| Geography |
Geocomp |
Sumlev |
Description* |
| Block |
NA |
NA |
Census
2000 blocks. Census blocks
are the smallest units of data tabulation.
They cover the entire nation and
do not cross census tracts or counties.
They are generally bounded by visible
features and legal boundaries. Their
average size is about 100 people.
Note 1:Block level data is not
currently available in SF3 data.
Note 2: Block numbers completely
different from 1990.
|
| Blockgroup |
00 |
150 |
Census
2000 blockgroups. Blockgroups are
groups of blocks sharing the same
first digit. It is the smallest area
for which sample data available. Blockgroups
have an optimal size of 1,500 people
but can range between 300 to 3,000.
Note: Blockgroups are only
available for housing (H) tables and
population (P) tables. |
Congressional
District |
00 |
500 |
Congressional
Districts as designated for the
106th Congress. |
Parish
(County) |
00 |
050 |
Parishes
as of January 2000. (In Louisiana,
counties are called parishes.) |
| Tract |
00 |
140 |
Census
2000 tracts. For the first time for
Census 2000, tracts cover the nation.
Tracts have relatively homogenous
population characteristics. Tracts
have an optimal size of 4,000 people
but can range between 1,000 and 8,000.
|
Zip
Code Tabulation Area
(3 digit) |
00 |
851 |
Zip code tabulations areas (ZCTAs)
are approximate area representations
of USPS ZIP Code. They are based on
Census 2000 blocks and were created
to address difficulties in mapping
USPS ZIP Codes. ZCTAs can represent
3 digit zip codes (ie, zipcodes with
the same first 3 digits) or 5 digit
zip codes. |
Zip
Code Tabulation Area
(5 digit) |
00 |
871 |
