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1
U.S. Census Bureau
Data Availability for Geographic Areas
March 25, 2008
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HierarchyU.S.
Regions and Divisions
State
County
County Subdivision
Place (or place part)
Census tract
Block group
Block
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Census Regions and Divisions
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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
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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
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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
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Examples of Data by Small Geography
Economic Census - 2002• Zipcode level
American Community Survey – 2006• Areas of 65,000+ population
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PUMS
and
PUMAs
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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.
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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
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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)
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Public Use Microdata Areas
500
100
600
400
200
300
00100
01000
01100
01300
00900
01800
02200
01200
00200
02100
01400
02300
00400
00700
01600
00500
01500
02300
01700
02500
00600
00300
01900
02000
02400
00800
FAIRFIELD
HARTFORD
NEW LONDON
MIDDLESEX
LITCHFIELD
NEW HAVEN
TOLLANDWINDHAM
1% Public Use Microdata Area (PUMA)
5% Public Use Microdata Area (PUMA)
County Boundary
Sea
COUNTY NAME
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Large Single County - PUMA 00100
Multiple
Counties
PUMAs
00500
00200
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Large City PUMA 00700
Census
Tract
GroupsPUMAs
00802
00803
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Putnam County
+
One census tract in Westchester
County
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Data by PUMAs
Available
Decennial Census
American Community Survey
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Mapping Online
Maps available on www.census.gov
Static
Interactive
Thematic
Reference
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Census 2000 Census Tract Map
Zoom
Pan
Select
Search
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Static Map
Reference Map
Theme Map
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Theme Map
County Business Patterns
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Interactive Census Tract
Reference MapChange Boundaries
Pan
Zoom in
Zoom out
Download
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Static Reference Map
Download
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Reference Map
Use Map to Select a Neighborhood
Data table is selected
Show Result
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New York Regional Census Center
330 W. 34th Street – 13th floor
NY, NY 10001
646-233-2404
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