Almost every newspaper has a definite editorial stance, well-known if not expressly proclaimed. (Whether that bleeds out of the editorials page into the news coverage is a more controversial question.) Is there such thing as a reasonably objective reference source or website that can tell me politics of a given newspaper?
Nobody knows?
Nobody?
Honestly, no. While “everybody knows that the River City Times-Recorder is moderate conservative,” I know of no source that lists this sort of material off for most major papers.
I don’t believe an objective listing of newspaper’s political stances is possible. The compiler of the list would also have his/her/their own biases and that would means you would be getting a subjective decision on something that is already subjective.
That doesn’t mean it’s impossible. The relative editorial stances of any two papers are probably noncontroversial. Take the Wall Street Journal as a starting point: Everybody agrees, and the editors would not deny, that its editorial (page) policy is conservative, specifically business-conservative. So, what papers are to the right and to the left of it? (Or perhaps we need a multi-axis map.)
A multi-axis map at the very least!
As well as simple left/right, authoritarian/libertarian stances and suchlike, there’s also the degree of separation between reporting and editorialising. Some newspapers have a very definite demarcation, others allow the two to merge together.
No doubt not quite what the OP intended, but the oft-quoted (in this instance via Wikipedia) Yes, Prime Minister guide to the affiliations of the British press in terms of their target readership:
And the American version of the previous:
Note: Original intarweb version edited to remove some unfunny chauvinism undoubtedly inserted by a lower-middle-class Wal-Mart conservative.