Las Vegas, Nevada is one of the most populated casino cities in the world by number of casinos. As per the WorldCasinoDirectory, Las Vegas has 170+ casinos and 90+ casino hotels in the city. Whereas, Nevada as a whole has 404 licensed casinos and 178 casino hotels across 45 gambling cities in the state.
The biggest difference is size/area. Las Vegas is a sprawling, massive, non stop city. Even when it was a much smaller town- 30 - 40 years ago it was never as small as A.C. is. AC is no bigger now than it was 30 years agp- in fact, there are fewer casino properties now than than there were then.