Data that can only be found here:

Data that I’m hosting here as a backup because it’s important and I don’t trust it to stay where it is:
(go directly to the source if it’s still available)

Suggested external resources:

See also:
A guide to local transit and other geospatial data (blog, 2013)
Sunlight touches the pale flesh of CAGIS (blog, 2014)
All posts tagged “data” (blog)

Postscript:
If I promised anywhere on the blog or elsewhere that I would have some particular piece of data here and you don’t see it, I may have taken it down for a good reason. Or maybe not. I probably still know where it is though, so send me an email and I can probably get it to you.