The balance includes the area of Davidson County that made up the City of Nashville prior to the 1963 merger with Davidson County as well as large areas of previously unincorporated land.
As of the 2000 census, the balance population was 545,524. The balance grew to 590,807 as of the census' 2007 estimates.
The Nashville-Davidson balance is centered at .
There were 227,403 households out of which 26.5% had children under the age of 18 living with them, 39.1% were married couples living together, 14.6% had a female householder with no husband present, and 42.3% were non-families. 33.8% of all households were made up of individuals and 8.2% had someone living alone who was 65 years of age or older. The average household size was 2.29 and the average family size was 2.96.
The age distribution was 22.1% under the age of 18, 11.9% from 18 to 24, 34.3% from 25 to 44, 20.8% from 45 to 64, and 11.0% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 93.8 males. For every 100 females age 18 and over, there were 90.8 males.
The median income for a household in the balance was $39,232, and the median income for a family was $48,448. Males had a median income of $33,114; versus $27,659 for females. The per capita income for the balance was $22,018. About 10.2% of families and 13.3% of the population were below the poverty line, including 19.5% of those under age 18 and 10.8% of those age 65 or over.