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.
A ZIP code is a numbering system with separate code numbers for all cities in the United States. On April 30, 1963, Postmaster General John A. Gronouski announced that the ZIP Code would begin on July 1, 1963. The United States Post Office Department introduced the Zone Improvement Plan (ZIP) Code, a coding system that assigned codes on maps to all addresses in the country. In 1943 the United States Post Office Department divided cities into zones to assist in speeding sorting and mail delivery.