Q: I have an English degree and four years’ proofreading and editing experience. I am interested in doing copy editing/proofreading work from a home office and am curious if publishers ever hire remote employees.
A: I know that publishers can be remote, but you'd like to be a remote employee. That seems fair.
Given the quick turnaround time on the work that happnes at daily newspapers, few will take on someone new in a long-distance capacity. You'll have better luck looking for this kind of work with books, magazines and monthly in-house publications.
You can find leads for some of that work with various on-line sites (I'll decline to name/recommend any), but you'll see that the lowball bidding may make the work unattractive.
Best bet: Wear out some shoe leather to drum up clients who will have continuing needs for editing and proofing and then do your work at home.