Las Lomitas is a city in northern Argentina. It is located in the Patiño Department in the center of Formosa Province. It has a population of …Las Lomitas is a city in northern Argentina. It is located in the Patiño Department in the center of Formosa Province. It has a population of 12,399 inhabitants as of the 2010 census. This represented a 20% increase in the population compared to the 2001 census which only had 10,354 inhabitants.