It is bounded on the east by U.S. Route 130 and U.S. Route 206, on the south by Black's Creek and Interstate 295, and on the north by the Mile Hollow Run. Across the Delaware River is Falls Township in Bucks County, Pennsylvania. The Census Bureau's 2006-2010 American Community Survey showed that (in 2010 inflation-adjusted dollars) median household income was $66,557 (with a margin of error of +/- $9,567) and the median family income was $90,165 (+/- $11,644). Males had a median income of $52,652 (+/- $10,201) versus $48,906 (+/- $9,108) for females. The per capita income for the borough was $36,814 (+/- $3,714). About 1.7% of families and 3.6% of the population were below the poverty line, including none of those under age 18 and 12.1% of those age 65 or over. As of the 2000 United States Census there were 3,969 people, 1,757 households, and 989 families residing in the city. The population density was 4,303.6 inhabitants per square mile (1,665.7/km2). There were 1,884 housing units at an average density of 2,042.8 per square mile (790.7/km2). The racial makeup of the city was 81.25% White, 13.08% African American, 0.05% Native American, 1.91% Asian, 0.03% Pacific Islander, 0.81% from other races, and 2.87% from two or more races. Hispanic or Latino of any race were 2.82% of the population. There were 1,757 households, out of which 24.9% had children under the age of 18 living with them, 39.2% were married couples living together, 13.1% had a female householder with no husband present, and 43.7% were non-families. 35.7% of all households were made up of individuals, and 10.9% had someone living alone who was 65 years of age or older. The average household size was 2.23 and the average family size was 2.93. In the city the population was spread out, with 20.9% under the age of 18, 7.7% from 18 to 24, 34.2% from 25 to 44, 23.2% from 45 to 64, and 14.0% who were 65 years of age or older.