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Census Basics

UP206A: Introduction to GIS. Census Basics. When was the first census? 1790 How many people were counted? 3.9 million How many states did we have then? 13 original states, plus the districts of Kentucky, Maine, Vermont, and the Southwest Territory What questions were asked?

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Census Basics

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  1. UP206A: Introduction to GIS Census Basics

  2. When was the first census? • 1790 • How many people were counted? • 3.9 million • How many states did we have then? • 13 original states, plus the districts of Kentucky, Maine, Vermont, and the Southwest Territory • What questions were asked? • name of head of family • number of persons in each household of the following descriptions: • Free White males 16 years and upward, • free White males under 16 years, • free White females, • all other free persons (by sex and color) and slaves History

  3. When was it taken? • April 1, 2000 • How many people were counted? • 281,421,906 (13.2 percent increase over the 248,709,873 in 1990) • Questionnaire included seven questions for each household: • name • sex • age • relationship • Hispanic origin • race • owner/renter Census 2000

  4. When was it taken? • April 1, 2010 • How many people were counted? • 308,745,538 (9.7 percent increase over the 281,421,906 in 2000) • Questionnaire included ten questions for each household: • http://2010.census.gov/2010census/about/interactive-form.php • Release schedule Census 2010

  5. Apportionment of representatives among the states • census determines how the 435 seats in the U.S. House of Representatives are divided among the 50 states Census 2010

  6. Census data directly affect how more than $300 billion per year in federal funding is allocated to local, state and tribal governments – $3 trillion over a decade. • draw legislative districts • evaluate success of programs or identify populations in need of services Why is the census important?

  7. Before 2010… Short and long…

  8. Short: how many?

  9. When was the long form introduced? • 1940 census • How many people got the long form? • 17 percent of the households (1 out of every 6 households) • What questions were asked? • ancestry • income • mortgage • size of the housing unit • disability • etc Long = how we live

  10. Meet the American Community Survey • The form • Replaces the long form • ie, [old long form] = [new American community survey] • From once in 10 years, to every year! (started in 2005) • 1, 3, and 5 year estimates • Which to choose? • http://www.census.gov/acs/www/guidance_for_data_users/estimates/ • You are in luck… the data is JUST becoming available, just in time for your final projects What? No more long form?

  11. counts and basic cross-tabulations of information collected from all people and housing units. • race, age, household size, owner/renter • Lowest level geography: • Blocks Summary File 1

  12. contains tables with social, economic and housing characteristics compiled from a sample of approximately 19 million housing units (about 1-in-6 households) that received the Census 2000 long-form questionnaire. Many tables are given for nine major race and Hispanic or Latino groups. • Lowest level geography: • Block Groups/Census Tracts Summary File 3

  13. UP206A: Introduction to GIS Census Geography

  14. Counties in 48 States • Independent Cities in 4 States • Parishes in Louisiana • Cities and Boroughs in Alaska • 58counties in California • 3,141 counties in the US Counties

  15. Incorporated Places (i.e. municipalities) • Census Designated Places (i.e. unincorporated areas) • 1,081 places in California • 25,150 places in the US Places

  16. Cover the nation (65,000 Census tracts across U.S.) • Relatively homogenous population characteristics • Size: optimally 4,000 people, range between 1,000 and 8,000 • 2,054 census tracts in Los Angeles County • 65,344 census tracts in the US Census Tracts

  17. Groups of blocks (share the same first digit) • Smallest areas for which sample data available • Size: optimally 1,500 people, but range between 300 to 3,000 • 6,351block groups in Los Angeles County • 208,689 block groups in the US Block Groups

  18. Smallest units of data tabulation • Cover the entire nation • Do not cross census tracts or counties • Generally bounded by visible features and legal boundaries • Size: average about 100people • 89,614 blocks in Los Angeles County • 8.2 million blocks in the US Blocks

  19. ZCTAs: ZIP Code Tabulation Areas • Approximate area representations of USPS ZIP Code service areas • Based on Census 2000 blocks • To address difficulties in mapping USPS ZIP Codes • May represent either a five or three-digit USPS ZIP Code • http://www.census.gov/geo/ZCTA/zcta.html ZCTA’s

  20. FIPS – Federal Information Processing Standards 06 037 701400 4 STATE COUNTY CENSUS TRACT BLOCK GROUP FIPS

  21. Topologically Integrated Geographic Encoding and Referencing • developed at the U.S. Census Bureau to support its mapping needs for the Decennial Census and other Bureau programs • coverage of the United States, Puerto Rico, the U.S. Virgin Islands, American Samoa, Guam, the Commonwealth of the Northern Mariana Islands, and the Midway Islands • http://www.census.gov/geo/www/tiger/ Tiger Files

  22. The larger the census geographic unit, the greater the amount of data available (i.e. Single years of data by County) • The smaller the census geographic unit, the less data available (i.e., Age in five-year categories for Census Tracts) Data and Census Geography

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