Zapata County is on U.S. Highway 83 south of Laredo in the Rio Grande Plain region of South Texas. The county, named for local rancher Antonio Zapata is bordered on the north by Webb County, on the east by Jim Hogg and Starr counties, and on the west by Mexico. The center of the county is at 26°58' north latitude and 99°10' west longitude. The county's largest town and county seat is Zapata, which is on the Rio Grande at the junction of U.S. Highway 83 and State Highway 16. Other communities include San Ygnacio, Ramireño, Escobas, Falcon, and Lopeño. Zapata County covers 999 square miles, with elevations from 200 to 700 feet above sea level. The county generally has light-colored loamy soils over reddish or mottled clayey subsoils; limestone lies in places within forty inches of the surface. The flora includes thorny shrubs, grasses, mesquite, and cacti. Less than 1 percent of the county is considered prime farmland. Natural resources include caliche, clay, lignite coal, sand, gravel, oil, and gas. Crude oil production in 1990 was 445,503 barrels. Zapata County's climate is subtropical-subhumid. Temperatures range from an average of 44° F to 69° in January and 75° F to 100° in July. The average annual temperature is 74°. Rainfall averages nineteen inches a year, and the growing season lasts 295 days.

courtesy of:

Handbook of Texas Online, s.v. "," http://www.tshaonline.org/handbook/online/articles/ZZ/hcz1.html (accessed July 24, 2009).