Is data on car-free households available?
http://www.bikesatwork.com/carfree/carfree-census-database.html suggests that the 2000 census included data on car-free households (also, worth reaching out to them to help plug their searches into Census Reporter!)
I'd love to find that data here but all I see is "means of transportation to work"
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Oh, note that the "collapsed" (C...) tables are only available for ACS 1- and 3-year releases, so you won't be able to get those specific columns for smaller areas.
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Sorry for the slow response. We're still getting our head around the UserVoice system.
There are a number of tables which count vehicles available, by household as well as by workers and by housing units. Here's a summary. Maybe we can call this out specifically on the "commute" topic help page.
B08014/C08014: Sex of Workers by Vehicles Available
http://censusreporter.org/tables/B08014
http://censusreporter.org/tables/C08014B08141/C08141: Means of Transportation to Work by Vehicles Available
http://censusreporter.org/tables/B08141
http://censusreporter.org/tables/C08141B08201/C08201: Household Size by Vehicles Available
http://censusreporter.org/tables/B08201
http://censusreporter.org/tables/C08201B08203/C08203: Number of Workers in Household by Vehicles Available
http://censusreporter.org/tables/B08203
http://censusreporter.org/tables/C08203B08541/C08541: Means of Transportation to Work by Vehicles Available for Workplace Geography
http://censusreporter.org/tables/B08541
http://censusreporter.org/tables/C08541B25044: Tenure by Vehicles Available
http://censusreporter.org/tables/B25044B25045/C25045: Tenure by Vehicles Available by Age of Householder
http://censusreporter.org/tables/B25045
http://censusreporter.org/tables/C25045B25046: Aggregate Number of Vehicles Available by Tenure
http://censusreporter.org/tables/B25046