Joplin is located just to the north of Highway I-44, near its passage to the west into Oklahoma. In recent years the settlements of Joplin have spread north to abut Webb City, Missouri.
According to the United States Census Bureau, the city has a total area of 81.6 km² (31.5 mi²). 81.4 km² (31.4 mi²) of it is land and 0.2 km² (0.1 mi²) of it is water. The total area is 0.25% water.
As of the census of 2000, there are 45,504 people, 19,101 households, and 11,517 families residing in the city. The population density is 559.2/km² (1,448.4/mi²). There are 21,328 housing units at an average density of 262.1/km² (678.9/mi²). The racial makeup of the city is 91.44% White, 2.67% African American, 1.53% Native American, 0.74% Asian, 0.04% Pacific Islander, 0.98% from other races, and 2.59% from two or more races. 2.51% of the population are Hispanic or Latino of any race.
There are 19,101 households out of which 27.5% have children under the age of 18 living with them, 44.4% are married couples living together, 12.3% have a female householder with no husband present, and 39.7% are non-families. 32.4% of all households are made up of individuals and 12.5% have someone living alone who is 65 years of age or older. The average household size is 2.28 and the average family size is 2.89.
In the city the population is spread out with 23.2% under the age of 18, 13.5% from 18 to 24, 27.3% from 25 to 44, 20.3% from 45 to 64, and 15.6% who are 65 years of age or older. The median age is 35 years. For every 100 females there are 90.4 males. For every 100 females age 18 and over, there are 86.0 males.
The median income for a household in the city is $30,555, and the median income for a family is $38,888. Males have a median income of $28,569 versus $20,665 for females. The per capita income for the city is $17,738. 14.8% of the population and 10.5% of families are below the poverty line. Out of the total people living in poverty, 18.8% are under the age of 18 and 9.4% are 65 or older.
Joplin, Missouri is the birthplace of: