San Francisco International Airport is adjacent to the city.
Geography\nMillbrae is located at 37°36'3" North, 122°24'5" West (37.600735, -122.401354)1.
According to the United States Census Bureau, the city has a total area of 8.4 km² (3.2 mi²). 8.3 km² (3.2 mi²) of it is land and 0.1 km² (0.04 mi²) of it is water. The total area is 0.62% water.
Demographics\nAs of the census of 2000, there are 20,718 people, 7,956 households, and 5,513 families residing in the city. The population density is 2,492.0/km² (6,446.4/mi²). There are 8,113 housing units at an average density of 975.8/km² (2,524.4/mi²). The racial makeup of the city is 63.04% White, 0.80% African American, 0.23% Native American, 27.28% Asian, 1.15% Pacific Islander, 3.60% from other races, and 3.91% from two or more races. 11.47% of the population are Hispanic or Latino of any race.
There are 7,956 households out of which 28.3% have children under the age of 18 living with them, 55.7% are married couples living together, 9.9% have a female householder with no husband present, and 30.7% are non-families. 25.1% of all households are made up of individuals and 13.7% have someone living alone who is 65 years of age or older. The average household size is 2.56 and the average family size is 3.08.
In the city the population is spread out with 20.6% under the age of 18, 6.4% from 18 to 24, 27.5% from 25 to 44, 24.7% from 45 to 64, and 20.8% who are 65 years of age or older. The median age is 42 years. For every 100 females there are 89.8 males. For every 100 females age 18 and over, there are 87.0 males.
The median income for a household in the city is $68,404, and the median income for a family is $82,061. Males have a median income of $51,867 versus $40,249 for females. The per capita income for the city is $33,193. 3.4% of the population and 2.2% of families are below the poverty line. Out of the total people living in poverty, 2.2% are under the age of 18 and 4.6% are 65 or older.