Searcher locality is starting to influence regular search results for almost every query. Because this location is auto-detected you can’t omit it from a search. You can only change is to another location within your country.
Even very generic searches are influenced in extreme ways. That is why local links are getting more important, also for your important keywords.
The example below shows how a very generic search for “www” (which I use to get generic authorities from Google) returns “dortmund” specific authorities first, just because my proxy is located there.