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Census 2010 Census Block GeoDemographics
information resources & solutions
What's New & Ahead
Visualizing census block patterns
... click links to view examples ...
- Santa Clara County, CA
- Jefferson County/Lakewood, CO
- Boise, ID
- Modesto, CA
- Honolulu, HI
- Shawnee Misson/Kansas City, KS
- New Orleans, LA
- Jefferson City, MO
- Omaha, NE
- Charlotte, NC
- McKinney ISD, TX
- Milwaukee, WI
- Portland, OR
- Columbus, OH
- Richmond, VA
- Cedar Rapids, IA
- Chicago, IL
Visual analysis with ProximityOne tools
click graphic for info; hover to pause
Census 2010 Census Block GeoDemographic resources include census block
shapefiles for mapping and geospatial analysis, census block demographic datasets
and shapefiles with integrated demographics. There are more than 11 million
Census 2010 census blocks covering the U.S. wall-to-wall. Census blocks are the smallest geographic areas
for which decennial census data are tabulated and are the smallest/lowest-level
building blocks for most other Census legal and statistical area geography.
Census 2010 Census Block Tallies by State
... interactive table: http://proximityone.com/geo_blocks.htm
... water and land area blocks; compare with tracts and block groups
... Warren Glimpse blog on this topic
... searchable list of blog posts
Looking at this geographic level allows you to examine custom-defined areas
(Washington DC example)
and visually convey insights to your team/clients.
Access/analyze these data using the
ProximityOne CV XE GIS or your own software.
Washington, DC; census blocks in context of OpenStreetMaps
See more views and related GIS/mapping details.
Census blocks are normally bounded by roads and rails where possible. Generally permanent from census to census,
census blocks are given a unique identifier comprised of state code(2) + county code(3) + tract code(6) + block code(4).
See examples in above view where census blocks are labeled with their GEOID/geocode.
Census Block Geographic & Demographic Resources -- scroll section
Census Block Application Areas -- scroll section
Census block data meet a wide range of reference, planning,
analysis, and data linkage needs. Selected topics are covered below.
Legislative Districts. While 2010 census blocks will generally retain the same code/ID and scope of geography until 2020
(there are some that have changed resulting from
post-Census 2010 census tract reorganization),
the initial Census 2010 Summary File 1 (SF1) tabulations reflected the 112th Congressional Districts (CDs) and corresponding
pre-redistricting state legislative districts (SLDs).
To equivalence Census 2010 census blocks to the 113th CDs and post-redistricted SLDs requires use of the 113th CD
SF1 released in 2013. The 113th SF1 geographic segment provides the required crosswalk codes.
Market Size/Composition. Use these maximum geographic granularity demographic
data to target your marketing, sales, operations, logistics, and related customer/market-oriented needs.
Schools & School Districts. By using census blocks (better yet block groups) to define school service areas or attendance zones
will make it easier to use Census 2010 and American Community Survey
(ACS) annual demographics to examine characteristics of those areas.
School districts are defined as a set of census blocks.
For districts that change boundary after the 2009-2010 school year (date for school district
boundary data in Census 2010 references), you can tabulate the size and characteristics
of the new district configuration and assess implication since changes from previous
boundaries -- by using census block geodemographics.
NTIA Broadband Initiative.
Census block level data are of critical importance to the U.S. National Telecommunications and Information Administration
(NTIA) broadband availability enhancement.
Only using the 2010 census block data can broadband providers accurately assess broadband
availability by urban/rural geography.
Civil Rights Issues. The single year of age detail, by gender, in the SF1
database provide an easily accessible database useful in wide ranging applications involving
civil rights cases. It becomes a relatively straightforward application to determine the
demographic size and composition of any study area.
Health. The Census 2010 data are used in many application areas as "denominator"
data. That is, by knowing the size of the population or housing served, health analysts
can better examine the implications of magnitude associate with health-related measures
that are often difficult to measure directly. Areas subject to analysis for health-related
reasons are sometimes defined in a fluid manner making the block level granularity ideal to develop
denominator data for health cachement areas.
Environment. The impact of pollutants along a stream or coastal area can often
be measured in terms of toxicity to the geographic area exposed. The census block data enable
analysts to examine the size of particular types of population adjacent to environmental
Disaster Planning. The SF1 data provide a unique way to be able to determine
the impact of any type of disaster with near pin-point accuracy -- and dynamically.
Urban & Rural. Each census block is classified as urban or rural.
The census block is the smallest urban area geographic area. Groups of urban blocks are used to
define urban clusters and urbanized areas.
The initial Census 2010 SF1 did not provide an urban-rural indicator at the block level.
Use the 2013 Census 2010 113th CD SF1 and
2013 TIGER/Line block shapefiles files to identify blocks as urban or rural.
Aggregate Block Data. Summary or aggregate data can be developed
for study areas based radii, corridors, or geographic correspondence of block
within an area. Aggregate the Census 2010 demographics contained in the data
record to your target geography. The data record contains the latitude-longitude as well as the full sequence
of geocodes to enable these types of data aggregation.
Geographic Relationships. Determine, for example, what ZIP code areas are partly/wholly
contained with a city, metropolitan area, county, custom study area, or many other
types of geography. Use the block correspondence list to enable your software to
aggregate non-census data to block or any of these other areas.
Equivalencing Census 2000 with Census 2010 Census Blocks
Census 2000 census blocks compared to Census 2010 census blocks often differ
in terms of geographic area covered and/or census block codes.
What was Census 2000 block 1007 in tract 4124.00 (aka 4124 aka 412400) in Harris County, Texas is subdivided into several blocks for Census 2010.
See these relationships by map view and tabularly in the
Census 2000 - Census 2010 Census Block Relationships Gallery views.
The Census 2000-Census 2010 census block equivalence file can be used to examine these differences.
Fields included in this file are listed in the following scroll section.
|ST00||2000 tabulation state FIPS code|
|CO00||2000 tabulation county FIPS code |
|TR00||2000 census tract number |
|BL00||2000 tabulation block number|
|BS00||2000 tabulation block suffix|
|LA00||2000 Land Area (in square meters) |
|WA00||2000 Water Area (in square meters) |
|BP00||2010 tabulation block part flag; Blank = whole; P = part |
|ST10||2010 tabulation state FIPS code |
|CO10||2010 tabulation county FIPS code |
|TR10||2010 census tract number |
|BL10||2010 tabulation block number |
|BS10||2010 tabulation block suffix |
|LA10||2010 Land Area (in square meters) |
|WA10||2010 Water Area (in square meters) |
|BP10||2010 tabulation block part flag; Blank = whole; P = part |
|LAINT||Intersection Land Area shared by the 2000 and 2010 blocks represented by the record (square meters) |
|WAINT||Intersection Water Area shared by the 2000 and 2010 blocks represented by the record (square meters) |
ProximityOne develops geographic-demographic-economic data and analytical tools and helps organizations knit together and use diverse data in a decision-making and analytical framework. We develop custom demographic/economic estimates and projections, develop geographic and geocoded address files, and assist with impact and geospatial analyses.
Wide-ranging organizations use our tools (software, data, methodologies) to analyze their own data integrated with other data.
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Contact ProximityOne (888-364-7656) with questions about data covered in this section or to discuss custom estimates, projections or analyses for your areas of interest.