The thing that confused the hell out of me about US addresses when I first visited in 2014 was that the building numbers seemed random and were unnaturally large. As in, how the hell is it possible that I walked only a block but the number has increased by 100. Had to google it. It turns out you have an interesting system where each block is given a range of 100 numbers and they're interpolated. Makes it incredibly easy to navigate American cities once you understand this.