Its area spreads from Provadiya Municipality in the west to the Bulgarian Black Sea Coast in the east.

To the south the municipality is mostly defined by the Kamchiya river and its estuary.

It embraces a territory of 380 km2 (150 sq mi) with a population, as of December 2009, of 9,089 inhabitants.

[1] Avren Municipality includes the following 17 places, all of them are villages: The following table shows the change of the population during the last four decades.

According to the latest Bulgarian census of 2011, the religious composition, among those who answered the optional question on religious identification, was the following: A majority of the population of Avren Municipality identify themselves as Christians.