Las Vegas has been named the worst metropolitan area for affordable rental housing, and Nevada ranked last in 2018 among the states for at least the fourth year in a row. That’s from the annual report published by the National Low Income Housing Coalition, called “The Gap: A Shortage of Affordable Homes.” The study used census data from 2016 to identify rental housing that was both affordable and available for “Extremely low income” families. The federal government defines such families as making 30 percent or less of an area’s median income. The Las Vegas metro area had only 10 rental units for every 100 extremely low income households. Nevada had 15. The national average was 35.