The Historical Statistics of the U.S.: Colonial Times to 1970 has recently been released as an electronic document. It's in PDF and not particularly convenient to use, but not impossible either. The Adobe find tool (binoculars) doesn't work and the page numbers of the book don't match the page numbers of the Adobe document. Still, I had some luck finding interesting facts using the subject index and patience.
| 1970 | 1900 | Source | |
|---|---|---|---|
| Population | 204,879,000 | 76,094,000 | Series A 23-28 Annual estimates of Population, p. 9 |
| Male | 100,266,000 | 38,867,000 | ditto |
| Female | 104,613,000 | 37,227,000 | ditto |
| Median age | 28.1 | 22.9 | Series A 143-157 Median Age of Population, p. 19 |
| Librarians | 124,000 | 3,000 | Series D 233-682 Detailed Occupation, p. 140 |
| Shoemakers | 32,000 | 102,000 | Series D 233-682 Detailed Occupation, p. 142 |
| Female workers | 30,601,000 | 5,319,000 | Series D 172-232 Major Occupation Group, p. 140 |
June 2004 July 2004 August 2004 September 2004 October 2004 November 2004 December 2004 January 2005 February 2005 March 2005 April 2005 May 2005 June 2005 July 2005 August 2005 September 2005 October 2005 November 2005 December 2005 January 2006 February 2006 March 2006 April 2006 May 2006 June 2006 July 2006 August 2006 September 2006 October 2006 November 2006 December 2006 January 2007 February 2007 March 2007 April 2007 May 2007
