I worked for the USPS in both PA and upstate NY. I interviewed for one position in PA and another in NY, which turned into another because a couple of postmasters really wanted me for my past experience. The interview process is fairly simple and straightforward. Often, there's desperation around the holidays, so you need only have a pulse. You can dress top-notch or you'll see people there who clearly don't care and know the process in their jeans and sneakers. I'd look the part... if you want to be a mail carrier forever you need not get too fancy. If you want to give the impression you intend to move up, dress accordingly. Depending on the facility, you may set an appointment, show up, and it'll be one-on-one at that time, OR if you're unfortunate enough to have a group interview, you'll show up at the same time as 10-15 others with the same appointment, and wait in line for what will take hours. The interview itself is pretty straightforward with questions about whether you'd report someone for stealing the mail, how would you handle an upset customer, vicious dogs, times you struggled/persevered, etc. Be cautious of the desperate postmasters. Many are fine and decent people, but they will blatantly lie and tell you what you want to hear or fallacies. If you're applying to multiple offices, they will try to lure you with promises of an advanced place on the list to become a permanent employee. In the case of a rural carrier, you may hear you'll never have to use your personal vehicle and find out later that's all you'll use. Do your homework and keep an open mind that what you hear may not reflect what you will actually experience, be prepared for anything. It is a great job, but you have to have thick skin. You're always going to have customers that call and think you're stealing mail. You could be the fastest in your office and you'll tick off the folks you work with. You could take every extra route and OT and it'll never be good enough and is quickly forgotten if you ever say no. Show up on time, do your job, listen to your coworkers to read the vibe of the place, and don't take the postmasters too personally. They're good people and went through the same stuff you will, but they have people above them too giving them an even harder time.