Successful early intervention (EI) depends on the early detection of children who exhibit a delay in development or are at risk for developmental problems and providing these children and their families with timely integrated services delivered by social welfare, health, and educational professionals. To understand the difference in reporting rates among cities and counties, we analyzed registry data on the reported number of early intervention services (EISs) provided to developmentally delayed children from 2007 to 2012 published annually by the Department of Statistics, Ministry of the Interior. The information included the number of new cases reported each year according to the patients' ages at the time that the cases were reported, reporting area (city/county), gender, and ethnicity. The reporting rate in each city or county was estimated using the number of age-and ethnicity-specific children in each year in the database obtained from the Ministry of Interior as the denominator. The study was exempted from review by the Joint Institutional Review Board of Taipei Medical University. From 2007 to 2012, the national reporting rates increased yearly. The 6-year average reporting rates of most cities or counties did not deviate significantly from the national average rate. Compared with the rates observed in 2007, the reporting rates of nonaboriginal and aboriginal children increased by 2.59 per 1000 and 10.34 per 1000, respectively, in 2012. The annual national reporting rates for aboriginal children exceeded those for nonaboriginal children in 2008. The reporting rates of Nantou, Taitung, and Hualien Counties were persistently higher than those of other cities and counties. Previous studies have confirmed that EI is effective The best practice model for EIS entails collaboration among professionals and providing coaching services in a natural environment. The EIS-related health or educational resources of less urbanized areas are generally more limited. Our results indicated that the reporting rates of less urbanized areas were higher, suggesting that the government must establish teams of social welfare, health, and education professionals that deliver EISs in less urbanized areas, thus enabling developmentally delayed children in those areas to lead a normal life.