- Industrial Pretreatment Program
- Iniciativa de servicios para la juventud
- Instream Flow Program
- Integrated Pest Management Program
- Intergovernmental Affairs
- Investment and Grant Compliance
- Itinerant Merchant (Door to Door Sales) License
- Junior Ranger Program
- Kickball
- La Vida Mágica de los Árboles
- Land Acquisition Program
- Landlord, Tenant and Roommate Resources
- Landmark Alteration Certificate Application and Review
- Landmarks and Historic Districts
- Landscaping
- LGBTQ+ in Boulder
- Liquor Licenses
- List of Boulder Utilities
- Locate an Underground Utility
- Maps
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