Objectives : The purpose of the study is to compare and investigate oral health status between Korean adults living in Korea and the US. Methods : Subjects were 1,785 persons including 399 Korean adults living in Virginia, US and those from the second year 2011 of the 5th National Health and Nutrition Survey. Darta were analyzed using SPSS 12.0 for frequency analysis, t-test, one-way ANOVA, and post-hoc Tukey. Results : 1. In general characteristics, adult living in Korea revealed higher DT and DMFT than those in the US. 2. In oral health status, adult living in Korea revealed higher DT and DMFT than those in the US. 3. The variables affecting oral health status in Korean adults in the US were age, private health insurance and number of tooth brushing. 4. The variables affecting oral health status in adults in Korea included gender, age, private health insurance, smoking, drinking, use of secondary oral hygienic products and number of tooth brushing. Conclusions : It is necessary to emphasize the importance of oral health care and to establish the oral health education in dental care agencies.