I am working on an underground railroad project and I've got a list of all the African-Americans/Mulattos living in Northumberland County in the 1850 Census. I want to make this list available to anyone who is interested in it - whether for general interest or for genealogy. There are a few families, including Bulter, Young, James, Gilbert, and many individuals living here and there (mostly with lawyers, physicians, and at inns). Most people were born in PA, but some were from Virginia, Delaware, Maryland, and Kentucky. I've done a basic search for some of the people with more unusual names to see if they stuck around the area but had no luck finding them anywhere else. If anyone is interested in the list, feel free to e-mail me, or I could post it here if a lot of people were interested.
Hope my info can be of help to someone!