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<mods:title>TIGER/Line Census Tract Boundaries</mods:title>
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<mods:namePart>United States Census Bureau</mods:namePart>
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<mods:genre authority='lcgft' authorityURI='http://id.loc.gov/authorities/genreForms' displayLabel='specific' valueURI='http://id.loc.gov/authorities/genreForms/gf2011026297'>Geospatial data</mods:genre>
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<mods:genre authority='lcgft' authorityURI='http://id.loc.gov/authorities/genreForms' displayLabel='general' valueURI='http://id.loc.gov/authorities/genreForms/gf2018026119'>Data sets</mods:genre>
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<mods:digitalOrigin>born digital</mods:digitalOrigin>
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<mods:abstract>This dataset represents United States census tract GIS boundary files. Census tract boundary files are available for any location in the United States. The time coverage for census tract data is roughly between the year 1910 and present day. [This chart](https://nhgis.org/sites/www.nhgis.org/files/tract-availability.pdf) can help you find out if tracts are available by location for any given census year. Cartographers and digital mapmakers use census tract boundary files often. When making maps based on U.S. census data, it is necessary to match data to corresponding GIS boundary files. This makes it possible to display the data on a map. Census tracts are so popular because of how small they are; the smaller the unit, the more specific the study. You can read more about census tracts in the Census Bureau's [Reference Manual](https://www2.census.gov/geo/pdfs/reference/GARM/Ch10GARM.pdf).</mods:abstract>
<mods:note>Census data, while dating back to the 1790s, was collected in slightly different ways for every census year. This means that the way census geographies and demographic categories are available is subject to nuance, depending on which year you are looking for. NHGIS.org has this handy documentation that includes data availability tables for any given census year: https://nhgis.org/user-resources/data-availability</mods:note>
<mods:subject authority='lcsh' authorityURI='http://id.loc.gov/authorities/subjects'>
<mods:topic>Demographic surveys--United States</mods:topic>
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<mods:subject authority='lcsh' authorityURI='http://id.loc.gov/authorities/subjects'>
<mods:topic>Demographic surveys</mods:topic>
</mods:subject>
<mods:subject authority='lcsh' authorityURI='http://id.loc.gov/authorities/subjects'>
<mods:topic>Population statistics</mods:topic>
</mods:subject>
<mods:subject authority='lcsh' authorityURI='http://id.loc.gov/authorities/subjects'>
<mods:topic>Census</mods:topic>
</mods:subject>
<mods:subject authority='lcsh' authorityURI='http://id.loc.gov/authorities/subjects' valueURI='http://id.loc.gov/authorities/subjects/sh85104910'>
<mods:topic>Population</mods:topic>
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<mods:title>GIS Data Sets</mods:title>
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<mods:relatedItem displayLabel='Census Tract Boundary File Availability Chart by U.S. County (documentation)' xlink:href='https://nhgis.org/sites/www.nhgis.org/files/tract-availability.pdf' type='isReferencedBy'/>
<mods:relatedItem displayLabel='Data Availability: GIS Files (documentation)' xlink:href='https://www.nhgis.org/user-resources/data-availability#gis-files' type='isReferencedBy'/>
<mods:relatedItem displayLabel='Geographic Areas Reference Manual: Glossary (documentation)' xlink:href='https://www2.census.gov/geo/pdfs/reference/GARM/glosGARM.pdf' type='isReferencedBy'/>
<mods:relatedItem displayLabel='Geographic Areas Reference Manual: Census Tracts (documentation)' xlink:href='https://www2.census.gov/geo/pdfs/reference/GARM/Ch10GARM.pdf' type='isReferencedBy'/>
<mods:relatedItem displayLabel='NHGIS Data Finder Tutorial (tutorial)' xlink:href='https://www.youtube.com/watch?v=P1znKKm8vX4' type='isReferencedBy'/>
<mods:relatedItem displayLabel='Working with NHGIS and Joins (tutorial)' xlink:href='http://steppingintothemap.com/mappinghistory/wp-content/uploads/2018/03/Working-with-NHGIS-and-Joins.pdf' type='isReferencedBy'/>
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<mods:physicalLocation>Boston Public Library</mods:physicalLocation>
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<mods:accessCondition displayLabel='license' type='use and reproduction'>This work is in the public domain under a Creative Commons No Rights Reserved License (CC0).</mods:accessCondition>
<mods:accessCondition displayLabel='rights' type='use and reproduction'>No known copyright restrictions.</mods:accessCondition>
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<mods:recordContentSource>Boston Public Library</mods:recordContentSource>
<mods:recordCreationDate encoding='w3cdtf'>2025-02-11T17:11:38Z</mods:recordCreationDate>
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