Boulder County COVID-19 status is at Level Orange: “High Risk.” Learn more in English and Spanish.

Sign up to be notified when COVID-19 vaccine becomes available for your priority group.

Mountain Addressing System

Mountain Addressing System

Mountain address map imageThe Boulder County Mountain Addressing System is based on a mile-point/street-name system designed to expedite emergency response.

A mountain address atlas of house locations has been issued to all Emergency Services Information and is periodically updated by the Sheriff’s Office. It is important that you clearly display the “green” address plate at your entrance. It is important that the county-assigned physical address number for the property be clearly visible from the front property entrance or driveway.

Your assigned address informs emergency and other services how far your driveway is from the starting point of your street. For example, 1138 Poorman Road is 1.138 miles up Poorman Road from Sunshine Canyon Drive. Even numbers are on the right and odd numbers are on the left.

To have your property address assigned or verified, please contact Land Use via the Ask a Planner form, or call 303-441-3930.

Displaying Your Property Address or Boulder County Green Address Plate

In choosing the best place to display your address plate, please consider the direction from which ambulance and fire vehicles will be responding. Please install the plate where it is highly visible. Mountain address sign green

The address plate should withstand all weather conditions, and should be posted on a feature that will not readily burn. If a green address plate from Boulder County is being installed, then it is recommended that a flathead nail that is sufficiently smaller than the pre-drilled holes is used since the acrylic material has a tendency to expand and contract. Painting numbers on natural features such as rocks and trees is not permitted.

Obtaining County Address Identification Plates

To obtain the County green address plates, either contact your local fire chief or call Boulder County at 303-441-3930. Green address plates are provided to mountain properties located in unincorporated Boulder County free of charge by the County.

If you have any questions regarding the Mountain Addressing System, please contact Land Use via the Ask a Planner form, or call 303-441-3930.

Contact Us

Community Planning & Permitting (formerly the Land Use Dept.)

Email: Ask a Planner Form
Main: 303-441-3930

Courthouse Annex Building

2045 13th Street
Boulder, CO 80302
Map & Directions

Mailing Address

Community Planning & Permitting
PO Box 471
Boulder, CO 80306