While those four are, indeed, commonwealths, with respect to the U.S. Constitution they have equal status with every other state, they enjoy all the constitutional privileges of statehood, and they bear all of the constitutional responsibilities of statehood.
Massachusetts, Pennsylvania, Virginia, and Kentucky are the four commonwealths of the US.
Kentucky, Massachusetts, Pennsylvania, Virginia
There are four "states" that are commonwealths. They are Kentucky, Massachusetts, Pennsylvania, and Virginia.
Kentucky, Massachusetts, Pennsylvania or Virginia
Four States of the United States of America style themselves Commonwealths:MassachusettsKentuckyVirginiaPennsylvaniaIn addition two dependencies of the US, Puerto Rico and the Northern Mariana Islands, style themselves commonwealths.
Four U.S. states call themselves commonwealth: Kentucky, Massachusetts, Pennsylvania, and Virginia.
Pennsylvania, Masschusetts, Virginia, and Kentucky sometimes refer to themselves as "Commonwealths". Pennsylvania, Massachusetts, Virginia, and Kentucky sometimes refer to themselves as "Commonwealths".
Massachusetts, Pennsylvania, Virginia, and Kentucky are the four commonwealths of the US.
Since you specified "4", I'm guessing you mean the Commonwealths of Massachusetts, Virginia, Pennsylvania and Kentucky. The term doesn't actually mean anything legally, it's just the official name of the state (instead of the more common "State of...").
Only four of the fifty states are Commonwealths: THey are: Kentucky, Massachusetts, Pennsylvania, and Virginia
36 states in the US are states, and 4 are officially commonwealths. (Pennsylvania, Massachusetts, Virginia, and Kentucky)
In the United States Massachusetts , Kentucky, Pennsylvania, and Virginia are styled commonwealths, not states, although functionally there is no difference. The United states also has two insular territories that are styled commonwealths. They are the Commonwealth of Puerto Rico and the Commonwealth of the Northern Marianas Islands..