| Capital: | Monticello |
|---|---|
| Origen y Formación del condado: | Ulster County |
| Población: | 77,547 habitantes |
| Densidad: | 78 habitantes/Sq mi |
| Área: | 997 sq mi |
| Localización del condado dentro de New York: |
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Localidades en Sullivan, New York
- Barryville
- Bethel
- Bloomingburg
- Bridgeville
- Burlingham
- Callicoon (town)
- Callicoon Center
- Cochecton
- Debruce
- Delaware
- Eldred
- Fallsburg
- Ferndale
- Forestburgh
- Fremont
- Fremont Sullivan County
- Fremont Center
- Glen Spey
- Glen Wild
- Grahamsville
- Handsome Eddy
- Hankins
- Harris
- Haven
- Highland Lake
- Hortonville
- Hurleyville
- Jeffersonville
- Kauneonga Lake
- Kenoza Lake
- Kiamesha Lake
- Lake Huntington
- Lew Beach
- Liberty
- Liberty (town)
- Liberty Village
- Livingston Manor
- Loch Sheldrake
- Long Eddy
- Lumberland
- Minisink Ford
- Mongaup Valley
- Monticello
- Mountain Dale
- Narrowsburg
- Neversink
- North Branch
- Obernburg
- Parksville
- Phillipsport
- Pond Eddy
- Rockland
- Rock Hill
- Roscoe
- Smallwood
- South Fallsburg
- Summitville
- Thompson
- Thompsonville
- Tusten
- Westbrookville
- White Lake
- Woodbourne
- Woodridge
- Wurtsboro
- Wurtsboro Hills
- Youngsville