The population was 6,441 at the 2010 census.
The city was also the second settlement in the Northwest Territory after Marietta, located just upriver. The town was originally named Belle Prairie or “Beautiful Prairie.”
The city is home to the first library established in the Northwest Territory and the first female schoolteacher in Ohio.
As of the census of 2000, there were 6,660 people, 3,058 households, and 1,923 families residing in the city. The population density was 1,889.6 people per square mile (730.5/km²). There were 3,283 housing units at an average density of 931.5/sq mi (360.1/km²). The racial makeup of the city was 96.01% White, 2.10% African American, 0.11% Native American, 0.42% Asian, 0.12% from other races, and 1.25% from two or more races. Hispanic or Latino of any race were 0.48% of the population.
There were 3,058 households out of which 25.2% had children under the age of 18 living with them, 47.9% were married couples living together, 11.4% had a female householder with no husband present, and 37.1% were non-families. 32.7% of all households were made up of individuals and 14.0% had someone living alone who was 65 years of age or older. The average household size was 2.18 and the average family size was 2.73.
In the city the population was spread out with 20.9% under the age of 18, 8.3% from 18 to 24, 26.4% from 25 to 44, 26.0% from 45 to 64, and 18.4% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 84.1 males. For every 100 females age 18 and over, there were 80.1 males.
The median income for a household in the city was $29,603, and the median income for a family was $36,401. Males had a median income of $31,743 versus $21,789 for females. The per capita income for the city was $18,195. About 12.1% of families and 15.2% of the population were below the poverty line, including 26.7% of those under age 18 and 7.6% of those age 65 or over.
For additional demographics click here to see how many senior citizens we serve on a weekly basis at the Belpre Senior Center.