The Saint Louis Federal Reserve Bank uses the most recent Metropolitan Statistical Area definitions released by the Office of Management and Budget. For more information on specific definitions visit the Office of Management and Budget website at http://www.whitehouse.gov/omb/bulletins_default.
Source: US. Bureau of the Census
US. Bureau of the Census, New Private Housing Units Authorized By Building Permit for Austin-Round Rock, TX (MSA) [AUST448BPPRIV], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/AUST448BPPRIV/, July 7, 2015.