Leesville is an unincorporated city in the Gonzales-Guadalupe County area in Texas, United States. The community had a population of 384 residents as of 2018. The town was founded in 1874 and was named Leesburg for founder Newburn H. Guinn's daughter, Lee Guinn. The town was renamed Leesville by the U.S. Postal Service and was recognize…Leesville is an unincorporated city in the Gonzales-Guadalupe County area in Texas, United States. The community had a population of 384 residents as of 2018. The town was founded in 1874 and was named Leesburg for founder Newburn H. Guinn's daughter, Lee Guinn. The town was renamed Leesville by the U.S. Postal Service and was recognized by state law in 1891.