Plovdiv municipal triangle of Plovdiv, including Maritsa municipality and Rodopi municipality. Population of Plovdiv: At the first census after the Liberation of Bulgaria in 1880 with 24,053 citizens, Plovdiv is the second largest city behind Ruse, which had 26,163 citizens then, and ahead of the capital Sofia, which had 20,501 citizens then. As of the 1887 census, Plovdiv was the largest city in the country for several years with 33,032 inhabitants compared to 30,428 for Sofia. According to the 1946 census, Plovdiv was the second largest city with 126,563 inhabitants compared to 487,000 for the capital. In its ethnic character Plovdiv
Plovdiv is the second or the third-largest cosmopolitan city inhabited by Bulgarians, after Sofia and possibly Varna. According to the 2001 census, out of a population of 338,224 inhabitants, the Bulgarians numbered 302,858 (90%). Stolipinovo in Plovdiv is the largest Roma neighbourhood in the Balkans, having a population of around 20,000 alone; further Roma ghettos are Hadji Hassan Mahala and Sheker Mahala. Therefore, the census number is a deflation of the number of Roma people, and they are most likely the second-largest group after the Bulgarians, most of all because the Muslim Roma in Plovdiv claim to be of Turkish ethnicity