Yes, most post offices in the United States are open on Saturday. But, and this is a big, juicy “but,” they usually operate on what I call “relaxed weekend hours.” Think of it like the post office wearing sweatpants—still professional, but definitely more chill than a Tuesday morning.
You’re usually looking at a 9:00 AM to 1:00 PM or 9:00 AM to 3:00 PM window. It’s not a full eight-hour day. It’s a “we’re here for your urgent stamp needs, but we’re also planning brunch” kind of vibe. Seriously, don’t show up at 4:30 PM expecting to buy a money order. That’s just cruel.