Which file is it? There seem to be a lot of options on that page.

Would there be a way to query wikipedia for the same type of information, or combine the two sources?

It's "NationalFile_20140601.zip - Download all national features in one .zip file "

I can't think of a way to query wikipedia - not like this allows. Once this file has been imported into sql (I use SQL Server), I run queries like SELECT DISTINCT [feature_type] FROM dbo.nationalFile WHERE [state] = 'California'

This will give me a list of all types of features in California. From there, I'll see something that looks interesting (like "lava field" or "mine") and I'll run another query like SELECT [feature_name], [latitude], [longitude] FROM dbo.nationalFile WHERE [state] = 'California' AND feature_type='lava field'.

This will give me a very clear list list. I can't imagine there would be a way to do this with Wikipedia, or any other online source that doesn't offer an API.

The structured data (such as geodata) in Wikipedia is being migrated to Wikidata, which does offer APIs:

https://www.wikidata.org/wiki/Wikidata:Main_Page

If you dig, I think you can find RDF dumps of the database.

@capnrefsmmat, wow! thanks! If this were 4chan, my reply would have been simply an image of Doc Brown exclaiming Great Scott. :-)