One of the advantages for employees in a group health plan is the contribution most employers make toward the cost of the health coverage premium â in many cases, employers pay one-half or more of the monthly premium for an employee.
The basic format consists of five decimal numerical digits. An extended ZIP+4 code, introduced in 1983, includes the five digits of the ZIP code, a hyphen, and four additional digits that determine a more specific location within a given ZIP code. The USPS provides a free online lookup tool for ZIP codes.
If you notice, on PO Boxes, the 4 digit number is the last 4 numbers of a PO box. If your 4-digit number is 6123, then your next-door neighbor who gets his mail just after your stop is 6124. The first number is the route number (carrier number), the next 3 is the actual stop number.