Answer:
The first number in a United States ZIP code represents a geographical region of the country. The first digit is used to group large regions of the country into nine geographical divisions. These divisions are:
Northeast
Mid-Atlantic
South East
South
Midwest
Southwest
Rocky Mountains
Far West
Anywhere not listed above
The first digit of a ZIP code provides an overall understanding of the location's geography, which helps the US Postal Service route mail more efficiently. For example, a ZIP code beginning with 9 would be likely to be located on the West Coast, while a ZIP code starting with 3 would be more likely to be located in the Southeast.
Step-by-step explanation: