Willow Spring (or Willow Springs) is an unincorporated community in southeastern Wake, and western Johnston counties, North Carolina, United States, which is covered by a shared post office.[1] As of 2014, the population was 15,768.[2] The Frank and Mary Smith House and Turner and Amelia Smith House, both listed on the National Register of Historic Places, are located in Willow Spring. Black Creek, part of the Neuse River, runs through Willow Spring. There are wetlands such as swamp and marsh surrounding the creek.