Chattanooga Valley is a census-designated place (CDP) in Walker County, Georgia, United States. The population was 4,065 at the 2000 census. As of the census of 2000, there were 4,065 people, 1,588 households, and 1,225 families residing in the CDP. The population density was 208.2/km² (539.3/mi²). There were 1,698 housing units at an average density of 86.9/km² (225.3/mi²). The racial makeup of the CDP was 98.18% White, 0.54% African American, 0.30% Native American, 0.22% Asian, 0.32% from other races, and 0.44% from two or more races. Hispanic or Latino of any race were 0.69% of the population.

There were 1,588 households out of which 31.4% had children under the age of 18 living with them, 63.6% were married couples living together, 10.1% had a female householder with no husband present, and 22.8% were non-families. 20.4% of all households were made up of individuals and 9.3% had someone living alone who was 65 years of age or older. The average household size was 2.56 and the average family size was 2.93.