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Addressing and Premise Identification

Addressing and premise identification are an integral part of an emergency response system, allowing responders to efficiently respond to all types of emergencies without delay. The following information details how properties and buildings are addressed and provides instructions for the installation of address and premise identification.


2019 Oregon Fire Code (OFC) §505.1 as amended by the City of Hillsboro HMC 11.28.010, and City of Hillsboro HMC 11.32.050 and HMC 9.28


Complex: Three or more buildings on a single parcel.
Complex Map: A visual representation of a complex in plan view denoting the location of buildings, building designations, access roadways, and other features required by the fire code official.  
Flag Lot: A lot so shaped that the buildable area (the “flag”) is not adjacent to the street or alley on which the lot fronts, and which includes a private access strip (the “pole”) connecting the buildable area to the street or alley.  
Garden-Style Apartments: An apartment complex with a cluster of low-rise buildings, usually no more than three stories high with open stairwells, surrounded by landscaping, surface parking lots, and internal private access roads. 
Monument Sign: Permanently installed sign visible to the public that provides addressing and premise identification as required by the fire code official.

Address Designation/Assignment

Properties within the City of Hillsboro city limits are assigned an address by Hillsboro Planning Department using a standard method.  No person may use a number other than the one assigned by the Planning Department. The City of Hillsboro does not assign ZIP codes, which are assigned by the United States Postal Service. (HMC 9.28.020)

  • The City of Hillsboro uses an street grid, which originates at 1st Avenue and Main Street in Downtown Hillsboro with four quadrants with the following prefixes: 
    • NE - north of Main Street and east of 1st Avenue
    • NW - north of Main Street and west of 1st Avenue
    • SE - south of Main Street and east of 1st Avenue
    • SW - south of Main Street and west of 1st Avenue
  • There are additional prefixes unique to Main Street and 1st Avenue and include:
    • N and S - north and south of Main Street on 1st Avenue
    • E and W - east and west of 1st Avenue
  •  Address numbers are assigned sequentially in conformity with the existing pattern established by the street grid beginning with the number 100.
  • Even numbers are assigned on the east side of each north-south street and on the south side of each east-west street with odd numbers assigned on the opposite sides of each.  
  • Addresses are issued based on the primary street access point (front door/main entrance, primary vehicle access)

Complex Addressing

  • Each building will have at least one unique address number.  Buildings may be issued additional address numbers if there are ground level exterior doors for multiple tenants.  
  • Where there are multiple buildings accessed from an internal drive aisle, addresses are issued in a sequential clockwise or counter clockwise direction, making a loop from the entry to the exit.

Suite/Unit Addressing

  • Suite/unit address numbers are assigned and issued by Hillsboro Planning Department. Do not self-assign or relocate suite/unit numbers.
  • Suites/units with a direct external access are issued a unique address number.
  • Suites/unites with internal access only are issued a suite/unit number based on the floor level.  First floor suites/units are issued a 100 series number, second floor suites/units are issued a 200 series number and so on, excluding garden-style apartments (see below). The suite/unit numbers will stack on each other such that suite/unit 101 is below suite/unit 201, which is below suite/unit 301 and so on. 
  • Garden style apartments are issued unit numbers based on the building number (not assigned address number), floor level, and unit number.  The unit number is always a two-digit number and a 0 is used where the unit number is under 10. For example, Unit 1304 would be located in Building 1, on the third floor and would be the fourth unit on the floor. Unit addresses will be applied consistently to all buildings within the complex.
  • Suite letters are no longer assigned, but may be preexisting.

General Requirements

All premises shall have approved address numbers, building numbers, unit/suite designations or other approved identification placed so as to be plainly legible from the street or road fronting the property.

  • Be made so as to contrast with its background.    
  • Be composed of Arabic numbers or alphabetical letters.
  • Be positioned at a minimum of 80 inches above grade.
  • Be internally or externally illuminated at night an intensity of not less than 5.0 foot-candles.




General  6 inches  1 inch
Greater than 50 feet from right-of-way  12 inches  2 inches
One- and two-family dwelling  4 inches  0.5 inch
Range of building address numbers  12 inches  2 inches
Suite   6 inches  1 inch

Monuments, Poles or Signs

If access is via private road and the building cannot be easily seen from the public right-of-way, a monument, pole or other sign shall be used to identify the structure.

Buildings with multiple addresses and suites shall provide a monument at the primary entrance with additional signage on each building indicating the address range of the building and the location of each suite.

ComplexesPremise Identification Sign

A premise map shall be installed at the primary vehicle entrance into the complex. The address of the complex and each building shall be noted on this map at a minimum.

Timing of Installation

Address numbers shall be installed prior to occupancy of any new or existing building.

Construction Sites

Address signage shall be provided at each entrance to the site. If there are multiple buildings being constructed, a temporary premise map showing the location and designation of each building shall also be provided. All signage shall be of an approved size, be weather resistant, and be maintained until replaced by permanent signage.