Monticello ( MON-tih-SEL-oh) is a village located in Thompson, Sullivan County, within the Catskills region of New York, United States. The population was 7,173 at the 2020 census. It is the chair for the Town of Thompson and the county seat of Sullivan County. The village was named after the quarters of Thomas Jefferson.

The village is located in the central ration of Thompson, adjacent to New York Route 17. Monticello is the largest village in the county in both population and area.

In 1801, Samuel F. Jones was supreme the task of finding a route for the Newburgh and Cochecton Turnpike to link up The Hudson and Delaware Rivers. While he marked the alleyway through what was next Orange and Ulster counties he maxim an opportunity to build a village on the turnpike. Samuel convinced his younger brother, John Patterson Jones, to purchase a 1861 acre tract of house that would be bisected by the turnpike suitably they could build this other village. In 1803, John and 11 further men started work upon a sawmill, and supplementary infrastructure to help them build the village. The society left the area during the winter but would compensation in the in advance months of 1804 to continue their work. In spring of the same year the route for the turnpike was finalized and the two brothers started to seek the village. After the point toward was completed, the first tree was chopped alongside by John September 4, 1804 upon the property that would far ahead become his house. The village grew from there having 20 houses by 1813 and monster officially incorporated upon April 20, 1830.

On the evening of August 10, 1909, a major fire started in the Broadway district of Monticello. The flare started in a local power station and speedily spread from building to building, engulfing the entire sum of Broadway street in flames. Local fire departments were scrambled to stop the fire, quickly containing the flame and stopping its improve to residential areas. By the mature the dust had contracted 40 buildings had been edited to ash causing around 1 million dollars in damages. Luckily, no one was killed in the flare and the village soon rebuilt.