California possesses the highest total number of millionaires and high-net-worth households in the United States, largely driven by its massive population size and the immense wealth generated by the Silicon Valley technology sector, entertainment industries, and real estate markets. Following closely behind are other populous states like Texas and Florida, which also house large absolute numbers of affluent individuals, frequently aided by favorable state tax structures that attract wealthy retirees and business founders. When measured on a per-capita basis relative to population size, smaller and wealthier northeastern states like Newry, Connecticut, or Maryland often rank near the top for the highest concentration of millionaires per resident.