The Archives holdings include local census records and indices, organized by county, for the following years:
- Territorial Census Records
- 1864
- 1866
- 1869
- 1874
- 1876
- 1882
- Territorial Census Index
- 1831 (Santa Cruz County only)
- 1862
- 1864
- 1866
- 1867
- 1870 Federal Census Index
- 1880 Federal Census Index