Alamo ( AL-ə-moh), located in the Rio Grande Valley in what is nicknamed the "Land of Two Summers", is a city in the irrigated area of southern Hidalgo County, Texas, United States. Known as the "Refuge to the Valley", it is located in an area of abundant vegetable farming and citrus groves, and is a noted winter resort/retirement town near the Mexico-U.S. border. Alamo is one of the Rio Grande Valley's gateways to Mexico, via U.S. Route 281 and Nuevo Progreso, Tamaulipas, as well as a gateway to the Santa Ana National Wildlife Refuge. Alamo's population was 18,353 at the 2010 census and an estimated 19,910 in 2019.
Alamo was laid out in 1909, and named after the Alamo Mission in San Antonio.
Alamo is located in southern Hidalgo County at 26°11′6″N 98°7′4″W (26.185113, -98.117892). It is bordered to the west by the city of San Juan and to the east by the city of Donna.
According to the United States Census Bureau, Alamo has a total area of 7.1 square miles (18.4 km2), all land.
Alamo is part of the McAllen–Edinburg–Mission and Reynosa–McAllen metropolitan areas.
As of the census of 2000, 14,760 people, 4,621 households, and 3,826 families resided in the city. The population density was 2,580.8 people per square mile (996.3/km2). The 6,208 housing units averaged 1,085.5 per square mile (419.0/km2). The racial makeup of the city was 83.61% White (including Latinos who were born before the 1960s and were considered whites by law), 0.21% African American, 0.43% Native American, 0.09% Asian, 13.73% from other races, and 1.94% from two or more races.