The Great Register of Voters contains a variety of information about every registered voter in the county. The Archives holds the original handwritten volumes from 1890-1908. The information included varies over the years, but can include address, occupation, age, and a physical description of each voter. If the voter is a naturalized citizen, the date and place of their naturalization is also included. From 1910-1968, the Archives has the printed indexes to the Great Register, organized by precinct. These generally include less information about each voter. The Great Register is an important source for genealogists, or anyone seeking biographical information on local residents.
The Orange County Great Register of Voters from 1900 is available here.