Datasets - CivicData.com

Sacramento Region Census Data
- 2010 county subdivisions with GEOIDCSV
  This file contains names, identifiers, and brief statistics for 38 county...
  
  View Dataset
- county subdivisions - original 2010 US Census ...
  This is what the original census file looked like before extra information...
  
  View Dataset

You can also access this registry using the API (see API Docs).