Mr Ikpeazu polled 264,713 to defeat the candidate of the All Progressive Grand Alliance, Alex Otti, who polled 180,882 votes.
The result was declared in the early hours of Sunday after the supplementary election of Saturday.
Election was held in all the areas earlier listed by INEC for the re-run election except in Umunneochi Local Government Area.
INEC had erroneously scheduled election there, which was not supposed to take place in the first instance because the Form, EC40G, was not filled which indicated that there was no problem in the area.
