Start with ten broad first-digit regions, then reveal the first three digits used for sectional sorting areas, then zoom all the way into mapped five-digit ZIP Code Tabulation Areas.
Geographic detail
First-digit regions
Color shows the first digit; state outlines are reference only.
Preparing map detail…
Drag to pan · scroll to zoom · double-click to focus
0–9
Ten broad regions
Hover over the map to see a region. Click to hold a selection; use the detail buttons above to reveal ZIP3 and ZIP5 boundaries.
first digit→ZIP3→ZIP5
The first digit moves roughly east to west
The pattern follows postal operations, not clean political borders. Select a row to locate that region.