Kumylzhenskaya is a rural locality located in Russia. It serves as the administrative center of the Kumylzhensky District within the Volgograd Oblast.
According to census data, the population of the settlement has fluctuated over recent decades. The 2010 census recorded a population of 7,953 residents, following a count of 8,043 in 2002 and 6,851 during the 1989 Soviet census.