This map of the United States divides the country into ZIP code zones. All states with a common colour use ZIP codes starting with the same digit. Each string of digits, whether two or three digits in length, refers to an allocation which reflects all existing ZIP codes starting with those two or three digits.
Nederlands: ZIP code gebieden in de Verenigde Staten
中文 : 圖示美國各州的郵區編號，字頭相同的州份會以相同顏色表示。
Own work, based on Image:ZIP_code_zones.png
Denelson83