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.
The ZIP Code program expanded the code to 5 digits and extended it nationwide. Implemented by the U.S. Post Office Department in 1963, the ZIP Code uses a 5-digit code to identify the individual community post offices or, in large urban areas with multiple post offices, delivery stations in metropolitan areas associated with a given address.