CensusCD 2000 Short Form provides details about the population of the United States. Short Form (SF1) is a 100 % count sample. It has variables including race, Hispanics, age of head of household, age of children, presence of older relatives, composition of the family, family size, rent vs. own, etc. It has 8 levels of geography: State, County, Tract, Block Group, MCD/CCD, Place, Congressional divisions and Zip (ZCTA).
Note that for block level information you need the separate 2000 Short Form Blocks product. Also, some geographies may not be linked within some hierarchies. For example, MCDs can't be grouped under counties but can be under states.
CensusCD 2000 Short Form is essential for two key pieces of information that are not available on the 2000 Long Form (SF3): Group Quarters and Country of Origin for Hispanics and for Asians. If you are interested in populations in specific types of group quarters (correctional facilities, nursing homes, student dorms, military barracks, etc.), then the SF1 is the only source of data. Likewise if you want the specific country of origin for Hispanics and Asians, you must consult the 2000 Short Form.
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CensusCD 2000/Short Form Blocks contains all Short Form data on the block level, thus providing very detailed information about the population of the United States. It has demographic information at the block level for each of the 8+ Million blocks from the most recent US 2000 Census.
The variables include race (and Hispanic designation), age of head of household, age of children, presence of older relatives, composition of the family, family size, rent vs. own, etc.
You can select various levels of geography: Nation, Region, Division, State, County, and Tract to view the data.
The data will be presented at the block level so there is no choice of SubAreas.
For example, you can look at the State of New York, at the block level for Age of Head of Household or you could look at Montgomery County (PA) or even just one of the census tracts in Montgomery County.
Note: This dataset is so large that it is divided among 4 regional CD's.