I am trying to compile a list data sources - excluding the US Census - that cover the continental US at the state, county and ZIP/ZCTA level. Any help would be appreciated.
Additional details: I have created an R package that facilitates creating choropleth maps of arbitrary data. As an example, I have built in support for mapping data from the US Census' American Community Survey (ACS).
The feature that I am working on now is facilitating mashups / normalization of user-supplied data sets with census data. This will be very useful for my company (and I suspect any organization which generates data with a geographical component) because we constantly generate data which we aggregate at a geograpic level. For example, Los Angeles County will always have a lot of whatever you are measuring because it is the most populous county. But if you normalize that data on a per-capita basis Los Angeles might actually appear low. That's the sort of insights that I hope to facilitate.
The problem I'm having is creating examples of this feature which I can share with an audience outside my company. I obviously cannot share our internal sales data, and I am having trouble finding data sources outside the US Census that are
- Are trustworthy
- Would be interesting to make choropleths of at the state, county and zip level
- Would be interesting to then choropleth-ize as a mashup of ACS data (e.g. make per capita)
- Provide easy access to their data.
Any help would be appreciated.