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Denning, New York
Peekamoose and Table Mountains, NY.jpg
Table and Peekamoose mountains, the southernmost of the Catskill High Peaks, dominate the view in the town's higher ground.
Name origin: William Denning, early landowner and settler
Country United States
State New York
County Ulster
Landmark Table Mountain, Peekamoose Mountain
River Rondout Creek, Neversink River
Center Town Hall
 - elevation 1,960 ft (597 m)
 - coordinates 41°57′N 74°29′W / 41.95°N 74.483°W / 41.95; -74.483
Highest point
 - location Table Mountain
 - elevation 3,847 ft (1,173 m)
 - coordinates 41°57′31″N 74°24′18″W / 41.95861°N 74.405°W / 41.95861; -74.405
Lowest point
 - location Rondout Creek at Sullivan County line
 - elevation 960 ft (293 m)
 - coordinates 41°53′05″N 74°28′27″W / 41.88472°N 74.47417°W / 41.88472; -74.47417
Area 105.3 sq mi (273 km²)
 - land 105.2 sq mi (272 km²)
 - water 0.1 sq mi (0 km²)
Population 551 (2010)
Date 1849
Timezone Eastern (EST) (UTC-5)
 - summer (DST) EDT (UTC-4)
Postal code 12782
Area code 845
FIPS code 36-20247
GNIS feature ID 0978897

Denning is an isolated town in Ulster County, New York, USA. The population was 551 at the 2010 census. The town is named after an early landowner, William Denning. Denning is located in the western part of the county, deep inside the Catskill Mountains. The location of the town in the Catskill State Park accounts in part for its low population.


Denning was established in 1849 from part of the Town of Shandaken. The region had been part of the Hardenburgh Patent granted to Johannes Hardenburgh in 1708. William H. Denning, for whom the settlement was named, bought a tract of land at a tax sale.

The Red Hill Fire Observation Station was listed on the National Register of Historic Places in 2001.


According to the United States Census Bureau, the town has a total area of 105.3 square miles (273 km2), of which, 105.2 square miles (272 km2) of it is land and 0.1 square miles (0.26 km2) of it (0.07%) is water.

The town is in the Catskill Mountains and borders Sullivan County, New York. It is rugged and heavily wooded. Most settlement is concentrated around the hamlet of Sundown on Rondout Creek, along the two branches of the Neversink River or in the plateau between the two valleys northeast of Red Hill, at elevations 2,500 feet (762 m) above sea level and higher.

Since the town is entirely within the Catskill Park, large tracts of land are owned by the state Department of Environmental Conservation as part of New York's Forest Preserve. These forests are either in the Sundown Wild Forest in the eastern parts of the town or the Slide Mountain Wilderness Area in its central regions. Within the former are the three southernmost Catskill High Peaks: Peekamoose, Table and Lone mountains. At 3,847 feet (1,173 m), Table's summit is the highest point in the town. Slide Mountain, the highest peak in the Catskills, is north of Denning.

A lower mountain, 2,990-foot (910 m) Red Hill, has a fire tower on its summit popular with hikers. It is the only property in Denning listed on the National Register of Historic Places.


Historical population
Census Pop.
1850 447
1860 1,073 140.0%
1870 1,044 −2.7%
1880 1,036 −0.8%
1890 897 −13.4%
1900 782 −12.8%
1910 615 −21.4%
1920 419 −31.9%
1930 292 −30.3%
1940 300 2.7%
1950 233 −22.3%
1960 215 −7.7%
1970 297 38.1%
1980 474 59.6%
1990 524 10.5%
2000 516 −1.5%
2010 551 6.8%
Est. 2014 547 −0.7%
U.S. Decennial Census
Denning, NY, town hall
Town hall

As of the census of 2000, there were 516 people, 215 households, and 124 families residing in the town. The population density was 4.9 people per square mile (1.9/km²). There were 517 housing units at an average density of 4.9 per square mile (1.9/km²). The racial makeup of the town was 95.93% White, 0.97% Native American, 0.19% Asian, and 2.91% from two or more races. Hispanic or Latino of any race were 1.55% of the population.

There were 215 households out of which 18.1% had children under the age of 18 living with them, 49.8% were married couples living together, 6.0% had a female householder with no husband present, and 41.9% were non-families. 37.2% of all households were made up of individuals and 13.5% had someone living alone who was 65 years of age or older. The average household size was 2.25 and the average family size was 2.98.

In the town, the population was spread out with 17.4% under the age of 18, 7.9% from 18 to 24, 28.5% from 25 to 44, 28.7% from 45 to 64, and 17.4% who were 65 years of age or older. The median age was 43 years. For every 100 females there were 103.1 males. For every 100 females age 18 and over, there were 105.8 males.

The median income for a household in the town was $40,893, and the median income for a family was $50,729. Males had a median income of $37,750 versus $25,179 for females. The per capita income for the town was $23,846. About 5.7% of families and 12.0% of the population were below the poverty line, including 9.3% of those under age 18 and 8.8% of those age 65 or over.

Communities and locations in Denning

  • Branch: A hamlet on CR 47, northeast of Frost Valley.
  • Bull Run: A hamlet north of Sundown on NY 42.
  • Denning: The hamlet of Denning is by the East Branch of the Neversink River.
  • Frost Valley: A hamlet on CR 47.
  • Greenville: A hamlet near the east town line on CR 46.
  • Ladleton: A hamlet by the East Branch of the Neversink River, southwest of Denning village.
  • Peekamoose: A hamlet near the east town line on NY 42.
  • Sundown: A hamlet near the south town line on CR 46.
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