The name of the city is pronounced "dwohr'-dee" by most locals, or often the Spanish pronunciation "doo-ahr'-teh" is used. Newscasters and others unfamiliar with the area generally say "doo-wahr'-tay." It is bounded to the north by the San Gabriel Mountains, to the north and west by the cities of Bradbury and Monrovia, to the south by the city of Irwindale, and to the east by the cities of Irwindale and Azusa.
Duarte is located on historic U.S. Route 66 which today follows Huntington Drive through the middle of the city. For the past 13 years, Duarte has held an annual Salute to Route 66 Paradeon the third weekend in September on the original Route 66.
As of the census of 2000, there are 21,486 people, 6,635 households, and 4,889 families residing in the city. The population density is 1,241.9/km² (3,215.7/mi²). There are 6,805 housing units at an average density of 393.3/km² (1,018.5/mi²). The racial makeup of the city is 52.02% White, 9.08% Black or African American, 0.94% Native American, 12.62% Asian, 0.11% Pacific Islander, 19.99% from other races, and 5.23% from two or more races, while 43.41% of the population are Hispanic or Latino of any race.
There are 6,635 households out of which 38.9% have children under the age of 18 living with them, 54.8% are married couples living together, 13.6% have a female householder with no husband present, and 26.3% are non-families. 21.5% of all households are made up of individuals and 9.4% have someone living alone who is 65 years of age or older. The average household size is 3.16 and the average family size is 3.70.
In the city the population is spread out with 28.2% under the age of 18, 8.5% from 18 to 24, 29.6% from 25 to 44, 21.8% from 45 to 64, and 11.9% who are 65 years of age or older. The median age is 34 years. For every 100 females there are 90.9 males. For every 100 females age 18 and over, there are 85.8 males.
The median income for a household in the city is $50,744, and the median income for a family is $56,556. Males have a median income of $39,812 versus $33,045 for females. The per capita income for the city is $19,648. 11.3% of the population and 8.4% of families are below the poverty line. Out of the total population, 13.3% of those under the age of 18 and 10.6% of those 65 and older are living below the poverty line.