We discovered a previously unknown population of collared peccaries (Pecari tajacu) in Bastrop County, Texas (30.26245°N, 97.31024°W). Prior to this report, collared peccaries had been reported in western Texas and in the brush country south of San Antonio. There also are introduced populations in several counties in north-central Texas. The newly discovered population was in forests of post oak (Quercus stellata) and black jack oak (Q. marilandica), similar to the oak forest occupied by the population in Trans-Pecos Texas. Range extensions have been documented in northern New Mexico, western Texas, and eastern Texas. Whether or not the population in Bastrop County is an introduction or a range extension is unknown.