Dear Ms. Kochenderfer,
Thank you for posting your request on History Hub!
The official records of voting returns for states, counties and precincts are maintained by the individual states. The location of these records may vary from state to state and by time period. We suggest contacting the state archives for each state. If the archives does not have this information, the staff should be able to refer you to the appropriate state agency.
We also searched online and located several unofficial websites with this information. Some of them also cite additional sources that may be useful.
We hope this information is helpful. Best of luck with your research!