Seamer Ben Sanderson signs a two-year contract extension with Northamptonshire, which expires at the end of 2022.
Eight of the nine Kingston brothers played for Northamptonshire in the 1890s and 1900s.
Northamptonshire batsman and former captain Alex Wakely signs a new contract until the end of the 2021 season.
Essex start their County Championship title defence with a home fixture against Yorkshire in a much-changed schedule in 2020.
Audio & Video
Gloucestershire and Northants players celebrate promotion to Division One of the County Championship after Glamorgan's draw with Durham sees both sides go up.
Analysis and opinion from the BBC's cricket correspondent.
How to follow the Ashes on the BBC
BBC Sport will bring you live radio, text and in-play highlights of the Ashes this summer.
Cricket alerts, newsletters and social media
Get latest scores and headlines sent straight to your phone, sign-up to our newsletter and learn where to find us on online.
Feeling the Draft? How to get into cricket
How to get into cricket - the thrill of the big hit, the rush of taking the catch, the skill of bowling. It's time to get into cricket.