International mail processing centers (IMPCs) are postal facilities that play a crucial role in inter-operator mail processing of Swiss Post, as they either form or receive items, or serve as transit centers for mail exchanged between other IMPCs. Each Swiss Post IMPC has a clearly defined physical location, is managed or under the responsibility of a postal service, and processes a specific set of mail flows both domestically and internationally. If you see the abbreviation "IMPC" in your parcel tracking and don't know where it is, you can search for the exact location in the list below.