What is the population a territory needs to become state?

The US territories of Puerto Rico, the US Virgin Islands, Guam, and the Northern Mariana Islands are still US territories with no congressional representation and they require congressional action through federal enabling legislation or a constitutional amendment and a referendum for a change of status to either become states or to obtain their independence. For instance, Hawaii became a state by first adopting a state constitution. Then 93.2% of Hawaiians voters opted for statehood during a referendum. Afterwards, on March 7, 1959, President Dwight D. Eisenhower and a joint session of Congress signed Enabling Act 327 and Admission Act 34 to admit the formerly unorganized incorporated US territory to the union as the 50th state. Similarly, Alaska went through similar processes but as the 49th state.

Since there is so much ambiguity on how an existing US territory can legally become a state of the union a specific population for such territory to achieve the statehood status has not been established.