Planthoppers from Malaise trap samples taken continuously over a 3 year period from 22 traps at 11 sites were investigated as a component of an ongoing all-taxon biotic inventory of the Great Smoky Mountains National Park. A cumulative species list for the Park from all sources of information was also compiled. The Malaise samples contained 2,195 specimens representing 55 species from 7 families. Elevational and seasonality patterns of planthoppers are presented. Species accumulation curves and 9 estimators of species richness predicted 57-81 species, which was higher than predicted our previous study (Bartlett & Bowman 2004), but less than the cumulative species total of 83 species when all sources of information are considered. Park species estimates between 77-103 were obtained by combining the Malaise trap sample data and Bartlett and Bowman’s (2004) sweep sample data, with 3 estimators remaining below the observed richness of 83 species for the Park. Implications of these findings are discussed.