- Merlo is a city located in the province of Buenos Aires, Argentina. It is part of the Greater Buenos Aires metropolitan area and is situated about 30 kilometers west of the capital city of Buenos Aires. Merlo has a population of approximately 500,000 people and is known for its historic sites, natural beauty, and cultural activities. The city offers various amenities and services to its residents, including schools, hospitals, shopping centers, and recreational areas. Merlo also has a strong sense of community and holds several festivals and events throughout the year.