Madison County Airport Affected Area Information

• Airport Affected Area Regulations (PDF)
• Airport Affected Area Permit Form (PDF)
• Map of Twin Bridges Airport Affected Area (PDF)
• Map of Ennis Big Sky Airport Affected Area (PDF)

ROAD STANDARDS

• Road Standards

Subdivision Regulations

• Madison County Subdivision Regulations (1-2025)
• 2024 Updated Environmental Assessment

Madison County Growth Policy

• 2025 Madison County Growth Policy

Additional Resources

• Big Hole River Conservation Development (Ordinance 1-2004 (PDF))
• Code of the New West (PDF)
• 2025 Housing Action Plan
• 2023 Housing Needs Assessment - Housing Board
• Commissioner District Map 2023 - Redistricting Map
• Planning Board Application