Annuaire Statistique HA 1213 .A4 Main and DMC (CD ROM of 2005 ed.)
Want to know how much, or how many? Population, education, employment, unemployment, trade, transportation, defense, deaths, etc. Annual volumes for each year 1918-1939.
Statistics Resources for the United Kingdom, Ireland, France, and Belgium, the section on France might be helpful.
Data and Statistics Research Guides might also be helpful.