Biggest tax haven in U.S.? South Dakota, says Pandora Papers investigation

[underpants]

3. Wilmington Delaware has 1209 North Orange Street

Many companies are incorporated in Delaware for its business-friendly General Corporation Law. It was estimated in 2012 that $9.5 billion of potential taxes had not been levied over the past decade, due to an arrangement known as the "Delaware loophole."[2] Companies formed in Delaware are required to have an address in the state at which process may be served. Therefore, Delaware entities with no physical office in the state must have a registered agent with a Delaware address. Notable companies represented by CT at this location include Google, American Airlines, Apple Inc., General Motors, The Coca-Cola Company, Walmart, Yum! Brands, Verizon, and about 430 of Deutsche Bank's more than 2,000 subsidiary companies and special purpose companies.[3][4] Both former President of the United States Donald Trump, and his main opponent in the 2016 United States presidential election, Hillary Clinton, have registered companies at the center.[5]

https://en.wikipedia.org/wiki/Corporation_Trust_Center_(CT_Corporation)