Well as mentioned above, North Las Vegas is not the northern part of LV but an independent city. And in some areas, you have to look at the metro area vs. the city proper, and those can be hard to tell apart.
The Tenderloin is higher on property crimes, drugs, etc. You are less likely to wander into a driveby. It’s the only place where I’ve been involved in getting a car stolen. Although I don’t think it was parked in Tenderloin proper, but in SF that doesn’t matter, as you can walk two block and switch from good neighborhood to bad, and walk three more and you’re back in a decent neighborhood.