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Census Geography (Legal Entities). Nation State Counties Minor Civil Divisions Boroughs, Townships Place Towns, Cities, Villages. Census Geography (Stat. Entities). Blocks Small areas bounded by physical features Block Groups Collections of Blocks A Census Tract Subdivision
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Census Geography (Legal Entities) • Nation • State • Counties • Minor Civil Divisions • Boroughs, Townships • Place • Towns, Cities, Villages
Census Geography (Stat. Entities) • Blocks • Small areas bounded by physical features • Block Groups • Collections of Blocks • A Census Tract Subdivision • Census Tracts • As Homogeneous As Possible • Roughly 1,000 – 8,000 persons
Census Geography (Stat. Entities) • Census-Designated Places • Urbanized Areas • At least 50,000 population • Density of 1,000/sq.mi. at core • Density of >= 500/sq.mi. at periphery of core • Urban Cluster • Consists of the density requirement of UA
Census Geography (Stat. Entities) • Metropolitan Areas • Large population nucleus • High degree of integration at nucleus • Social • Economic • Functional • Boundary theoretically defined by spatial extent of integration
Census Geography (Stat. Entities) • MA • Freestanding MSA not closely aligned with another MA • PMSA • An MA with > 1,000,000 population that is subdivided into contiguous MAs • CMSA • A specific collection of PMSAs
Census Sampling Patterns • Short Form • As near “census” as possible • SF1, SF2 & Redistricting Summary File • Long Form • 1 in 6 receive survey • Constitutes the 1% and 5% samples • SF3, SF4 & PUMS (among others)
Short Form Census • Only Seven Questions • Fulfills the Constitutional Obligation • Decennial Enumeration of Population • Congressional Representation
Short Form Questions • Name • Sex • Age • Relationship • Hispanic Origin • Race • Tenure (owner or renter)
Demographic Oddities • Shifting definition of “hispanic” over time • 2000 Census first to consider multi-racial categories
Long Form Questions • Moving away from original intent of decennial census • Questions much more probing and sensitive • Purpose? • Qualifying for federal funding & grant programs
Data Files Consist of Tables • Population (P) • Housing (H) • Population at Census Tract level (PCT) • Tables are indicated by prefix and a number
Example • P12 • Sex by Age (5-year groupings)