Best SEO and internet marketing services in Essex County NY. Essex County zip codes - 12851, 12852, 12855, 12857, 12858, 12870, 12872, 12879, 12883, 12913, 12928, 12932, 12936, 12941, 12942, 12943, 12946, 12950, 12956, 12960, 12961, 12964, 12974, 12975, 12977, 12987, 12993, 12996, 12997, 12998 Essex County is a county in the U. S. state of New York. It is located in the north-east of the state. The county was founded in 1799. It was named after the English county of Essex. The county’s seat is Elizabethtown. The largest town is North Elba. The total area of the county is 1,916 sq mi (that is 4,962 sq km). Land takes 1,794 sq mi (or 4,646 sq km) and water takes 122 sq mi (316 sq km). There is 6.4% of water. The population is 39,370 people according to the census in 2010. The density is 22/sq mi (8/sq km). There are such private schools: Mountain Lake Academy, National Sports Academy, North County School, Northwood School, St. Agnes School. Also there is North Country Community College. Such airports are in the Essex County: Lake Placid Airport, Marcy Field, Schroon Lake Airport, Ticonderoga Municipal Airport. Such famous people lived in the county: Vincent Colyer, Robert Garrow, Ben Goldwasser, Solomon Northup, Tom Tyler, Sophie Clarke and others. It is the third largest county in New York State. The Lake Champlain and the Ausable River are located in the county. The Mount Marcy, the highest point, is in the town of Keene.