Rzhaksa is an urban locality situated in the Rzhaksinsky District of Tambov Oblast, Russia. It serves as a populated settlement within the region's administrative framework.
According to census data, the population of Rzhaksa has shown a gradual decline over several decades. The 1989 Soviet census recorded 6,164 residents, while the 2002 census reported 5,864 people. By the 2010 census, the population was recorded at 5,196.