Округ Кларк / Clark County = 1,375,765 человек
However, there is a fairly strong military presence, as well as SAP sites all around vegas, due to the presence of Tonopah Test Range, A51, and Nellis AFB among others. Nellis being home to the ABMS Battle Lab (Air Force's component for JADC2) and a huge hub for Cyber means that it sees a rapidly increasing amount of military, agency, and govcon activity.
So while i love the idea that NGC is in on the SI and gets local hunter support, i feel like FIRSTLIGHT would be all over that place now as well.
Vegas has different rules from most cities. It's one of the few cities where a Kindred with horrific Dementation or Repulsive-level deformities can walk around in broad starlight and people will just assume he's an eccentric homeless man, or a tout for a new horror-themed restaurant. He can also wear whatever he likes with no limitation placed on era or excess, as the casinos and hotels provide endless opportunities to pass off a tailcoat, a sword, or lorica segmentata as mere costume. For this reason, I want to propose two changes to your OP:
Keep it a Camarilla city. Since the Masquerade is so much easier to enforce here than in, say, the neighboring Phoenix, the most interesting power structure will be the one which wishes to turn its attention and resources toward enforcing the other Traditions more effectively. Surely the many Sabbat enclaves hiding out in the desert (their nearest base of operations being in Flagstaff) provide a unique challenge to this.
A heavier Low Clan presence than the usual, especially Malkavians and Nosferatu for the reasons above, but also Gangrel, because of the historic populations from the surrounding Hopi reservations.