Rousseau is an unincorporated community in Breathitt County, Kentucky. Rousseau is located on Kentucky Route 30, 8.9 miles (14.3 km) east-northeast of Jackson. Rousseau had a post office until it closed on January 3, 2004; it still has its own ZIP code, 41366.
A post office called Rousseau was established in 1882. The community has the name of a mill owner.