If you need a post office that's open late, this one is open the latest.\n\nCan't tell you how many times I've tried to find a post office that's open later than the one in my neighborhood until I discovered this one.  It's on Sunset, right across the street from McCarran Airport, is open till 9pm Monday-Friday and 4pm on Saturdays.  As much as I like my local office (Silverado) for convenience, this one seems to be the go to place if you don't want an overwhelmed staff and want to get in and out in a relatively efficient amount of time.  They also do passport stuff in case you need to get that taken care of.\n\nHowever, being the main post office in Las Vegas, it does have a big of a huge warehouse type feel to it.  Almost think the ambiance of a Costco with envelopes in place of food samples.  Also, despite the extended hours, the overnight shipping deadline is relatively early.  3:30pm.  I've been to other post offices where the deadline has been closer to 5pm... so that's something you gotta keep in mind.  Also, if you're coming from South Strip and/or the Henderson area, it's probably easier to access this place by heading north on Paradise.  It's right there on your right as the street ends rather than dealing with traffic on Sunset.