Tioga is located at Template:Coord (41.906467, -77.135532)Template:GR. According to the United States Census Bureau, the borough has a total area of 0.5 square miles (1.3 km²), of which, 0.4 square miles (1.1 km²) of it is land and 0.1 square miles (0.2 km²) of it (17.31%) is water. Tioga is surrounded by Tioga Township.
As of the censusTemplate:GR of 2000, there were 622 people, 239 households, and 148 families residing in the borough. The population density was 1,440.0 people per square mile (558.5/km²). There were 261 housing units at an average density of 604.2/sq mi (234.4/km²). The racial makeup of the borough was 99.04% White, 0.32% African American, 0.16% Native American, and 0.48% from two or more races. Hispanic or Latino of any race were 0.32% of the population. There were 239 households out of which 37.2% had children under the age of 18 living with them, 48.5% were married couples living together, 10.5% had a female householder with no husband present, and 37.7% were non-families. 28.0% of all households were made up of individuals and 10.0% 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 3.23. In the borough the population was spread out with 31.0% under the age of 18, 9.5% from 18 to 24, 29.6% from 25 to 44, 16.7% from 45 to 64, and 13.2% who were 65 years of age or older. The median age was 32 years. For every 100 females there were 90.2 males. For every 100 females age 18 and over, there were 92.4 males. The median income for a household in the borough was $27,404, and the median income for a family was $34,500. Males had a median income of $29,519 versus $19,479 for females. The per capita income for the borough was $16,905. About 8.8% of families and 13.2% of the population were below the poverty line, including 15.6% of those under age 18 and 4.9% of those age 65 or over.