The Village of Middleport lies on the eastern edge of Niagara County, mostly inside the boundaries of the Town of Royalton, but a small part is within the Town of Hartland. Middleport is a port on the Erie Canal.
As of the census of 2000, there were 1,917 people, 756 households, and 508 families residing in the village. The population density was 2,195.9 people per square mile (850.8/km²). There were 828 housing units at an average density of 948.5/sq mi (367.5/km²). The racial makeup of the village was 97.39% White, 0.83% African American, 0.26% Native American, 0.47% Asian, 0.26% from other races, and 0.78% from two or more races. Hispanic or Latino of any race were 1.77% of the population.
There were 756 households out of which 35.4% had children under the age of 18 living with them, 52.5% were married couples living together, 10.3% had a female householder with no husband present, and 32.7% were non-families. 27.6% of all households were made up of individuals and 13.9% had someone living alone who was 65 years of age or older. The average household size was 2.54 and the average family size was 3.11.
In the village the population was spread out with 28.7% under the age of 18, 6.4% from 18 to 24, 29.3% from 25 to 44, 20.7% from 45 to 64, and 14.9% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 90.0 males. For every 100 females age 18 and over, there were 87.5 males.
The median income for a household in the village was $36,464, and the median income for a family was $44,712. Males had a median income of $35,135 versus $22,500 for females. The per capita income for the village was $17,043. About 6.3% of families and 8.3% of the population were below the poverty line, including 7.1% of those under age 18 and 8.8% of those age 65 or over.