Brooks, Kenedy, Willacy, Cameron, Starr, Ciudad Gustavo Diaz Ordaz (Mex), Matamoros (Mex), Reynosa (Mex), and Rio Bravo (Mex) Counties are the proud and cheerful neighbors of Hidalgo County. Lower Rio Grande Valley National Wildlife Refuge and Santa Ana National Wildlife Refuge represent the biggest natural treasures of this territory, reporting a population density of a bit less than 365 people per square mile. More than 70% of the workers in this land receive private wages, 20% has government salaries, and the remaining wages come from not incorporated and unpaid income.