As an unincorporated area, Travilah's boundaries are not officially defined. Travilah 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 39°3'23" North, 77°14'14" West (39.056453, -77.237198)1.
According to the United States Census Bureau, the place has a total area of 40.3 km² (15.6 mi²). 37.2 km² (14.4 mi²) of it is land and 3.1 km² (1.2 mi²) of it is water. The total area is 7.65% water.
As of the census of 2000, there are 7,442 people, 2,366 households, and 2,122 families residing in the area. The population density is 200.0/km² (517.9/mi²). There are 2,447 housing units at an average density of 65.7/km² (170.3/mi²). The racial makeup of the area is 79.80% White, 3.48% African American, 0.08% Native American, 13.71% Asian, 0.04% Pacific Islander, 0.70% from other races, and 2.19% from two or more races. 3.72% of the population are Hispanic or Latino of any race.
There are 2,366 households out of which 45.4% have children under the age of 18 living with them, 83.8% are married couples living together, 4.3% have a female householder with no husband present, and 10.3% are non-families. 8.7% of all households are made up of individuals and 4.4% have someone living alone who is 65 years of age or older. The average household size is 3.15 and the average family size is 3.28.
In the area, the population is spread out with 29.5% under the age of 18, 4.2% from 18 to 24, 20.4% from 25 to 44, 34.9% from 45 to 64, and 11.0% who are 65 years of age or older. The median age is 43 years. For every 100 females there are 96.1 males. For every 100 females age 18 and over, there are 92.2 males.
The median income for a household in the area is $160,323, and the median income for a family is $171,879. Males have a median income of $100,000 versus $55,000 for females. The per capita income for the area is $77,129. 2.4% of the population and 1.6% of families are below the poverty line. Out of the total people living in poverty, 0.7% are under the age of 18 and 4.0% are 65 or older.