Sullivan County, New York

County seat: Monticello · Population 80,586 (2025) · 968 sq mi

Sullivan County is the 32nd most populous of New York's 62 counties, with 80,586 people (2025 estimate). Its county seat is Monticello. The map shows its 6 cities and towns and the 5 neighboring counties.

Map of Sullivan County, New York with cities, towns and the county boundary
Sullivan County, New York with its cities and towns, unincorporated communities (CDPs) and neighboring counties. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
Download PDF (Letter) 114 KBPNG image 96 KBNew York county map

Sullivan County facts

County seat
Monticello
Population (2025 estimate)
80,586 +2.5% since 2020
Land area
968 sq mi 18th largest of 62
Water area
29 sq mi
Population density
83 per sq mi
Established
1809
Same name
One of 6 Sullivan Counties in the US
Named after
John Sullivan American general, politician and judge from New Hampshire (1740-1795)
Largest city
Thompson 16,722
Median household income
$72,382
Cities and towns
6 plus 25 CDPs
ZIP codes
62
Time zone
Eastern
FIPS code
36105

Cities and towns in Sullivan County

Sullivan County has 6 incorporated cities, towns and villages. Populations count the people living inside Sullivan County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Monticello (county seat)Village7,195
LibertyVillage5,097
WurtsboroVillage1,081
BloomingburgVillage978
WoodridgeVillage736
JeffersonvilleVillage389

Unincorporated communities (CDPs)

Census-designated places are communities without their own city government; the county provides their services.

CommunityPopulationAlso in
Rock Hill2,546
South Fallsburg1,914
Fallsburg1,865
Loch Sheldrake1,308
Wurtsboro Hills1,179
Hurleyville1,061
Livingston Manor727
Smallwood693
Roscoe627
Mountain Dale499
Narrowsburg482
Kiamesha Lake469
Barryville461
Kauneonga Lake461
Woodbourne439
Callicoon350
Lake Huntington326
Grahamsville249
Mongaup Valley235
Hankins225
Hortonville205
Swan Lake161
Eldred136
Bridgeville65
White Lake65

ZIP codes in Sullivan County

62 ZIP codes reach into Sullivan County. ZIP codes ignore county lines, so some also cover a neighboring county.

Population of Sullivan County, 2020–2025

Sullivan County grew by 1,968 people (+2.5%) between April 2020 and July 2025: 563 more births than deaths and a net gain of 1,521 people from migration.

Year (July 1)Population
202078,461
202179,745
202279,868
202380,413
202480,901
202580,586

Neighboring counties

Printable Sullivan County map

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Sources

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