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
•  Each north-south street will be designated with a number consistent with the city address grid, unless the grid cannot accommodate the necessary number, in which case a name may be substituted.
• Each east-west street will be designated with a street name approved by the City of Hillsboro.  
• 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)

Accessory Dwelling Unit (ADU) Addressing

• In most cases, ADUs are issued a separate address using the address of the primary residence with the addition of a Unit A designation. For example, if the primary is 1234 NE Main St, the ADU would be assigned 1234 NE Main St Unit A.   
• When an ADU is not physically accessible from the same street as the primary residence, the ADU would have a separate address with no Unit A designation. The ADU would be assigned an address based on the street or alley fronting the primary access to the ADU.   

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 (notassigned 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.

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.

Timing of Installation

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

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.  

Please show the location of monuments, poles, and signs on Public Infrastructure and Private Utility Permit plans for review by City staff. Monuments, poles, signs, and associated footings shall be outside the private utility easement. Additionally, monuments, poles, and signs shall be placed outside sight triangles. (City of Hillsboro Design and Construction Standard 130.B.5.A, 230.5.1)

Complexes

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.

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, be weather resistant, and be maintained until replaced by permanent signage.