The population of Bulgaria was 6, 519,789 as of September 7, 2021. There are 3, 383, 527 women (51.9% of the population) and 3,136,262 men (48.1% of the population). There are 927 men per 1,000 women, the National Statistical Institute said.

Bulgaria's population has decreased by 11.5% or by 844,781 people in the past ten years. The depopulation is due to higher mortality and external migration. 23.5% of the population is aged 65 and above. More than 4 million people, 62.4% of the population, are aged 15 to 64.

There are 5,257 towns and villages. 4,782,064 people, or 73.3% of the population, live in 257 towns. 1,737,725 people, or 26.7% of the population live in 5,000 villages. There are six towns with a population above 100,000 persons- Sofia, Plovdiv, Varna, Burgas, Ruse and Stara Zagora. 34.5% of the country’s population lives in 6 towns.