More than 100,000 people have applied to register to vote in the past 48 hours, according to Government figures.
A total of 52,408 applications were submitted on Monday, followed by 64,485 on Tuesday.
In both cases this is well above the typical number for weekday applications, which has been averaging around 27,000 for the past month.
The jump suggests growing public expectation of a general election.
More than half (58%) of applications submitted in the past two days were from people aged 34 and under, while just 8% came from those aged 65 and over.
If a snap general election were to take place on October 15, the deadline for applying to register to vote would be September 27.
Full details on how to register are at gov.uk/register-to-vote