Click here to download LGA election results at the ward level for March 1997. These elections took place during the rule of dictator Sani Abacha. As far as I know, this is the only known copy of this data. Note: this is a large (37 megabyte) file.
Click here to download the results of the 1998 local government elections. The results are broken down by party and aggregated to the state level. But they also include turnout data. These elections were important because as part of the transition plan, parties had to generate votes at the local government level in order to qualify for the subsequent national-level elections.
Please cite carllevan.com/data/