A by-election was held:[22] Independent Cllr Paul Woodruff (Halton-with-Aughton) resigned in July 2017.
[23] A by-election was held:[24] Labour Cllr Roger Sherlock (Skerton West) died in November 2017.
[25] A by-election was held:[26] University and Scotforth Rural ward Labour councillors Sam Armstrong (elected Green) and Lucy Atkinson retired in March 2018.
[26] Conservative councillor Michael Smith (Overton), who is partially deaf resigned in November 2019 because he was "struggling to hear" in meetings.
[28] A by-election was held the next month, on the same day as the 2019 United Kingdom general election.