Voter Registration Records and List Maintenance for Federal Elections [October 21, 2021] [open pdf - 1MB]
From the Summary: "Each state except North Dakota requires voter registration as a prerequisite for voting in federal elections. The accuracy of voter registration records is often considered important for election administration, as these records are typically used to create 'poll books' (lists of eligible voters) or otherwise assess the eligibility of individuals to cast a ballot in an election. This information can help election officials with other administrative purposes, such as preparing sufficient election materials or appropriately distributing resources (such as poll workers, ballots, and equipment) across voting sites within a jurisdiction. The data contained in voter registration records also enable election officials to contact prospective voters with relevant election information, such as updates or notifications about election dates, polling place locations, or methods of casting a ballot."
CRS Report for Congress, R46943
Congressional Research Service: https://crsreports.congress.gov/