The Department of the Treasury has four functions these are economic, financial, tax and fiscal policies. 

It’s agencies include the US Mint, Financial Crimes Enforcement Network, Engraving and Printing and more.

It’s mission statement is: “Maintain a strong economy and create economic and job opportunities by promoting the conditions that enable economic growth and stability at home and abroad, strengthen national security by combating threats and protecting the integrity of the financial system, and manage the U.S. Government’s finances and resources effectively.”

The spreadsheet with contact details can be accessed and downloaded here.