At least for USPS address specification the syntax is roughly: * The lowest line is the most coarse and sufficient to route to a major sorting facility. * The

At least for USPS address specification the syntax is roughly: * The lowest line is the most coarse and sufficient to route to a major sorting facility. * There's an implicit United States of America line under that, but International mail also uses the lowest line as major routing. (I guess customs I/O comes after that, and then it hits the foreign carrier if handing off.) * Physical location for a traditional address is the next 'line or two' above that. Usefully for a human holding a thing on a street (after sorting) the numeric address is first on that line set. Then the other bits of the address follow, usually a road designation or some zone thing; this line is little-endien first. * A building and/or person name are the top, often one line, sometimes two. This is probably why PlusCodes retains a short human friendly string specification for a major local marker. Like a city or major municipal facility that's unlikely to move over time. Effectively it's the same as that last line or two of USPS addresses. The + mark in the syntax is similar to a numeric decimal point, while also clearly breaking the major and minor flow elements.