The Harbor (sometimes called Hill Country Harbor) kicked off its initial sales phase in July 2007. About The Harbor. Quite a bit of the infrastructure is completed, some homes and condos are done, and people are moving in! FamilyHomePlans has been visited by 10K+ users in the past month View 565 homes for sale in Possum Kingdom Lake, TX at a median listing price of $469250. . Browse MLS listings in Possum Kingdom Lake and take real estate virtual tours at realtor®.