Some history of tracts: https://www.census.gov/history/www/programs/geography/tracts_and_block_numbering_areas.html .

     Joel Kovarsky

On 9/10/2020 3:56 PM, James Nealis wrote:
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Christopher,

Jon Jablonski is correct - the whole U.S. was not divided into tracts then.  I don't believe any tracts existed for 1920. Only a handful of the larger cities were tracted in 30, but in 40 most big cities were divided into tracts.  In Colorado, only Denver had tracts in 40.  Most suburban areas were not given tracts at all, though parts of Los Angeles County outside the city were.  By 1950 the use of tracts finally began to grow.  In the earlier years the Census Bureau often used "Enumeration Districts" to break up populous areas.  I know the National Archives in College Park, Maryland, has copies of maps with those census enumeration districts - and many of them were scanned on-line.  You may want to contact them if such maps would be helpful to you.

Jim Nealis
University of Maryland McKeldin Library



-----Original Message-----
From: Christopher Thiry <[log in to unmask]>
To: [log in to unmask]
Sent: Thu, Sep 10, 2020 12:46 pm
Subject: Census mapping

All,

I would like to find a website where I can see the US Census by tract (not county) for the 1920, 30, 40, 50, .... Census.

The complicating part is seeing by tract, not county.

Many thanks in advance.

Christopher J.J. Thiry
Map & GIS Librarian
Academic Outreach Coordinator
Colorado School of Mines
Arthur Lakes Library
1400 Illinois
Golden, CO 80401
p. 303-273-3697
f. 303-273-3199