is castro valley an unincorporated area of alameda
This map shows the incorporated and unincorporated areas in Alameda County, California, highlighting Castro Valley in red. It was created with a custom script with US Census Bureau data and modified with Inkscape. Date: 23 July 2007: Source: My own work, based on public domain information. Based on similar map concepts by Ixnayonthetimmay: Author: Arkyan