Cambridge: Trumpington ward, after the resignation of Liberal Democrat councillor Peter Lord. His term was due to end in May next year so no byelection will be held.
South Cambridgeshire: Harston and Comberton ward, after the resignation of Liberal Democrat councillor Philip Allen; he has also left the party over its failure to support rejoining the European Union. Term ends 2022.
Test Valley: Chilworth, Nursling and Rownhams ward, after the death of Conservative councillor Alison Finlay. Term ends 2023.
Wirral: West Kirby and Thurstaston ward, after the death of Conservative councillor and former Mayor Geoffrey Watt. He will not be replaced in a byelection as his term was extended to May next year.
Dates for byelections
In England, all current vacancies which do not fill a term ending in 2021 will be held on 6 May 2021, the ordinary day for local elections. The Cabinet Office has confirmed that local elections teams should not plan on this date being brought forward. In Wales, all byelections will be held in a period between 1 February and 16 April 2021.