Clark County Nevada Map shows the county’s location, the county seat, neighbouring counties, the state capital, etc. Clark County is located in the southern tip of Nevada. Its total area is 8,061 sq mi (20,880 sq km), where 7,891 sq mi (20,440 sq km) land area and 169 sq mi (440 sq km) is water area. Las Vegas is the county seat and also the largest city.