There was also a spike in online activity by voters at the weekend, with more than 50,000 registered voters using the elections.org.za website and app to check and update their address details.
Mamabolo said an estimated 300 000 voters who visited voting stations at the weekend were among the 2.8 million voters for whom the IEC did not have an address ahead of the voter registration weekend.
KwaZulu-Natal had the second highest number of new voters registering- 18.78%, which was less than Gauteng with 23.69% and more than Limpopo with 17.03%.
The website and app can be accessed 24 hours a day.
He said the registration forms containing the particulars of voters will be scanned and all demographic and address details will be captured over the coming weeks to determine the number of registrations that will reduce the shortfall of 2.8 million voters with incomplete residential address details.
Eastern Cape - 460 000 (16.63%).
He said these figures kept in line with past trends during registration weekends.
The Electoral Commission estimates that 24 per cent of black voters in the United Kingdom are not registered, as almost half of England gets set to go to the polls for local elections on 3 May 2018.
He again confirmed that Atul Gupta is a citizen of South Africa because he is on the country's voters' roll.
The commission is expected to facilitate over next year's elections on a date still to be determined.
The current term of Parliament ends in May next year and elections must be held within 90 days of the expiry of the term.