| Official Name: | Duncan Township, Pennsylvania |
| Settlement Type: | Township |
| Mapsize: | 250px |
| Image Map1: | Map of Pennsylvania highlighting Tioga County.svg |
| Mapsize1: | 250px |
| Map Caption1: | Map of Pennsylvania highlighting Tioga County |
| Established Title: | Settled |
| Established Date: | 1867 |
| Established Title2: | Incorporated |
| Established Date2: | 1873 |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 51.91 |
| Area Land Km2: | 51.91 |
| Area Water Km2: | 0.00 |
| Area Total Sq Mi: | 20.04 |
| Area Land Sq Mi: | 20.04 |
| Area Water Sq Mi: | 0.00 |
| Population Footnotes: | [2] |
| Population Total: | 188 |
| Population Density Km2: | 4.16 |
| Population Density Sq Mi: | 10.78 |
| Timezone: | Eastern Time Zone (North America) |
| Timezone Dst: | EDT |
| Blank Info: | 42-117-20232 |
| Pop Est As Of: | 2021 |
| Population Est: | 189 |
Duncan Township is a township in Tioga County, Pennsylvania, United States. The population was 188 at the 2020 census.[2]
According to the United States Census Bureau, the township has a total area of 19.8sqmi, all land.
Duncan Township is bordered by Charleston Township to the north, Bloss Township to the east and south, Morris Township to the east, south and west, and Delmar Township to the west and north.
As of the census[3] of 2000, there were 213 people, 91 households, and 56 families residing in the township. The population density was 10.8/mi2. There were 142 housing units at an average density of 7.2/mi2. The racial makeup of the township was 97.65% White, 0.47% African American, 0.94% Native American and 0.94% Asian. Hispanic or Latino of any race were 0.94% of the population.
There were 91 households, out of which 26.4% had children under the age of 18 living with them, 44.0% were married couples living together, 11.0% had a female householder with no husband present, and 37.4% were non-families. 31.9% of all households were made up of individuals, and 18.7% had someone living alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 2.93.
In the township the population was spread out, with 19.2% under the age of 18, 8.0% from 18 to 24, 30.5% from 25 to 44, 24.9% from 45 to 64, and 17.4% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 106.8 males. For every 100 females age 18 and over, there were 95.5 males.
The median income for a household in the township was $28,250, and the median income for a family was $40,625. Males had a median income of $26,875 versus $20,417 for females. The per capita income for the township was $27,001. None of the families and 6.8% of the population were living below the poverty line, including no under eighteens and 2.6% of those over 64.