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| | Research & Information Services - NCTCOG.org |
 | | These data are available by Census tract, zip code, city, county, and region, as well as in a radius summary from a given street address. |
 | | Census tracts (yellow lines) are small, relatively permanent statistical subdivisions of a county. |
 | | Census blocks (red lines) are areas bounded on all sides by visible features, such as streets, roads, streams, and railroad tracks, and by invisible boundaries, such as city, town, township, and county limits, property lines, and short, imaginary extensions of streets and roads. |
| www.nctcog.org /ris/census/index.asp (1080 words) |
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