Restricting searches on Careers does not appear to restrict to the requested geographic area like it used to. I have attempted to search for the city by name and ZIP code, as well as with and without keywords.
The keywords filter works fine, whether or not I provide a location.
These filters worked the last time I used the search feature on the site about a week ago.
Here are two screenshots showing my attempting searches:
In case it helps narrow it down, the XHR request for this search went to
http://careers.stackoverflow.com/jobs?searchTerm=react&location=80112&range=20&distanceUnits=Miles&ajax=1 which looks reasonable to me.