The population of Indonesia was 270.20 million according to the 2020 national census, an increase from 237.64 million in 2010. The official estimate as at mid 2022 was 275,773,800, increasing at a rate of 1.17% per year. Indonesia is the fourth most populous country in the world. Approximately 55% of Indonesia's population resides on Java, which is the most populous island in the world.

Java is one of the Greater Sunda Islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea to the north. With a population of 151.6 million people, Java is the world's most populous island, home to approximately 56% of the Indonesian population. Indonesia's capital city, Jakarta, is on Java's northwestern coast.