JACKS BRANCH (Hill County). Jacks Branch rises four miles northwest of Hillsboro in central Hill County (at 32°04' N, 97°12' W) and runs south ten miles to its mouth on Aquilla Lake, four miles southwest of Hillsboro (at 31°57' N, 97°10' W). It traverses low-rolling to flat terrain surfaced by clay and sandy loams that support oak and juniper trees, scrub brush, and cacti. The area has served as range and crop land.