<P> The Rio Grande Valley is an area located in the southernmost tip of South Texas . It lies along the northern bank of the Rio Grande river , which separates Mexico from the United States . The four - county region , consisting of Hidalgo , Cameron , Willacy , and Starr counties , is one of the fastest growing places in the United States . From having about 325,000 people in 1969 , to today a population over 1,300,000 in 2014 . Some of the biggest cities in the region are : Brownsville , Harlingen , Weslaco , Pharr , McAllen , Edinburg , Mission , Hidalgo , and Rio Grande City . </P>
<P> The Rio Grande Valley is an area located in the southernmost tip of South Texas . It lies along the northern bank of the Rio Grande river , which separates Mexico from the United States . The four - county region , consisting of Hidalgo , Cameron , Willacy , and Starr counties , is one of the fastest growing places in the United States . From having about 325,000 people in 1969 , to today a population over 1,300,000 in 2014 . Some of the biggest cities in the region are : Brownsville , Harlingen , Weslaco , Pharr , McAllen , Edinburg , Mission , Hidalgo , and Rio Grande City . </P>
how many counties make up the rio grande valley
how many counties make up the rio grande valley
Hidalgo Cameron Willacy Starr
Hidalgo Cameron Willacy Starr