Port Byron is a village in Cayuga County, New York, United States. The population was 1,290 at the 2010 census. It is in the town of Mentz north of Auburn.
Port Byron is located at 43°2′N 76°38′W / 43.033°N 76.633°W / 43.033; -76.633 (43.0368, -76.6254). According to the United States Census Bureau, the village has a total area of 1.01 square miles (2.61 km), of which 0.98 square miles (2.54 km) is land and 0.031 square miles (0.08 km), or 2.91%, is water.
The village is at the junction of Routes 31 and 38. The New York State Thruway passes through the northwest corner of the village but with no direct access. The Owasco Outlet flows northward from Owasco Lake to the Seneca River through the village. It provided substantial water power to the early village.
As of the census of 2000, there were 1,297 people, 501 households, and 350 families residing in the village. The population density was 1,287.7 people per square mile (495.8/km). There were 527 housing units at an average density of 523.2 per square mile (201.5/km). The racial makeup of the village was 95.22% White, 1.54% African American, 0.39% Native American, 0.15% Asian, 1.23% from other races, and 1.46% from two or more races. Hispanic or Latino of any race were 2.16% of the population.
There were 501 households out of which 32.1% had children under the age of 18 living with them, 47.9% were married couples living together, 16.2% had a female householder with no husband present, and 30.1% were non-families. 23.4% of all households were made up of individuals and 10.6% had someone living alone who was 65 years of age or older. The average household size was 2.57 and the average family size was 2.98.
In the village, the population was spread out with 26.0% under the age of 18, 7.8% from 18 to 24, 28.9% from 25 to 44, 21.5% from 45 to 64, and 15.8% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 93.0 males. For every 100 females age 18 and over, there were 91.2 males.
The median income for a household in the village was $35,625, and the median income for a family was $37,054. Males had a median income of $30,875 versus $20,404 for females. The per capita income for the village was $15,741. About 11.0% of families and 12.9% of the population were below the poverty line, including 13.3% of those under age 18 and 12.9% of those age 65 or over.