THE DEVELOPMENT PRINCIPLES establish basic patterns that should guide future development in Marion. These principles are based on the city's special character, development patterns, and opportunities.

• A REGIONAL CITY OF 33,000. Marion should capitalize on its ability to attract growth and will achieve a target population of 33,000 by the year 2020.
• A UNIFIED COMMUNITY FRAMEWORK. Marion, through its plan, should adopt a framework of future streets and open spaces.
• URBAN GROWTH AREAS. Marion should establish policy areas to manage growth, including an area for present urban development, and areas reserved for future urban growth and open space and agricultural preservation.
• A GREENWAY SYSTEM. Marion should develop a greenway system that touches all parts of the city and is connected to major activity centers and attractions.
• TRANSPORTATION TO MEET CITY AND REGIONAL NEEDS. The transportation system should support development objectives of Marion as a growing city.
• EQUITABLY DISTRIBUTED AND FINANCED PUBLIC FACILITIES. Marion should develop a system to assure that quality public facilities are extended to development areas and are financed in proportion to benefit.
• A BALANCED COMMUNITY. Marion should accommodate diverse land uses and economic activities.
• A VITAL COMMUNITY CORE. Marion should encourage the emergence of its central corridor as a high-value, mixed use center.
• PRESERVATION OF HISTORIC MARION. Marion's historic built environment must be maintained and preserved.