Code Postal is an independent French-language information website that helps users quickly find the postal code of a commune in France. It organizes information by region, department, and city, making it easier to explore postal codes alongside useful local details such as INSEE codes and population. The site explains how France’s five-digit postal code system works, including the role of the first two digits in identifying a department and the remaining digits in specifying a locality. It also describes the system’s introduction in 1965 to improve mail sorting and delivery.

Visitors can browse department and commune pages, consult regional listings, and learn about postal arrangements in different areas. The site notes that major cities such as Paris, Lyon, and Marseille use multiple postal codes, while some rural communities share a code. Its reference material draws on public sources including INSEE and La Poste. Code Postal presents itself as an independent project and states that it is not affiliated with La Poste.