Initially a village, Bellbrook grew through annexation of territory from surrounding Sugarcreek Township. The first annexation, in 1970, helped push the population over 5,000 and led to Bellbrook achieving city status in 1974. With large amounts of buildable land, the area added over 1,000 housing units since the annexation.
On November 8, 2005, Sugarcreek Township residents defeated by 22 votes a measure supporting the creation of a commission to study a merger with Sugarcreek Township. Bellbrook voters approved the study. However, the measure required both the city and the township to approve the study. Bellbrook and Sugarcreek Township will vote again on November 4, 2008 on whether to create a merger study commission.
There were 2,596 households out of which 39.8% had children under the age of 18 living with them, 68.0% were married couples living together, 7.0% had a female householder with no husband present, and 22.1% were non-families. 18.8% of all households were made up of individuals and 5.9% had someone living alone who was 65 years of age or older. The average household size was 2.70 and the average family size was 3.11.
In the city the population was spread out with 28.0% under the age of 18, 6.6% from 18 to 24, 31.4% from 25 to 44, 24.7% from 45 to 64, and 9.2% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 97.9 males. For every 100 females age 18 and over, there were 95.9 males.
The median income for a household in the city was $62,794, and the median income for a family was $69,770. Males had a median income of $51,311 versus $35,184 for females. The per capita income for the city was $26,183. About 1.7% of families and 2.3% of the population were below the poverty line, including 2.8% of those under age 18 and 4.5% of those age 65 or over.
The government boasts that it is one of five cities in Ohio with no personal income tax. In addition, the city has never raised property taxes above their 1981 levels nor does it carry any general obligation debt. However, it should be noted that various entities such the school board and the local police and fire departments have increased property taxes to fund their services.
Bellbrook is served by a branch of the Greene County Public Library called Winters-Bellbrook Community Library.