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5.0 Property Numbering

5.1 General responsibility for property numbering.

The County Council and City Councils shall designate, within their jurisdictions and by ordinance, the public official who has the responsibility to calculate and assign official location addresses on both public and private streets. This includes all addresses for rights-of-way on recorded dedication plats, as well as existing rights-of-way, both public and private, and those numbers depicting sub-parcel, sub-structure identification. Private engineers, developers or other individuals shall not be allowed to assign location addresses

5.1.1 Registered certificates of location (situs) address.

All legal situs addresses, both public and private, shall be documented and registered with a certified number by the County and by all municipal governments, in their respective jurisdictions, when improvements to real parcels within the County are proposed, or when it is necessary to change addresses to eliminate confusion.

Recorded plats with approved and certified address information displayed are considered official certificates of legal situs addresses for the lots and units platted thereon.

5.1.2 Private numbering systems.

No private numbering systems shall be approved. All public and private location addresses which are in use within the boundaries of the county shall have official approved situs addresses issued with frontage numbers which reference the Countywide Grid System except as follows:

The frontage numbering system applied in adjacent canyons with public rights-of-way. Such systems shall be required to convert to the Countywide Grid System at such time that they incorporate, become annexed, or petition the County to effect such an action.

Numbering systems which exist in rural areas of the county not yet absorbed into the major urban expansion. These areas must have their address systems converted to the Countywide Grid System at the time they incorporate, are annexed, or become absorbed into the major urban growth of the county.

5.1.3 Odd and even numbering.

The assignment of frontage numbers in legal situs addresses shall be measured and uniformly consecutive with even numbers on the right side of the street and odd numbers on the left side of the street looking away towards the east, west, north, or south from the junction of the baseline and meridian streets. Alternatively, even numbers shall always be on the right side of the street and odd numbers on the left in the direction of increasing frontage intervals.

5.1.4 Coordination of frontage numbers and intersection coordinates.

All streets shall have frontage numbers that conform sequentially to their assigned intersection coordinates.

5.1.5 Directional determination.

On streets that are not aligned with any of the four compass directions, the direction assigned to the frontage numbers shall be from the compass direction which most nearly matches the bearing of the street.

5.1.6 Numerical freedom.

Numerical freedom shall be utilized to make use of additional property numbers in the interval between frontage numbers, providing such numbers are in consecutive sequence and are whole integers; they shall not be issued as fractions of numbers (e.g. 59 1/2 E 3900 S).

5.1.7 Juxtaposition.

Frontage numbers should be comparable (but not duplicated) on parallel streets and should be in consecutive order. Frontage numbers which would be divisible by 100 should be adjusted two digits (i.e. 3800 S should be 3798 S or 3802 S) to avoid identifying them with street numbers.

5.2 Methods of assigning property numbers.

5.2.1 Frontage number scales.

Because many numbering scales are used to calculate frontage numbers on the Countywide Grid System, the scale employed shall be indicated on all final plats. If a scale does not apply, a constant shall be used to determine the frontage numbers, which shall be indicated on the final plat.

5.2.2 Streets changing directions between intersections.

Streets which change direction between intersections, either at an oblique angle or to another axis of the Countywide Grid System, must have the directional and the frontage number changed to match the new bearing direction of the street.

If the directional change of the street results in the duplication of frontage number ranges, it should be renamed at the point where it shifts direction or at the nearest intersection that will avoid the range duplication.

If a street changes direction and is contained wholly within a subdivision or area, the frontage numbers may continue sequentially as in one direction, but it is still necessary to assign the proper coordinates at all intersections.

5.2.3 Diagonal streets.

Intersection numbers on diagonal cross streets shall be calculated to begin with the same number measured from the baseline or meridian streets according to the frontage number scale designated for that area; this will ensure that the frontage numbers are uniformly measured from one street to the next where they intersect the cross street.

When assigning frontage numbers to diagonal streets they must not be measured along the diagonal, instead, numbers along the diagonal shall be measured as true north-south and east-west distances from the dedicated reference streets to which the diagonal street intersects.

5.2.4 Numbering corner lots.

Proposed subdivision with corner lots should have frontage numbers calculated for both streets that the lot fronts upon and both frontage numbers placed on the final plats. Once the structure’s facing is identified, the correct frontage number can be selected and assigned.

5.2.5 Numbering cul-de-sac streets.

Cul-de-sac streets shall be measured and positioned on the Countywide Grid System such that frontage numbers are even on one side to a point approximately half way to the top of the turnaround and then are odd numbers back along the opposite side of the cul-de-sac.

5.2.6 Numbering private streets and rights-of-way.

Structures and dwellings fronting on private rights-of-way shall be assigned number addresses, using numerical freedom, which have frontage numbers referencing the frontage interval of the public street to which the private right-of-way intersects.

