The NBER-CES Manufacturing Industry Database contains annual data from the United States manufacturing sector for the period from 1958 to 2009. The data used for the development of the database come from various sources, but chiefly from four government agencies: the Bureau of the Census, the Bureau of Economic Analysis, the Bureau of Labor Statistics, and the Federal Reserve Board. The goal is to provide a long time-series of data for a large number of industries, adjusting for changes in industry definitions, and creating price deflators, capital stocks, and productivity estimates. This paper describes issues related to the most recent update of the database (1997 to 2009). For a more detailed discussion of an older version of the data see Bartelsman and Gray (1996). The key feature (and complication) of recent updates is the adjustment to the NAICS industry definitions. It is published in two versions: one based on the 1987 Standard Industrial Classification (SIC), containing 459 industries, and the other based on the 1997 North American Industrial Classification System (NAICS), containing 473 industries. The boundaries of the manufacturing sector shifted between SIC and NAICS, with some SIC industries leaving manufacturing and other NAICS industries entering manufacturing. The exiting SIC industries don't have data after 1996, and the entering NAICS industries don't have data before 1997. To enable the calculation of price deflators in each version, the benchmark year for deflators in the NAICS version is 1997, while the SIC version continues to use 1987 as a benchmark. This version of the database recalculates all the data post-1996, and earlier updates of the database (1958-2002 and 1958-2005) are superseded and should not be used. For more information, see methodology in http://www.nber.org/nberces/t0205.pdf, technical notes in http://www.nber.org/nberces/nberces5809/nberces_5809_technical_notes.pdf, information on Concordances (1987 SIC - 1997 NAICS in Stata, SAS, Excel, CSV, PDF, 1972 SIC - 1987 SIC in Stata, SAS, Excel, CSV, ).