The Lower Rio Grande Valley of Texas represents one of the most densely populated areas of southwestern United States. Its average density, 40.9 people per square mile, is nearly twice that for the state as a whole. The four counties of the Valley area include large tracts of nearly vacant ranch country. Were figures available for the irrigated area alone, the average density per square mile would be much greater.
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Foscue, Edwin J.
"The Distribution Of Population In The Lower Rio Grande Valley Of Texas,"
Field and Laboratory: Vol. 2
Available at: https://scholar.smu.edu/fieldandlab/vol2/iss2/2