If a private right-of-way has a requirement for frontage numbers exceeding the available numbers in the frontage interval on the public street with which it intersects, the private street shall be assigned a name and placed on the Countywide Grid System. All structures and dwellings fronting upon the newly named private right-of-way shall be re-assigned legal situs addresses according to the standards set forth in this policy. This procedure may be done, without ordinance or petition, by the local government whose authority has been designated in that jurisdiction. A public hearing may be provided if an appeal is made by affected persons.

If a private right-of-way contains single family structures or other occupied structures which are numbered off the public street that the private right-of-way intersects, the residents may petition the county or city agency responsible for administering property to approve street name or numbering and place their private right-of-way on the Countywide Grid System.

5.2.7 Numbering duplexes, rear houses, and buildings on interior lots.

Where possible, numerical freedom in the interval between frontage numbers should be used for sub-parcel identification, instead of assigning fractions of numbers or the designation “front” or “rear,” to duplexes, rear houses and buildings on interior lots.

5.2.8 Numbering high density structures.

Condominiums and Planned Unit Developments with multiple levels should be numbered according to the standards set forth in this policy, unless the unit density dictates constraints, then the following shall apply as guidelines for assigning numbers:

Buildings with two or more levels above grade and internal stairwells should be addressed using the sub-structure suffix code for high rise structures.

Buildings with external stairwells should have each stairwell entrance assigned a unique frontage number if each entrance has units that are accessed solely through that stairwell. Assign each unit accessed by its entrance a unit number, indicating floor level, to be used as an address suffix (i.e. 239 E. Esker Ln. #10, #20, #30 – 1st, 2nd, & 3rd floors).

Sub-structure suffix numbers for units below grade should be designated with a letter indicating floor level below grade (e.g. -1st floor = A, -2nd floor = B, 3rd floor = C), followed with a unit number (e.g. #A 1).

Numbers are preferred over letters in designating units above grade.

Commercial strips should have each business unit assigned an address using a separate frontage number and the number or the alphabetic name for the street upon which the commercial structure fronts.

Commercial Malls, Centers, or Squares should have internal addressing which considers floor levels with a sub-structure suffix of three or more digits where the first digit represents the level above grade and the remaining digits represent the unit number. Addresses for these commercial structures may substitute the street name in the address format with a project name and substitute the street type designator with appropriate abbreviation of a standard structure type (i.e. 6945 S. Union Park Cntr. #101 – which is the first unit on the first floor). A single frontage number should be assigned for the entire commercial structures. Separate structures within a Mall or Center Complex may be assigned separate frontage numbers. Below grade levels should use a letter in the suffix.

High Rise Structures require a vertical sub-structure suffix to identify suites, rooms, premises, and occupancies or establishments that are accessible by the public via hallways and elevators. These vertical addresses should consist of the frontage number or use the project name as a prefix in the address. Subsequently the address suffix should consist of a four digit number with the first two digits representing the floor number above grade and the remaining two digits being a sequential identifier for all rooms, suites, or dwelling units starting from the left of a major stairwell or elevator shaft. Below grade levels should use a letter in the suffix.

Industrial parks generally have lower density than most retail or other commercial structures and should be identified through the regular procedures of numbering private streets set forth in these regulations.

5.3 Display of frontage numbers on buildings.


When a registered situs address has been designated by an authorized government agency, the owner or occupant or person in charge of the building or dwelling shall place, within a period of 10 days, a painted, carved or cast duplication of the frontage number in a conspicuous position upon the front of such dwelling or building. The number should be mounted in a permanent, stationary and durable manner, unobstructed at all times by vegetation, screens, or anything that would tend to hide or obscure the number. If the building is not visible from the street, a lawn stake or similar permanent fixture with the number shall be placed in a conspicuous place near the road or the number may be placed permanently on a curbside postal mail box.


Numbers which are mounted on dwellings and buildings shall be plain block numerals, not script or written numbers, and conform to the following minimum dimensions based upon the setback distance of the building from the street upon which the number must be viewed:

Setback Distance Height of Number
0-150 feet 3 inches
151-200 feet 5 inches
201-300 feet 8 inches
301 feet of greater 12 inches


The owner, occupant or person in charge of the building, upon affixing any new number, shall remove any different number which might be mistaken for or confused with the number assigned.


Each principal building shall display the assigned number on the side of the building where the front entrance is located. If a principal building is occupied by more than one business or family dwelling unit, any separate entrance to an occupied sub-structure unit shall display a separate number.


No building permit shall be issued for any principal building unit until the owner or developer has procured an official address for the premises from the government addressing agency in that jurisdiction. Final approval for the certificate of occupancy of any principal building shall not be issued until permanent and proper numbers have been displayed as provided above.