A. Address Districts: There are four (4) address districts within Ada County: the Boise, Meridian, Eagle and Kuna districts. The official boundaries of each district are stored in the assessor's street name and address database.
B. Initial Points: Each address district has an initial point which designates the starting point of the district's address grid. Initial points for each district are located as follows:
1. Boise: The intersection of West Main Street, East Warm Springs Avenue and North First Street in Boise.
2. Eagle: Near the intersection of State Street and Eagle Road in Eagle.
3. Kuna: Near the intersection of East Avalon Street, North Linder Avenue and South Swan Falls Road in Kuna.
4. Meridian: The intersection of Franklin Road and Meridian Road in Meridian.
C. Address Grids: Each address district is divided into a grid which shall be used to assign addresses within the district. Each grid consists of grid blocks which generally align with the public land survey system (PLSS). For each PLSS section in the district there shall be sixteen (16) rows and sixteen (16) columns of grid blocks which are approximately three hundred thirty feet (330') square. Address numbering within a district shall begin at the district's initial point and shall increase in increments of one hundred (100) address numbers per grid block, expanding outward from the initial point.
D. Accessed By Approved Street Or Road: Addresses shall only be assigned when the structure or lot can be accessed by an approved public street or named private road that is recorded in the assessor's street name and address database.
E. Numbers Reserved: Address numbers shall be assigned in such a manner that adequate numbers are reserved for possible future development.
F. Numbers Only: Address numbers shall only contain numbers. Use of letters, fractions or hyphens is prohibited.
G. Address Number Parity: Address numbers located on the north and east sides of a street shall be even numbers. Address numbers located on the south and west sides of a street shall be odd numbers. The same parity shall be maintained along the entire length of the street regardless of changes in direction. For diagonal and meandering streets, parity shall be determined based on the predirectional of the street's name.
H. Structures: If a structure is located on a lot which fronts only one street, the structure shall be addressed to that street. If a structure is located on a lot which fronts multiple streets, the structure shall be addressed to the street where the main entrance of the structure faces unless, as determined by the county assessor, special circumstances exist where following this standard would negatively impact public safety or the delivery of public services.
I. Subdivision Lots: Addresses shall be assigned to all new subdivision lots based on the most likely location of a future structure's main entrance, as determined by the county assessor. This address may be changed at the time of construction, if necessary to comply with the requirements of this chapter. Unbuildable subdivision lots, such as landscape buffers and small common lots, are exempt from this requirement.
J. Unit Numbers: When a structure has individual units which require designation with separate addresses, unit numbers shall be assigned. First floor units shall be assigned 100-series numbers, second floor units shall be assigned 200-series numbers, and so on for each successive floor. Basement units shall be assigned 10-series numbers, and so on by floor.
K. Building Numbers: When a complex consisting of more than one structure has been assigned a single address, each individual building shall be assigned a letter.
L. Cul-De-Sacs: For cul-de-sacs over one hundred feet (100') in length, parity shall be maintained along the length of the street with the odd and even numbering meeting at the midpoint of the back of the cul-de-sac or as close to the midpoint as possible (see figure below). For cul-de-sacs under one hundred feet (100'), the cul-de-sac street shall be considered part of the principal street from which it emerged and shall be addressed according to the address numbering sequence and parity of the principal street.
M. Circular Streets: The same address parity shall be maintained along the entire length of a circular street. Parity shall be determined by considering the appropriate address numbering of the street if it were laid out in a straight line along the direction of its predirectional.
N. Mobile Home Parks/Private Campuses: Mobile home parks and private campuses shall be assigned a single address along the street where the driveway access is located. Then, for mobile home parks each space shall be assigned a space number, for private campuses each building shall be assigned a building number. (Ord. 853, 3-22-2016)