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What are some sources for open data on cities?
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US Census Historical Data
May 23, 2013 Leong D
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The National Historical GIS

This is not strictly an urban dataset, but it's very useful for searching data for census tracts in cities over time. Niftily, they provide shapefiles that reflect the differences in census tract boundaries between different censuses. Very useful for detecting urban historical trends!

More Info:
https://www.nhgis.org/

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