Best SEO and internet marketing services in Lewis County NY. Lewis County zip codes - 13305, 13312, 13325, 13327, 13343, 13345, 13368, 13404, 13433, 13473, 13620, 13626, 13627, 13631 Lewis County is a county in the U.S. state of New York. The county got its name after Morgan Lewis, the governor of New York at that time when the county was created. The village of Lowville is county’s seat. More than 27,000 people live there according to the census in 2010. The Lewis County was separated from Oneida County in 1805. The county has area of 1,290 square miles (that is 3,300 km2), where land takes 1,275 square miles and water takes 15 square miles. Lewis County is situated in north-west of New York State. The Adirondack Park is in the east of the county. The Black River Valley is situated in the county. Such famous people are somehow connected with Lewis County: Peter Ostrum – an actor, Fred A. Young – Judge, Florence Augusts Merriam Bailey – ornithologist, Clinton Hart Merriam – zoologist, ornithologist, entomologist, ethnographer and naturalist. White and Black Afro Americans live there, Native Americans, Asians, Pacific Islanders, Poles, Germans, Englishmen, Spaniards, Frenchmen and others. 97% of people speak English and only 1% of the population speaks Spanish as their native and first language. There are many towns (Diana, Greig, Lewis, Turin, Watson, New Bremen, and others), villages and three hamlets in the county.