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Subject Matter Overview. For each type of geographic area, population estimates and projections are provided for these subject matter categories: • General Demographics • Social Characteristics • Economic Characteristics • Housing Characteristics Not all items are available for all types of geography. Estimates and Projections Geography. In addition to U.S. summary and states, estimates and projections are produced for the following types of geography (click on link to view definition). • U.S., States, D.C. • Metropolitan Areas • Counties and County Equivalent Areas • School Districts • ZIP Code Areas • Census Tracts • Incorporated Places/Cities • Minor Civil Divisions Methodology. The methodology makes use of an integrated geographic area estimation and projection modeling system. Resulting estimates and projections are consistent across all types of geography. Individual housing unit; bottom up aggregation. Data by individual housing unit/address are associated with corresponding census block. Summary statistics are tabulated for 8.2 million blocks that are then rolled-up and aggregated to higher level geography. Dynamics of local/regional economy. The impact of establishment (businesses, government facilities, etc.) expansion and contraction are modeled in the regional economy enabling improved measures of migration. Age-cohort progression. In a parallel operation, the 'demographic core' items (age, race/ethnicity, gender) are estimated/projected using a age-cohort progression method and associated time series models. Controls to official estimates. The historical data are consistent, down to the individual age cell, with the official Census Bureau post-Census 2000 estimates. This fact not only assures users that they are using data that will agree with published official data, but also that the best means of producing the historical data reflected both in the historical data and the projections. The historical data series have also been reviewed by state participants in the Census Bureau Federal State Cooperative Program for Population Estimates. Unlike estimates produced by other independent means, the historical series benefit from the scrutiny and local knowledge available from specialists in their respective states. More detail on the methodology is available upon request (use form also located on this Web page). Additional Information and Ordering. Demographic estimates and projections may be purchased in various media to meet specific geographic requirements by check or credit card. You may also complete this form for additional information. Specify the type and scope (e.g., as state) of geography in the text box. Please complete all fields. None of this information is shared with anyone. | |||||||||
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