Mifflintown is a borough in and the county seat of Juniata County, Pennsylvania, United States. The population was 936 at the 2010 census.
Mifflintown is located at 40°34′15″N 77°23′44″W (40.570728, -77.395488). According to the United States Census Bureau, the borough has a total area of 0.1 square miles (0.26 km²), all of it land.
As of the census of 2000, there were 861 people, 372 households, and 210 families residing in the borough. The population density was 6,184.9 people per square mile (2,374.5/km²). There were 395 housing units at an average density of 2,837.4 per square mile (1,089.4/km²). The racial makeup of the borough was 93.96% White, 0.23% Native American, 0.23% Asian, 3.72% Pacific Islander, 1.39% from other races, and 0.46% from two or more races. Hispanic or Latino of any race were 8.71% of the population.
There were 372 households, out of which 28.0% had children under the age of 18 living with them, 40.3% were married couples living together, 12.9% had a female householder with no husband present, and 43.5% were non-families. 38.7% of all households were made up of individuals, and 18.8% had someone living alone who was 65 years of age or older. The average household size was 2.24 and the average family size was 2.97.
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