This collection of tax lists, land grants includes some unusual sources including lists of dog owners, those paid bounties for squirrel scalps, and so on, indexing many records of Cecil County residents.

This is not all inclusive -- I know of some residents I am not able to find in this, but it is a useful reference that includes some unusual sources.

Some parts of Cecil became Chester County PA after the Mason Dixon line in 1760's so this may include some later PA residents. ( )