Vector-borne diseases, including those transmitted by ticks, pose serious public health threats to US military populations, as well as military and civilian populations in the Republic of Korea. (1) From 2004-2010, a total of 54,495 ticks belonging to three genera and eight species [Haemaphysalis longicornis (33,242; 61.0%), H. flava (18,525; 34.0%), Ixodes nipponensis (2,420; 4.4%), H. phasiana (216, 0.4%), H. japonica (33; <0.1%), Amblyomma testudinarium (26; <0.1%), I. turdus (17; <0.1%), and I. persulcatus(16; <0.1%)] were collected by tick drag. (2) As part of the rodent-borne disease surveillance program, a total of 6,773 ticks belonging to two genera and four species were collected from small mammals at US military installations and training sites in Korea from 2004-2009. (3) In collaboration with Seoul National University, a total of 920 ticks, belonging to two genera and six species were collected from small-large mammals. (4) In addition, a total of 250 ticks belonging to two genera and five species were collected from migratory birds. (5) I. simplex and I. vespertilionis also were collected from limited numbers of bats. Additional collections from small-large mammals, migratory birds, bats, and other animals are needed to identify the geographical and host range of ticks and the associated pathogens they harbor. Furthermore, these data can be used to provide predictive emergence and distributions of ticks and their associated pathogens.