Women with gestational diabetes mellitus (GDM) are at an increased risk of developing diabetes in the future, as are their offspring. GDM is not only of clinical relevance, but is also an important public health issue. A community-based prospective study showed that the prevalence of GDM was 13.9%. We also observed that the frequency of GDM varied across urban, semi-urban, and rural areas. Based on multiple logistic regression analysis and taking the 3 areas into consideration, family history of diabetes, age greater than or equal to 25 years, and body mass index greater than or equal to 25 were found to have a significant independent association with GDM (P<0.001).