Port Henry is a hamlet (and census-designated place) in Essex County, New York, United States. The population was 1,194 at the 2010 census.
Port Henry is located in eastern Essex County at 44°2′43″N 73°27′40″W / 44.04528°N 73.46111°W / 44.04528; -73.46111 (44.045238, −73.461011), in the eastern part of the town of Moriah. The village is on the west shore of Lake Champlain at the north end of Bulwagga Bay and is in the Adirondack Park.
According to the United States Census Bureau, the village has a total area of 1.5 square miles (3.8 km), of which 1.2 square miles (3.0 km) is land and 0.3 square miles (0.8 km), or 20.29%, is water. Port Henry is located on conjoined New York State Route 9N and New York State Route 22 (North/South Main Street) at the junction of County Road 4 (Broad Street).
As of the census of 2000, there were 1,152 people, 491 households, and 295 families residing in what was then village. The population density was 958.7 people per square mile (370.7/km²). There were 596 housing units at an average density of 496.0 per square mile (191.8/km²). The racial makeup of the village was 97.66% White, 0.52% African American, 0.09% Native American, 0.61% Asian, 0.61% from other races, and 0.52% from two or more races. Hispanic or Latino of any race were 1.30% of the population.
There were 491 households out of which 27.9% had children under the age of 18 living with them, 42.0% were married couples living together, 12.8% had a female householder with no husband present, and 39.9% were non-families. 33.6% of all households were made up of individuals and 16.7% had someone living alone who was 65 years of age or older. The average household size was 2.29 and the average family size was 2.90.
In the village, the population was spread out with 24.7% under the age of 18, 7.8% from 18 to 24, 25.4% from 25 to 44, 22.1% from 45 to 64, and 19.9% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 94.6 males. For every 100 females age 18 and over, there were 86.9 males.
The median income for a household in the village was $29,306, and the median income for a family was $40,556. Males had a median income of $34,821 versus $20,703 for females. The per capita income for the village was $17,455. About 12.2% of families and 19.2% of the population were below the poverty line, including 27.6% of those under age 18 and 10.7% of those age 65 or over.