New Census Tracts for 2010
Released: February 3, 2011
This map shows changes to the 2010 census tracts from the 2000 census tracts. The primary changes that are indicated here are where one census tract has been split into either two, three or four tracts (the majority into two tracts). Tracts are split when there is enough of a population increase within the tract to warrant dividing the tract into a smaller geographic unit, so this map on a simple level shows where there has been significant population increase since the last census was taken in 2000. This map indicates population growth in Alameda County, especially in Emeryville and Dublin.
Tracts are a basic unit of measurement from which we can look at and analyze all sorts of information, not just population. There are political, demographic, and economic data that can all be summarized by tracts and then used to better understand the state of these affairs in the past, present and trends for the future. With this information (and specifically by displaying this information on maps) we hopefully can make better decisions for our local community.
Census tract boundaries normally follow visible features, but may follow governmental unit boundaries and other non-visible features in some instances; they always nest within counties. Designed to be relatively homogeneous units with respect to population characteristics, economic status, and living conditions at the time of establishment, census tracts average about 4,000 inhabitants.