With a population of 19,597, Hanahan is a growing city. In the census of 2000 census, there were 12,937 people (13,818 in 2005 estimate), 5,243 households, and 3,339 families residing in the city. The population density was 1,284.7 people per square mile (496.0/km²). There were 5,698 housing units at an average density of 565.8 per square mile (218.5/km²). The racial makeup of the city was 70.6% White, 17.7% African American, 0.4% Native American, 2.0% Asian, 0.1% Pacific Islander, 0.3% from other races, and 1.9% from two or more races. Hispanic or Latino of any race were 6.17% of the population.
There were 5,243 households out of which 27.9% have youngsters under age 18 years living with them, 46.1% were married couples living together, 13.1% had a female householder with no husband present, and 36.3% were non-families. 27.7% of all households were made up of individuals and 7.4% had someone living alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 2.84.
In the city, the population was spread out with 21.0% under the age of 18, 13.8% from 18 to 24, 31.5% from 25 to 44, 22.2% from 45 to 64, and 11.5% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 112.4 males. For every 100 females age 18 and over, there were 113.0 males.
The median income for a household in the city was $39,327, and the median income for a family was $45,246. Males had a median income of $30,354 versus $22,374 for females. The per capita income for the city was $22,629. About 6.0% of families and 17.4% of the population were below the poverty line, including 10.9% of those under age 18 and 6.2% of those age 65 or over.