Cabin John is a census-designated place and an unincorporated area in Montgomery County, Maryland, United States.
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 km), of which, 1.0 square mile (2.6 km) of it is land and 0.3 square miles (0.78 km) of it (25.56%) is water.
As of the census of 2000, 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 population.
There were 668 households out of which 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 all households were made up of individuals and 8.5% had someone living alone who was 65 years of age or older. The average household size was 2.60 and the average family size was 3.11.
In the area, the population was spread out with 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% who were 65 years of age 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 income for a household in the area was $95,692, and the median income for a family 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.