Abstract: This study explores the Impact of Urban Planning Policies on City Development. Urban planning policies significantly influence the development of cities, shaping their physical, social, economic, and environmental landscapes. These policies dictate how land is used, determining the distribution of residential, commercial, industrial, and recreational spaces, which in turn affects the overall functionality and livability of urban areas. Effective zoning laws ensure harmonious land use, reduce conflicts between different urban activities, and promote orderly growth. Transportation and infrastructure development, guided by urban planning policies, enhance connectivity, reduce congestion, and ensure the provision of essential services like water supply, energy distribution, and waste management. Housing policies, including inclusionary zoning, address issues of affordability and accessibility, fostering diverse and vibrant communities. Environmental sustainability is increasingly prioritized in urban planning, with policies promoting green spaces, sustainable building practices, and climate resilience. These initiatives contribute to reducing cities' environmental footprints and improving residents' quality of life. Economic development is also shaped by planning policies that create business districts, attract investment, and stimulate local economies, leading to job creation and increased prosperity.