Screen 993 US metros, 3,221 counties and 33,791 ZIPs on price-to-rent, cap rate, rent growth, affordability and inventory, then compare your finalists side by side. One finding: of the 743 metros where we hold both a typical home value and a typical rent, exactly 2 still clear the old 1% rule. Data from Zillow, Census, BLS, HUD, FHFA, Redfin and FEMA, credited on every page.