Here is the oldest US Census record I have for any of my ancestors. My 4th great-grandfather is listed as Peter Stroher, second from the top in the left column. Below him is his father-in-law George Stauch, my 5th great-grandfather. My other colonial ancestry lines (Ogdens, etc.) were Loyalists who headed up to Canada after the US won its independence, so they're not in the US census until they come back later for homesteads in South Dakota.