A parcel's street address is its situs address (situs: n. the place where something exists or originates). Some parcels, particularly commercial parcels, may have more than one situs address.
With one exception, Pima County Development Services is the addressing authority for all Pima County situs addresses. The exception is the Town of Marana that manages situs addresses within the Marana city limits. The Pima County Assessor's Office keeps track of the parcel owner's mailing address which may differ from the situs address if the owner gets his mail (property tax bills!) at another address. Also, the United States Postal Service (USPS), 911, fire departments, and others keep track of addresses for their own purposes, but they are not official addressing authorities.