Adelfas

Adelfas is an administrative neighborhood () in Madrid of the Retiro district. . It is located in the extreme south of the district, so it only delimits with 3 of the 5 neighborhoods of the district: Pacífico to the west, Niño Jesús to the east and Estrella to the northeast. It is a middle class neighborhood, and it is also the neighborhood of the district with the newest architecture. This neighborhood was formerly known as "Las Californias". This name is attributed to the homonymous street that was the backbone of neighborhood.

== Demography == It has a population of 12,105 as of January 1, 2006 . The evolution of demographics in the neighborhood has experienced a great increase over the last 20 years. Thus in 1986 the population of the neighborhood was 12,105, in 1991 it was 13,068, in 1996 it was 12,629 and in 2001 it was 14,453. Therefore, if we take the 1986 population as a reference, it has increased by 38%, while the population of the City of Madrid, in the same period, has only grown by 4.8%. In 2020, the population is 18,886. {| class="wikitable mw-collapsible" !Year !Population !Population evolution |- |1986 |12,105 |100 |- |1991 |13,068 |108.0 |- |1996 |12,629 |104.3 |- |1998 |12,877 |106.4 |- |1999 |12,940 |106.9 |- |2000 |13,414 |110.8 |- |2001 |14,453 |119.4 |- |2002 |15,208 |125.6 |- |2003 |16,149 |133.4 |- |2004 |16,260 |134.3 |- |2005 |16,408 |135.5 |- |2006 |16,705 |138.0 |- |2020 |18,886 | |} The average age of the neighborhood is 41.12 years. Despite being an age not much lower than the average for the city (42.00 years), it is the lowest in a district characterized by its aging since the average age of the district is 43.88 years.