I'm not very familiar with data sources in the United States, but is it possible to find "standard" economic data, like household expenditures, average/median household income, average/median business spending, etc. by county for the time period 1900 - 1950? It doesn't have to be every year, but every 5-10 years would be helpful.
I saw this question that suggests the ACS and Decennial Census for more recent decades (like back to 1990), but I'm looking for historical data.