Abstract: In recent years, the hierarchical scale structure of urban development in China has undergone dramatic restructuring, prominently characterized by metropolitan areas and urban agglomerations, centered around core cities, increasingly becoming the main forms of urbanization. This indicates that the changes in the urban system reflect a spatial concentration tendency favoring large cities. As the fundamental component of the new urbanization spatial pattern, county-level areas are vast and numerous but have not received sufficient research attention within the new development framework. This study selects 1,853 county-level areas as research objects, combining the scope of 19 urban agglomerations and 36 metropolitan areas outlined in existing plans and research. It analyzes the impact of core cities on counties in different locations, identifying three types: counties radiated by major cities, counties in potential areas of urban agglomerations, and counties in gaps within urban agglomerations. The study analyzes the urbanization patterns of Chinese counties through the perspective of urban agglomeration organization. Using data from the Seventh National Census and related public datasets, and applying weights determined by the entropy method, the study measures the comprehensive urbanization level of county-level areas in China based on four dimensions: population, economy, society, and land. It concludes by summarizing the current spatial pattern characteristics of county-level urbanization and provides policy recommendations for future county-level planning practices.