Las Vegas, often known simply as Vegas, is a city in and the county seat of San Miguel County, New Mexico, United States. Once two separat…Las Vegas, often known simply as Vegas, is a city in and the county seat of San Miguel County, New Mexico, United States. Once two separate municipalities, both were named Las Vegas: West Las Vegas and East Las Vegas. They are separated by the Gallinas River and retain distinct characters and separate, rival school districts. Las Vegas is home to New Mexico Highlands University, enrolling nearly 3,000 students.