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Sempronius, New York
Location within Cayuga County and New York
Location within Cayuga County and New York
Sempronius, New York is located in New York
Sempronius, New York
Sempronius, New York
Location in New York
Country United States
State New York
County Cayuga
 • Type Town Council
 • Total 29.72 sq mi (76.97 km2)
 • Land 29.34 sq mi (75.99 km2)
 • Water 0.38 sq mi (0.98 km2)
1,736 ft (529 m)
 • Total 895
 • Estimate 
 • Density 31.80/sq mi (12.28/km2)
Time zone UTC-5 (Eastern (EST))
 • Summer (DST) UTC-4 (EDT)
ZIP code
Area code(s) 315
FIPS code 36-011-66278
GNIS feature ID 0979479

Sempronius is a town in Cayuga County, New York, United States. The population was 895 at the 2010 census. The town was named after a Roman military and political leader by Robert Harpur, a clerk interested in the classics. Sempronius is in the southeastern part of the county, southeast of Auburn.


Sempronius was part of the Central New York Military Tract. The first settler arrived around 1793. Sempronius became a town in 1799, but its area was later reduced by the formation of newer towns: Marcellus (Onondaga County) in 1804, Moravia and Niles in 1833.


According to the United States Census Bureau, Sempronius has a total area of 29.7 square miles (77.0 km2), of which 29.3 square miles (76.0 km2) is land and 0.39 square miles (1.0 km2), or 1.28%, is water.

The northern part of the east town line borders the south end of Skaneateles Lake and Onondaga County; the rest of the eastern town line borders Cortland County.

New York State Route 41A is a north-south highway in the town.


Historical population
Census Pop.
1820 5,033
1830 5,705 13.4%
1840 1,304 −77.1%
1850 1,266 −2.9%
1860 1,262 −0.3%
1870 1,165 −7.7%
1880 1,138 −2.3%
1890 981 −13.8%
1900 896 −8.7%
1910 756 −15.6%
1920 575 −23.9%
1930 543 −5.6%
1940 526 −3.1%
1950 572 8.7%
1960 548 −4.2%
1970 649 18.4%
1980 733 12.9%
1990 802 9.4%
2000 893 11.3%
2010 895 0.2%
Est. 2016 933 4.2%
U.S. Decennial Census

As of the census of 2000, there were 893 people, 311 households, and 238 families residing in the town. The population density was 30.4 people per square mile (11.7/km2). There were 405 housing units at an average density of 13.8 per square mile (5.3/km2). The racial makeup of the town was 97.42% White, 0.56% African American, 0.34% Native American, 0.90% Asian, 0.22% Pacific Islander, and 0.56% from two or more races. Hispanic or Latino of any race were 0.78% of the population.

There were 311 households, out of which 41.5% had children under the age of 18 living with them, 61.4% were married couples living together, 7.7% had a female householder with no husband present, and 23.2% were non-families. 18.0% of all households were made up of individuals, and 5.1% had someone living alone who was 65 years of age or older. The average household size was 2.87 and the average family size was 3.21.

In the town, the population was spread out, with 30.9% under the age of 18, 7.6% from 18 to 24, 30.3% from 25 to 44, 25.0% from 45 to 64, and 6.2% who were 65 years of age or older. The median age was 33 years. For every 100 females, there were 111.6 males. For every 100 females age 18 and over, there were 116.5 males.

The median income for a household in the town was $38,611, and the median income for a family was $39,813. Males had a median income of $30,417 versus $22,438 for females. The per capita income for the town was $15,365. About 6.3% of families and 8.9% of the population were below the poverty line, including 9.5% of those under age 18 and 5.9% of those age 65 or over.

Communities and locations in Sempronius

  • Dresserville – A hamlet in the south part of the town at the influx of Mill Creek into Dresserville Creek. The village is named after Artemas Dresser, the first permanent settler and a subsequent owner of mills.
  • Dresserville Creek – A stream flowing out the west side of the town past Morse Hill. The stream flows to Owasco Inlet in Moravia.
  • Fall Creek – A stream flowing southward near the east town line. It flows southwest to the south end of Cayuga Lake in Ithaca.
  • Glen Haven – A hamlet on the southwest shore of Skaneateles Lake. It was the location of "water cure" resorts in the 19th century.
  • Hardy Corners – A location on NY Route 41A in the central part of the town.
  • Mill Brook – A stream flowing past Sempronius village. It is the primary tributary of Dresserville Creek.
  • Morse Hill – A hamlet in the western part of the town, west of Sempronius village.
  • Murphy Corners – A location north of Sempronius village.
  • Sayles Corners – A hamlet in the northwest part of the town.
  • Sempronius – The hamlet of Sempronius on NY-41A.
  • Wards Corners – A location between Sempronius village and Dresserville.
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