Opp, Alabama

As of the 2020 United States census, there were 6,771 people, 2,701 households, and 1,768 families residing in the city.

As of the census[7] of 2010, there were 6,659 people and 2,655 households, and 1,823 families residing in the city. The population density was 388 people per square mile. The racial makeup of the city was 80.9% White, 16.7% Black or African American, 0.6% Native American, 0.3% Asian, and 1.2% from two or more races. 0.9% of the population were Hispanic or Latino of any race.

In 2000, there were 2,753 households, out of which 28.4% had children under the age of 18 living with them, 50.5% were married couples living together, 14.8% had a female householder with no husband present, and 30.8% were non-families. 28.8% of all households were made up of individuals, and 15.0% had someone living alone who was 65 years of age or older. The average household size was 2.33 and the average family size was 2.85.

In the city, the population was 23.3% under the age of 18, 7.9% from 18 to 24, 24.6% from 25 to 44, 23.6% from 45 to 64, and 20.6% who were 65 years of age or older. The median age was 41 years. For every 100 females, there were 79.8 males. For every 100 females age 18 and over, there were 76.9 males. The median income for a household in the city was $26,702, and the median income for a family was $32,436. Males had a median income of $27,821 versus $21,280 for females. The per capita income for the city was $15,281. About 14.2% of families and 18.2% of the population were below the poverty line, including 28.8% of those under age 18 and 15.8% of those age 65 or over.