The electoral commission has taken 1,609,553 invalid entries off the preliminary voter register.
INEC Chairman Joash Amupitan announced this at a press conference in Abuja on Monday.
Most of the removals, 1,608,660, were invalid registrations from the 2025/2026 Continuous Voter Registration.
Another 873 were verified deaths.
The removals came after complaints from the public during the ward level display of the register from 9 to 15 October, as well as checks after online publication.
The biometric system flagged 1,545,052 of them for review.
INEC said some registration staff deliberately got around the rules, including misusing provisions meant for persons with disabilities.
In total, 54 people across 10 states have been named as complicit, and they face disciplinary action and possible prosecution.
Amupitan also said the problem goes beyond the latest registration drive.
He said people who moved and re-registered in a new area, instead of transferring their details, may still be listed in their old polling units.
He advised them to check there.
The commission has also postponed the nationwide biometric revalidation exercise until after the 2027 elections, following concerns about timing.