If you don't mind, which metro area is this? I have an interest in street grids and address numbering systems; this just sounded like a peculiarity I'd like to read up on.
FYI, I went to college in the 90s with a kid that lived in a rural area in a very low population county in Indiana (one stop light in the entire county). His house still had the old rural route addressing (your address was the box where you received mail - potentially miles away - and not a street address as commonly understood https://pe.usps.com/text/pub28/28c2_021.htm).