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Most states ask the Census Bureau to provide them with populatio <br />other political units and work with the Bureau for years before <br />boundaries included in the census geography. <br />What does that geography look like? First, you need to know the <br />geography: the statistical geography and the political geograph <br />2.Statistical <br />The statistical geography includes blocks, block groups, census <br />a.Block <br />A census block in an urban area is usually a city block, bounded <br />rural areas, where there may not be streets laid out in a grid p <br />and irregular, bounded by roads, railroads, rivers, lakes, and a <br />physical features, as well as by invisible city, town, or county <br />of a census block is about 100 people. <br />b.Block Group <br />A block group may have ten, twenty, thirty, or more blocks, all <br />their block number. Block groups tend to be relatively compact <br />c.Census Tract <br />Those blocks and block groups are aggregated into census tracts, <br />relatively compact and rectangular. They average about 4,000 pe <br />which tend to change significantly from one census to the next, <br />stable, in order to facilitate comparisons from one decade to th <br />d.County <br />The census tracts are aggregated by county. They do not cross c <br />3.Political <br />In addition to this statistical geography, the Census Bureau tab <br />counts by many kinds of political geography. Following is a part <br />used to build legislative and congressional districts. They all <br />states try not to have precinct boundaries that split a census b <br />I don’t know of any state that tries to avoid splitting block gr <br />10 <br /> <br />