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The Census Bureau's Redistricting Data Products provide the states and other data users with the small area census data necessary for legislative redistricting. Among the geographic products disseminated for the 2010 Census are the Block Assignment Files (BAFs) and corresponding Name Look-up Tables (NLTs).
NLTs have been created for each of the 50 states, the District of Columbia, and Puerto Rico and work in conjunction with the BAFs. Every NLT contains the names and codes of every geographic area of the specific type within the state. If no records of the geographic area type exist within the state, the NLT will only display the field header.
The file naming convention is as follows:
where <ss> is the 2-character state FIPS code, <USPSabbrev> is the 2-letter U.S. Postal Service (USPS) state abbreviation, and <entity> is the geography area type being represented.
NLTs are pipe (|) delimited text (.txt) files. The first line of each NLT is the field header. The 10 types of NLTs and the fields they contain are described below:
|Geographic Area||<entity>||Field Layout|
|State legislative districts - upper||SLDU||STATEFP,DISTRICT,NAME,NAMELSAD|
|State legislative districts - lower||SLDL||STATEFP,DISTRICT,NAME,NAMELSAD|
|Elementary school districts||SDELM||STATEFP,DISTRICT,NAME,NAMELSAD|
|Secondary school districts||SDSEC||STATEFP,DISTRICT,NAME,NAMELSAD|
|Unified school districts||SDUNI||STATEFP,DISTRICT,NAME,NAMELSAD|
|Census designated places||CDP||STATEFP,PLACEFP,NAME,NAMELSAD|
|American Indian / Alaska Native / Native Hawaiian areas||AIANNH||STATEFP,AIANNHCE,NAME,NAMELSAD|
Field definitions are as follows: