Lancaster county is finally starting to catch up in the technology age. I do not believe their GIS is up and running as of now, but they do have a Government site that may help you some. I have some software that is offered to real estate estate professionals that may aid you as well. Feel free to contact me for more information.
York County GIS Link http://www.yorkcountygov.com/content.aspx?deptID=60&cont
Tim and Gina
The Guilliams Team