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1 U.S. Census Bureau Data Availability for Geographic Areas March 25, 2008.

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Presentation on theme: "1 U.S. Census Bureau Data Availability for Geographic Areas March 25, 2008."— Presentation transcript:

1 1 U.S. Census Bureau Data Availability for Geographic Areas March 25, 2008

2 2 Hierarchy U.S. Regions and Divisions State County County Subdivision Place (or place part) Census tract Block group Block

3 3 Census Regions and Divisions

4 4 Three factors usually affect the search for data from the Census Bureau: 1. topic (e.g., population) 2. geography (e.g., my state) 3. time period (e.g., most recent year).. Search for Data

5 5 Generally the larger the geographic area, the more topics and time periods you can find. U.S. level – Extensive data States and Counties - Substantial data Cities (i.e., incorporated places) – Somewhat less data Small areas (census tracts, block groups, and blocks) - once a decade after the Census Bureau tabulates the results of the Population and Housing Census. In 2010 - the American Community Survey will allow the Census Bureau to release data more frequently for areas as small as census tracts. Data Availability

6 6 Examples of Data by Small Geography Census 2000 Summary File 1 (100%) Census Tract Blocks - most tabulations Summary File 2 (100%) Census Tract Summary File 3 (Sample) Census Tract Block Group - most tabulations Summary File 4 (Sample) Census Tract

7 7 Examples of Data by Small Geography Economic Census - 2002 Zipcode level American Community Survey – 2006 Areas of 65,000+ population

8 8 PUMS and PUMAs

9 9 Public Use Microdata Sample Microdata allow users to prepare their own customized tabulations of most population and housing subjects using specially prepared microdata files. These files are the actual responses to census questionnaires, but with names or addresses removed and the geography sufficiently broad to protect confidentiality.

10 10 What is a PUMA ? Public Use Microdata Area PUMA is a geographic entity for which extracts of the full range of population and housing data collected from a small sample of confidentiality-screened census records are provided. PUMAs are sub-state areas that can be composed of: A large single county or groups of counties Large places Groups of census tracts Combination of tract and county and Other variations

11 11 PUMA Delineation The Census Bureau offered State Data Centers (SDCs) the opportunity to delineate, or coordinate the delineation of, the super-PUMAs and the PUMAs. The SDCs (or their equivalents) in 48 states, the District of Columbia, and Puerto Rico participated in the delineation program. PUMA codes must be used in conjunction with the 2-digit FIPS state codes. PUMAs: Minimum population of 100,000 - cannot cross a state line. (5% long-form records sample) Super PUMAs: Aggregated PUMAs with a minimum population of 400,000 - cannot cross state lines. (1% long-form records sample)

12 12 Public Use Microdata Areas

13 13 Large Single County - PUMA 00100 Multiple Counties PUMAs 00500 00200

14 14 Large City PUMA 00700 Census Tract Groups PUMAs 00802 00803

15 15 Putnam County + One census tract in Westchester County

16 16 Data by PUMAs Available Decennial Census American Community Survey

17 17

18 18 Mapping Online Maps available on Static Interactive Thematic Reference

19 19

20 20 Census 2000 Census Tract Map Zoom Pan Select Search

21 21

22 22 Static Map Reference Map Theme Map

23 23

24 24 Theme Map County Business Patterns

25 25

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27 27 Interactive Census Tract Reference Map Change Boundaries Pan Zoom in Zoom out Print Download

28 28 Static Reference Map Print Download

29 29 Reference Map Use Map to Select a Neighborhood Data table is selected Show Result

30 30 New York Regional Census Center 330 W. 34 th Street – 13 th floor NY, NY 10001 646-233-2404

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