If copiers, laser printers, or monitors are functional, donating them doesn't require any effort more than delivery. Just contact your favorite school, religious, or social organization or a poor friend.
Donating computers is problematical because most individuals and businesses keep them until they are too out of date to be of much use to an unsophisticated user. The effort to cleanse them of proprietary information, refresh their licenses, and prepare them as a turn-key donation is more than the value considering new computers are available well under $500.
There are businesses that recycle computers in bulk (I throw away a couple brochures a month). HP and Dell will do so if you are buying new computers from them and may even take computers from non-customers. Expect to pay $30-$50 each for the service. Also, if you are sending your hard disc, check the recycler's reputation for destroying your data. Better still, remove the discs and find the nearest construction project to drive over them with a bulldozer (anything less MIGHT be recoverable by a dedicated hacker). This is especially critical for a financial or medical business. Even if "all data was on the server", there might be temp or cache files that could be valuable to ID theives.
A hobbiest may take one or two computers off your hands, but again you must get assurances as to the security of your data and licensed software. Of course, if they're 1.6 GHz CPU and 256 MB RAM or better, talk to me. You could post an offer here.
The county recycling center will take single computers from residents. Otherwise, you need to contact your trash hauler as hazardous waste.