Coffeyville is home to online retailer Amazon.com's largest distribution center, leased in 1999. It was opened in a facility previously operated by Golden Books.
Coffeyville has experienced a slow and steady population decline since around 1960 when its population peaked. As of 2006 the population was estimated to be 10,387 in the year 2006, a decrease of 645, or -5.8%, over the previous six years.
As of the U.S. Census in 2000, there were 11,021 people, 4,691 households, and 2,847 families residing in the city. The population density was 1,562.1 people per square mile (602.7/km²). There were 5,550 housing units at an average density of 786.6/sq mi (303.5/km²). The racial makeup of the city was 75.76% White, 12.12% Black or African American, 4.97% Native American, 0.60% Asian, 0.04% Pacific Islander, 1.63% from other races, and 4.87% from two or more races. Hispanic or Latino of any race were 3.82% of the population.
There were 4,691 households out of which 26.8% had children under the age of 18 living with them, 45.0% were married couples living together, 11.9% had a female householder with no husband present, and 39.3% were non-families. 35.4% of all households were made up of individuals and 18.6% had someone living alone who was 65 years of age or older. The average household size was 2.25 and the average family size was 2.90.
In the city the population was spread out with 24.0% under the age of 18, 10.0% from 18 to 24, 23.3% from 25 to 44, 21.3% from 45 to 64, and 21.4% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 87.2 males. For every 100 females age 18 and over, there were 82.1 males.
The median income for a household in the city was $25,542, and the median income for a family was $33,180. Males had a median income of $29,199 versus $17,940 for females. The per capita income for the city was $15,182. About 10.9% of families and 15.0% of the population were below the poverty line, including 18.6% of those under age 18 and 10.9% of those age 65 or over.