More on Census Geography...When census tracts were first designated, boundaries were selected so that all the people within them would be relatively similar in terms of income, housing, and other characteristics. Since then, the boundaries have only changed slightly so that census tracts can be compared from one decade to the next. Changes in streets, highways and new buildings have caused some census tract boundaries to change slightly. Additionally, increases in populations lead to Census tracts being split up. Anyone comparing census tracts from the 1990 Census to the 2000 Census should be aware of any boundary changes. www.census.gov/geo/www/tiger/glossry2.pdf this is the link to the Census 2000 Geographic Terms and Concepts Here’s a link to a presentation that displays the different census geographic levels. |