William
The Kansas State Historical Society has some marriage records for Washington County available on microfilm for interlibrary loan. They do not have any birth records microfilmed, and I don't know if any were kept.
Here is the link for all the counties, then take the link to Washington, get the Mircrofilm number [enclosed in square brackets]. Give the film number and record name to your librarian to request an ILL of the film.
http://www.kshs.org/archives/lrfilm.htm
You might also check out this page at the KSHS, as STATE census films and newspapers are also available for ILL
http://www.kshs.org/research/index.htm
Good Luck
Dave Goldy
Overland Park, KS