Census Links is a growing catalog of links to transcriptions of census, tax lists, birth, death, marriage and military records, all freely available to help with your genealogy research.
The following site contains census index's for Lehigh County PA, years of 1820, 1830, 1840, 1850.
Includes 1772 Tax List for Weisenberg Twp., 1790 Census, Upper Saucon Twp., ``1790 Census, Weisenberg Twp., 1790 Census, Whitehall Twp.
From Bob's Genealogy World
From the UsGenWeb Census Project
1820 Census, Lehigh County, Pennsylvania