William Loomis, b. about 1800

Someone out there MUST have my William Loomis in your family history! My gr gr grandfather was William Loomis. Census records show he was born in New York in about 1805, however, I believe it was nearer 1800, as he appeared to have married in about 1821. I think Mary M Loomis was his daughter and she was born in 1822. Mary's mother must have died young. William's second wife was Elvira Van Tassel. She died in Hancock County, IL in 1850. William took another young wife, Lucinda Gearhard, in late 1850 in Hancock County, IL. William, Lucinda and a young son died before 1855. My ancestor was born in New York in about 1800, traveled to IL in the 1830's with the Van Tassel, Lake and McAuley families to settle in Hancock County, IL until the early 1850's when a group from Hancock County decided to move on to Clarke County, Iowa. Please contact me if you have any information about one of these families. Thank you so much.