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Mountain Towns and a Storied Resort Landscape

Sullivan County, New York

Sullivan County combines Catskill Mountain communities with a southwestern boundary along the Delaware River. Monticello serves as the county seat, while towns such as Bethel, Callicoon, and Liberty add distinct local identities. Its twentieth-century resort history remains an important part of the region’s cultural story. The U.S. Census Bureau estimated 80,586 residents in Sullivan County, New York, on July 1, 2025.

Sullivan County at a Glance

Population80,586 (July 1, 2025 Census estimate)
County SeatMonticello
StateNew York
Established1809
ZIP CodesVary by address
Total Area, Including Water996.615 square miles, including water (2020 Census geography)
Road InformationState transportation resources below
Area CodesSee local phone listings
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Discover Sullivan County

Sullivan County

Sullivan County was created from Ulster County in 1809, with Monticello becoming its county seat. Its name honors John Sullivan, whose Revolutionary War campaign devastated Haudenosaunee communities, a history that should not be separated from the namesake. During the twentieth century, the county became associated with the hotels and resorts of the Borscht Belt. That later cultural history adds another layer to a Catskill landscape with a much longer and more complex past.

Monticello, Liberty, Bethel, and Callicoon offer different starting points within Sullivan County. The Delaware River forms the southwestern boundary with Pennsylvania, while mountain terrain and part of Catskill Park shape other areas. The county’s resort legacy is one useful theme, but it is not the only one. A trip organized around a river community or a particular town can reveal local distinctions beyond the region’s widely recognized vacation history.

What Shapes Us

Local Character

Sullivan County combines Catskill Mountain communities with a southwestern boundary along the Delaware River. Monticello serves as the county seat, while towns such as Bethel, Callicoon, and Liberty add distinct local identities.

Community History

Its name honors John Sullivan, whose Revolutionary War campaign devastated Haudenosaunee communities, a history that should not be separated from the namesake.

Around the County

Monticello, Liberty, Bethel, and Callicoon offer different starting points within Sullivan County. The Delaware River forms the southwestern boundary with Pennsylvania, while mountain terrain and part of Catskill Park shape other areas.

Mountain communities carry stories beyond their resort past.
New York State Department of Transportation

New York & Atlantic Railway Receives $6.5 Million Federal CRISI Grant, Joining State and Private Funding in a $10.9 Million Partnership to Upgrade Four Locomotives with Cleaner Technology

Read the Story Oct 28, 2026 • 2 min read
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County Resources

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Get to Know Sullivan County

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Local Questions

Sullivan County Questions, Answered

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80,586 (July 1, 2025 Census estimate). This is a dated Census Bureau estimate, rather than a live resident count.

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