| Constantia | |
| Settlement Type: | Town |
| Mapsize: | 260px |
| Coordinates: | 43.2478°N -76°W |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | New York |
| Subdivision Type2: | County |
| Subdivision Name2: | Oswego |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Sq Mi: | 99.67 |
| Area Land Sq Mi: | 56.77 |
| Area Water Sq Mi: | 42.91 |
| Area Water Percent: | 42.93 |
| Population As Of: | 2010 |
| Population Footnotes: | [2] |
| Population Total: | 4973 |
| Population Density Sq Mi: | 85.54 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Pop Est As Of: | 2016 |
| Population Est: | 4856 |
| Blank Name: | FIPS code |
| Blank Info: | 36-075-17904 |
| Area Total Km2: | 258.15 |
| Area Land Km2: | 147.02 |
| Area Water Km2: | 111.13 |
| Population Density Km2: | 33.03 |
Constantia is a town in Oswego County, New York, United States. The population was 4,973 at the 2010 census. The town is located in the southeastern part of the county. Within the town is a hamlet and census-designated place of the same name.
The town was first settled circa 1793 and was known then as "Rotterdam." Francis Adrian Vanderkemp and Marc Isambard Brunel were two of its citizens. The Town of Constantia was created from part of the Town of Mexico in 1808. In 1825, the town was reduced by the formation of the Town of Hastings, and was reduced again in 1839 to form the Town of West Monroe.
According to the United States Census Bureau, the town has a total area of 99.6 square miles (258.0 km2), of which 56.9 square miles (147.3 km2) is land and 42.8 square miles (110.8 km2) (42.93%) is water.
The southern town line is the opposite shore of Oneida Lake, which is the border of Madison County. The eastern town line is the border of Oneida County.
The Erie Canal, runs through the town, using Oneida Lake as a waterway.
The north boundary is marked by the south edge of the Tug Hill Plateau.
As of the census[3] of 2000, there were 5,141 people, 1,893 households, and 1,398 families residing in the town. The population density was 90.4sp=usNaNsp=us. There were 2,351 housing units at an average density of 41.3sp=usNaNsp=us. The racial makeup of the town was 98.29% White, 0.21% Black or African American, 0.66% Native American, 0.08% Asian, 0.02% Pacific Islander, 0.08% from other races, and 0.66% from two or more races. Hispanic or Latino of any race were 0.33% of the population.
There were 1,893 households, out of which 37.3% had children under the age of 18 living with them, 61.0% were married couples living together, 8.1% had a female householder with no husband present, and 26.1% were non-families. 19.0% of all households were made up of individuals, and 6.0% had someone living alone who was 65 years of age or older. The average household size was 2.72 and the average family size was 3.11.
In the town, the population was spread out, with 28.4% under the age of 18, 5.7% from 18 to 24, 31.5% from 25 to 44, 24.7% from 45 to 64, and 9.6% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 106.5 males. For every 100 females age 18 and over, there were 103.7 males.
The median income for a household in the town was $39,932, and the median income for a family was $45,373. Males had a median income of $31,276 versus $23,299 for females. The per capita income for the town was $15,818. About 6.2% of families and 9.5% of the population were below the poverty line, including 10.7% of those under age 18 and 3.6% of those age 65 or over.