Here are the country's top billionaires by net worth, according to Forbes. Tatiana Casiraghi Monaco is one of the few places on Earth where the wealthiest resident is a woman.
You can find the contact details for these billionaires on the Giving Pledge, most of these billionaires have written a letter to the organization and it has their address on the letter. Alternatively you could just Google the name and request contact details, for example you could search for Goerge Lucas Foundation Contact Details. You won't like my answer. But you need to hear it. I am a financial advisor to high-net-worth individuals, including two billionaires. One of my jobs is to prevent people “who really need help" from getting anywhere near my clients. A billionaire, in countries that use the short scale number naming system, is a person with a net worth of at least one billion (1,000,000,000, i.e. a thousand million) units of a given currency, usually major currencies such as the United States dollar, the euro or the pound sterling.