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Three-Mile Plans

In 1987, state legislature made changes to annexation law limiting municipal annexations to no more than three miles beyond the current municipal boundary in any given year.  Further, municipalities in Colorado are required to prepare and adopt a three-mile plan prior to annexing property into their territorial boundaries per C.R.S. 31-12-105 et. seq.  The three-mile plan is a long-range plan that outlines where municipalities intend to annex property and describes how they will ensure the adequate provision of services within the newly annexed territory and the remainder of the existing municipality.

Sample Three-mile Plans


City of Castle Pines

City of Colorado Springs

Town of Frisco

Town of Hayden

City of Idaho Springs

Town of Minturn 

Town of Pagosa Springs

Town of Rico

City of Wheat Ridge


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