Sullivan City serves as a central hub in this borderland landscape, situated just north of the meandering Rio Grande. The area is characterized by a dense network of residential colonias and small settlements that follow the path of Old Military Rd and the primary highway corridor. These communities, including Saint Claire Fisher Colonia, La Hermosa Colonia, and Vales Colonia, illustrate the unique local pattern of rural development and neighborhood clustering along the Texas-Mexico border.
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1940 · Monte Christo
USGS Topo · 1:62,500
1949 · Mc Allen
USGS Topo · 1:250,000
1954 · McAllen
USGS Topo · 1:250,000
1956 · Garcias
USGS Topo · 1:62,500
1956 · Los Ebanos
USGS Topo · 1:62,500
1957 · Mc Allen
USGS Topo · 1:250,000
1962 · McAllen
USGS Topo · 1:250,000
1963 · La Joya
USGS Topo · 1:24,000
1963 · Citrus City
USGS Topo · 1:24,000
1963 · McCook
USGS Topo · 1:24,000