The United States does not use the term "province" for its primary subnational divisions. That designation is found in countries like Canada, South Africa, and China. Instead, the U.S. employs a two-tier system:
There are 50 states, each with its own constitution, government, and considerable autonomy under the federal framework. States possess full legislative, executive, and judicial branches.
The U.S. also administers five permanently inhabited territories (Puerto Rico, Guam, U.S. Virgin Islands, American Samoa, Northern Mariana Islands) and several minor outlying islands. Territories have varying degrees of self-governance but lack full representation in Congress and cannot vote in presidential elections.
The term "province" typically implies a unitary state's administrative unit with less sovereignty than a U.S. state. The American federal model grants states reserved powers under the Tenth Amendment, making "state" the constitutionally correct term.
So, if you're looking for provinces in the U.S., you won't find any—only states, territories, and the federal district (Washington, D.C.).