Census Finder is a great resource for folks who can’t afford a paid subscription to the big genealogy guns like Ancestry but would still like to search through the US Federal Census. They provide links to census projects, some free, some not.
This link will take you to the listing for Northumberland County, Pennsylvania. After a recent inquiry into records for the Odd Fellows Orphanage, I thought this link might be helpful to the requester and others researching in Northumberland County.
You can easily get to the home page for Census Finders from the link if you would like to search a different county or even a different state.