My only problem with 9 digit zip codes is that I have no idea what mine is. I know the first 5 but not the last 4. If you have multiple addresses or move around

My only problem with 9 digit zip codes is that I have no idea what mine is. I know the first 5 but not the last 4. If you have multiple addresses or move around a lot its not something you are quick to remember, at least for me. I wonder how many people actually know their 9 digit zip.