Voters in London face 10 council by-elections after councillors elected last month step down.
Nine of these contests were triggered by councillors who were only elected last month.
Analysis by the PA news agency revealed that London accounts for nine of the 14 by-elections being held nationwide.
These elections aim to replace councillors elected on May 7.
The resignations have led to upcoming by-elections in Hackney, Lewisham, Camden, Haringey, Ealing, and Lambeth.
Among those stepping down are Green politicians Zoe Garbett and Liam Shrivastava.
They resigned their council seats after being elected mayors of Hackney and Lewisham, respectively.
According to electoral law, councillors are not allowed to hold both positions.
Three newly elected Green councillors in Camden, Hackney, and Haringey also stepped down after it emerged they were ineligible to serve.
This included two who worked as teachers.
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The law prevents people employed by a council, like teachers at schools maintained by that authority, from serving as councillors for the same local authority.
Elsewhere, Green councillors elected in Ealing and Lambeth resigned due to ill health, while a newly elected Labour councillor in Haringey stepped down for personal reasons.
Another Lambeth Green, Saiqa Ali, did not take up her seat after being suspended by the party before polling day over social media posts.
The London by-elections scheduled between June 18 and July 9 are:
- Hillingdon West (Hillingdon) – June 18
- Crofton Park (Lewisham) – June 18
- North Acton (Ealing) – June 25
- Dalston (Hackney) – June 25
- Hackney Central (Hackney) – June 25
- Northumberland Park (Haringey) – June 25
- Woodside (Haringey) – June 25
- Regent's Park (Camden) – July 9
- Clapham Park (Lambeth) – July 9
- Streatham St Leonard's (Lambeth) – July 9
The Association of Electoral Administrators suggested that greater awareness of candidate eligibility rules could help reduce avoidable by-elections.
Peter Stanyon, the organisation's chief executive, said: "We've raised our concerns with UK, Scottish and Welsh ministers about ineligible candidates standing, and others who resign shortly after election for a range of reasons.
"Greater clarity and awareness would help reduce avoidable by-elections, the costs of which are borne by local authorities – so ultimately taxpayers."
The cost of running a by-election is typically between £20,000 and £30,000 for local authorities.
Based on the lower estimate, the 14 by-elections triggered by councillors elected on May 7 and subsequently stepping down could cost councils around £280,000.
The costs of avoidable by-elections are ultimately borne by taxpayers.
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