Hawaii Incorporations Are Included Beginning With 1958. Alaska Incorporations Are Included Beginning With 1960. District Of Columbia Incorporations Are Included Beginning With 1963. Source: For 1945-1957 Data: Dun'S Statistical Review; For 1958-1969 Data: Business Trend, Monthly New Incorporations
This NBER data series m10090 appears on the NBER website in Chapter 10 at http://www.nber.org/databases/macrohistory/contents/chapter10.html.
NBER Indicator: m10090
Release: NBER Macrohistory Database
National Bureau of Economic Research, Number of Incorporations for United States [M10090USM479NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M10090USM479NNBR/, June 30, 2015.