In the 17th century, Pichilemu had 1,468 inhabitants. In 1787, Pichilemu had 1,688 inhabitants. In 1907, Pichilemu had 7,787 inhabitants. However, the city's population progressively decreased; in 1920, it was 7,424; in 1930, it was 6,929, and in 1940, it was 6,570. In 1952, the city's population increased to 7,150 inhabitants; in 1992, that figure had increased to 10,510. As of the 2002 census, 12,392 people live in the town. The census recorded that 9,459 people (76.3%) are from urban places of the city, and 2,933 people (23.7%) are from rural places of the city, there are 6,440 (52.0%) men and 5,952 (48.0%) women. The area of Pichilemu is . According to the CASEN 2002 census, 544 inhabitants (4.4%) of the population of Pichilemu live in extreme poverty compared to the average in the greater Region of O'Higgins of 4.5%, and 1,946 inhabitants (15.7%) live in mild poverty, compared to the regional average of 16.1%.