Note: For source and production information, see the What MassGIS Provides section on the main MassGIS Census 2000 Web page.
 

ATTRIBUTES

The polygon attributes (census2000tracts_poly.dbf and census2000tracts_poly_orig.dbf) for the Census 2000 Tracts shapefiles distributed by MassGIS contain the following items:
 

ITEM NAME		TYPE / WIDTH		DESCRIPTION
AREA		N / 16		Area of polygon(s) in square meters.
PERIMETER		N / 16		Perimeter of polygon(s) in meters.
STATE		C / 2		State ID Code. (Massachusetts = 25)
COUNTY		C / 3		County code (FIPS-ID without“25”)
TRACT		C / 6		Census 2000 Tract Code
CT_ID		C / 20		Unique Blockgroup ID value
LOGRECNO		C / 7		Common field to join/link to related attribute tables
BLK_COUNT		N / 3		Number of blocks in the census tract
TOTAL_POP		N / 10		100% Count of Population (from SF1)
SAMP_POP		N / 10		Sampled Count of Population (from SF3)
DRY_PCT		N / 8		Percentage of non-water area for the block
DRY_ACRES		N / 12		Non-water area, in Acres
DRY_SQMI		N / 10		Non-water area, in Square Miles
DRY_SQKM		N / 10		Non-water area, in Square Kilometers
** - For the most accurate display of population density by Census Tract, normalize TOTAL_POP by any of the last three items.

Note: The 100% population counts and the sampled population counts for any given census tract will often have different values. This is due to the nature of sampling and extrapolation techniques in statistics. It is recommended that when using SF1-derived data, the 100% population count be used, whereas when SF3-derived data is used, the sampled population should be utilized instead in order to maintain consistency between the headcount and the tabular values.

The following tables, available in dBase format (.dbf), which provide detailed demographics information, may be joined to the Census Tracts shapefiles on the LOGRECNO item. See the Field Descriptions page or see ct_fields.xls (Excel format) and ct_fields.dbf (dBase format).
 

Download All Tables (plus field description table, in a self-extracting Windows executable file; 883 KB) or click the Download link after each table description to download that table in a self-extracting Windows executable file

ancestry_and_foreign_place_of_birth.dbf
Lists number of individuals with specific ancestry types and number of foreign-born individuals from specific regions. Download

households_by_owner_renter_income.dbf
Lists number of households that fall within a certain income threshold, distinguished by owner vs. renter status. Also lists median income values. Download

households_by_partner_type.dbf
Number of households distinguished by marital status, gender of primary householder, and gender of primary householder's partner. Download

language_spoken_by_age.dbf
Number of individuals speaking a very specific language, broken down by child vs. adult age groups. Download

median_incomes_by_family_type.dbf
Median incomes for families, with specific values for married couples and presence/non-presence of children. Download

mental_physical_disabled_pop_by_age.dbf
Listing of all individuals age 5 and over with physical or mental disabilities, broken down by gender, age grouping, and employment status. Download

population_by_habitation_tenure_ownership.dbf
Population counts for year of entry into present housing unit, distinguished by owner vs. renter status. Download
 

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• OVERVIEW
• WHAT MASSGIS PROVIDES
• Census 2000 Blocks
• Census 2000 Block Groups
• Census 2000 Tracts
• Census 2000 TIGER Linework
• Census 2000 TIGER Water Bodies
• Census 2000 TIGER Towns
• Environmental Justice Populations
• CONSIDERATIONS WHEN USING TIGER DATA
• OTHER RESOURCES

 

Last Updated 7/31/2003
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