Las Vegas has long been one of the fastest-growing cities in the country. As the desert metropolis has expanded, so too have a bevy of valley-based businesses that have experienced rapid growth in recent years, including WOW Carwash, Capriotti’s Sandwich Shop and Goodwrx. Those are three of the top 20 fastest-growing companies in Las Vegas, according to a list compiled by Growjo.com, a data-driven platform that tracks private companies and startups with 15 to 1,000 employees. “I felt like there was a lack of sources tracking the truly fastest-growing companies,” Growjo.com founder Tom Blue told VegasBusiness. “I would see articles and sites about specific tech companies that were well funded, but that misses the mark for companies that are growing revenue and the number of employees the fastest.” Blue said the site uses several factors to rank the fastest-growing companies.…