NationBuilder aims to support many types of election data and has created extensive infrastructure to support imports from CSV files.

Our documentation on importing custom voter files may help.

However, if you've got non-U.S. election data or specific municipal election info and other atypical data and questions about how to best use it in NationBuilder, let us know as early as possible and send us samples. We'll do our best to help you be successful in integrating the data important to your campaign.