Río Chico Department is a department in Santa Cruz Province, Argentina. It has a population of 2,926 and an area of 34,262 km². The seat of t…Río Chico Department is a department in Santa Cruz Province, Argentina. It has a population of 2,926 and an area of 34,262 km². The seat of the department is in Gobernador Gregores. According to a June 2008 estimate from INDEC the population of the department is 3,107.