Abstract: A study was carried out at Mountain Lake Biological Station in southwest Virginia to investigate the effect of edge habitat on intestinal parasitism rates in Peromyscus leucopus, white-footed mouse. It was hypothesized that fields would form a dispersal barrier to mice, and thus there would be a crowding effect at the edge. This would lead to higher egg burden in mice at the edge. We also hypothesized that edge dwelling mice would encounter more potential host species and would thus have a higher diversity of parasites as well. We did not find a crowding effect or more potential host species in edge habitat, and neither of our hypotheses was supported. We did find a trend of higher parasitism infection rates in edge habitat. This trend was largely due to Eimeria infection. The trend was confounded by our finding that significantly younger mice inhabit edge habitat. There was also a trend of younger mice having a higher infection rate. We discuss possible causes for these trends. We also suggest that edge mice are younger because juveniles are being displaced into this sub-optimal habitat, because densities were high in the summer of 2001.