the lowdown on county cricket's best XI of 2013
The Championship record of 18 lbw dismissals is equalled as Moeen Ali spins Worcestershire to win over Northants.
Chief executive David Smith says Northants became a "very different" club in its pursuit of promotion to Division One.
Northants win promotion to Division One of the County Championship after rivals Essex are bowled out by Hampshire.
Northants need two more points for promotion after bowling out Worcestershire for 163 on day one at New Road.
David Sales and James Middlebrook hit centuries as Northants draw with Kent to move closer to promotion.
Northants remain on course for promotion to Division One but their game with Kent heads for a draw.
Northants all-rounder David Willey signs a new three-year deal with the County Championship Division Two side.