The "long awaited" Federal Register notice dealing with the proposed
criteria for defining Tracts and Block Groups has been released. See
-------- Original Message --------
Subject: Publication of proposed criteria for tracts, block groups,
CDPs, and CCDs
Date: Fri, 6 Apr 2007 15:02:12 -0400
I am pleased to announce that the proposed criteria for census tracts,
block groups, CDPs, and CCDs was published today in the Federal
Register. Could you send a message to the CTPP folks and anyone else
you can think of in the transportation community announcing publication
of the notices? I am including text for your use in the message (see
below and also attached).
The Census Bureau has published proposed criteria for census tracts,
block groups, census designated places (CDPs), and census county
divisions (CCDs defined in 22 states as the statistical equivalents of
minor civil divisions) for the 2010 Census in the Federal Register on
April 6, 2007. All interested individuals and organizations are invited
to review and comment, as appropriate, on the proposed criteria for
these statistical areas. Each of the Federal Register notices is
available on the Census Bureau's Participant Statistical Areas Program
as well as via
the Federal Register's website at http://www.gpoacess.gov/fr/index.html
General information about the 2010 Participant Statistical Areas Program
is available on the Census Bureau's website at
Requests for additional information about these statistical areas as
well as copies of the proposed criteria Federal Register notices should
be directed to Michael Ratcliffe, Chief, Geographic Standards and
Criteria Branch, Geography Division, U.S. Census Bureau, via e-mail at
geo.psap.list(a)census.gov or telephone at 301-763-3056.
Comments on the proposed criteria for these statistical areas should be
provided in writing to the Director, U.S. Census Bureau, Room 8H001,
Mail Stop 0100, Washington, DC 20233-0001. Written comments must be
submitted on or before July 5, 2007.
In summary, the proposed changes to the criteria for census tracts,
block groups, CDPs, and CCDs are:
-Lower the minimum population threshold for most tracts to 1,200.
-Housing units counts may be used in addition to meet tract thresholds.
-All types of populated tracts should meet the same thresholds.
-Wherever possible census tracts should conform to American Indian
-Special tracts may be created for large special land use areas without
housing units or population.
-Increase the minimum population threshold to 1,200.
-Housing units counts may be used to meet block group thresholds.
-All types of populated block groups must meet the same threshold.
-Wherever possible block groups should conform to American Indian
-Special BGs may be created for large special land use areas without
housing units or population.
-A CDP cannot have zero population and zero housing units.
-A CDP cannot be coextensive with a governmentally active minor civil
division (i.e., town, township, charter township, plantation). This
change will reduce redundancy in place and county subdivision data
tabulations for the following states: Connecticut, Maine,
Massachusetts, Michigan, Minnesota, New Hampshire, New Jersey, New York,
Pennsylvania, Rhode Island,
Vermont, and Wisconsin.
-A CDP must represent a single, distinct community. A CDP that
represents multiple, distinct communities, and the hyphenated name
typically assigned to represent such CDPs, will not be permitted.
Exceptions will be made for communities whose identities have merged and
which both names commonly are used together.
-The Census Bureau is questioning whether to retain or eliminate CCDs
as geographic entities. If eliminated, CCDs would not be replaced by
other sub-county geographic entities.