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According to the United States Census Bureau, the base has a total area of 41.2 km² (15.9 mi²). 39.6 km² (15.3 mi²) of it is land and 1.6 km² (0.6 mi²) of it is water. The total area is 3.78% water.
As of the census of 2000, there are 19,089 people, 3,476 households, and 3,399 families residing in the base. The population density is 482.0/km² (1,248.5/mi²). There are 3,560 housing units at an average density of 89.9/km² (232.8/mi²). The racial makeup of the base is 60.44% White, 20.34% African American, 1.36% Native American, 3.41% Asian, 1.79% Pacific Islander, 6.23% from other races, and 6.44% from two or more races. 13.13% of the population are Hispanic or Latino of any race.
There are 3,476 households out of which 85.8% have children under the age of 18 living with them, 89.3% are married couples living together, 6.6% have a female householder with no husband present, and 2.2% are non-families. 2.0% of all households are made up of individuals and 0.0% have someone living alone who is 65 years of age or older. The average household size is 3.75 and the average family size is 3.78.
In the town the population is spread out with 32.1% under the age of 18, 28.0% from 18 to 24, 37.5% from 25 to 44, 2.0% from 45 to 64, and 0.4% who are 65 years of age or older. The median age is 22 years. For every 100 females there are 168.3 males. For every 100 females age 18 and over, there are 212.5 males.
The median income for a household in the town is $32,384, and the median income for a family is $32,251. Males have a median income of $20,878 versus $20,086 for females. The per capita income for the town is $12,865. 8.2% of the population and 7.1% of families are below the poverty line. Out of the total people living in poverty, 10.7% are under the age of 18 and 0.0% are 65 or older.
A non-official website is at http://www.fortlewis.com/ with a map at http://www.fortlewis.com/fortlewis/basemap.php [ http://www.fortlewis.com/ also has information on the adjacent military bases: McChord Air Force Base and Camp Murray (Washington National Guard) ]