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Cabin John, Maryland
Location of Cabin John, Maryland
Location of Cabin John, Maryland
Coordinates: 38°58′30″N 77°9′33″W / 38.97500°N 77.15917°W / 38.97500; -77.15917Coordinates: 38°58′30″N 77°9′33″W / 38.97500°N 77.15917°W / 38.97500; -77.15917
Country  United States
State  Maryland
County Montgomery
Area
 • Total 1.3 sq mi (3.4 km2)
 • Land 1.0 sq mi (2.5 km2)
 • Water 0.3 sq mi (0.9 km2)
Elevation
171 ft (52 m)
Population
 (2000)
 • Total 1,734
 • Density 1,762.4/sq mi (680.5/km2)
Time zone UTC−5 (Eastern (EST))
 • Summer (DST) UTC−4 (EDT)
ZIP code
20818
Area code(s) 301, 240
FIPS code 24-12075
GNIS feature ID 0589873

Cabin John is a census-designated place and an unincorporated area in Montgomery County, Maryland, United States. Its original southern boundary encompassed a section of the Chesapeake and Ohio Canal (C&O) including locks 8–12, and the northern shore of the Potomac River. It is also the access point to Plummers Island, originally owned by The Washington Biologists’ Field Club and called “the most thoroughly studied island in North America.” Cabin John is the location of the Union Arch Bridge built between 1857 and 1864; at the time of its completion, the bridge embodied the longest single-span masonry arch in the world and remains the longest in the United States.

Geography

As an unincorporated area, Cabin John's boundaries are not officially defined. Cabin John is, however, recognized by the United States Census Bureau as a census-designated place, and by the United States Geological Survey as a populated place located at 38°58′30″N 77°9′33″W / 38.97500°N 77.15917°W / 38.97500; -77.15917 (38.975110, -77.159281).

According to the United States Census Bureau, the place has a total area of 1.3 square miles (3.4 km2), of which, 1.0 square mile (2.6 km2) of it is land and 0.3 square miles (0.78 km2) of it (25.56%) is water.

Demographics

At the 2000 census there were 1,734 people, 668 households, and 464 families residing in the area. The population density was 1,762.4 people per square mile (683.2/km2). There were 688 housing units at an average density of 699.3/sq mi (271.1/km2). The racial makeup of the area was 85.01% White, 3.63% African American, 0.23% Native American, 8.77% Asian, 0.46% from other races, and 1.90% from two or more races. Hispanic or Latino of any race were 2.71%.

Of the 668 households 36.2% had children under the age of 18 living with them, 60.9% were married couples living together, 5.7% had a female householder with no husband present, and 30.5% were non-families. 24.3% of households were one person and 8.5% were one person aged 65 or older. The average household size was 2.60 and the average family size was 3.11.

The age distribution was 25.8% under the age of 18, 4.7% from 18 to 24, 25.3% from 25 to 44, 34.9% from 45 to 64, and 9.3% 65 or older. The median age was 42 years. For every 100 females, there were 94.8 males. For every 100 females age 18 and over, there were 93.0 males.

The median household income was $95,692 and the median family income was $125,493. Males had a median income of $84,112 versus $64,271 for females. The per capita income for the area was $52,401. None of the families and 2.4% of the population were living below the poverty line, including no one under age eighteen and 11.3% of those over 64.

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