The first round of matches began on 5 April and the final round of matches ended on 26 September.
[2] At the end of the 2019 season only one team was relegated with three promoted.
[a] Source:[4] Team promoted from Division Two in 2018 Team relegated from Division One in 2018 Fixtures for the 2019 County Championship were announced on 26 November 2018, with the previous season's champions Surrey beginning the defence of their title against Essex at The Oval.
[5] Teams receive 16 points for a win, 8 for a tie and 5 for a draw.
Sources: BBC Sport,[13] ESPNcricinfo,[14] ECB[10]