what would be the correct term?

[Alpo]

The United States has a flag. It is a national flag, because the United States is a nation.

 

Florida has a flag. It is not a national flag because Florida is not a nation. Florida is a state, so it has a state flag.

 

I just saw a picture, and the caption said it was the Puerto Rican national flag.

 

 

Puerto Rico is not a nation, so it cannot have a national flag. It also is not a state, so it cannot have a state flag. It is a territory. So would that be the territorial flag?

[Cold Lake Kid, SASS # 51474]

Here in Canada, we have Provinces and Territories. Their flags are referred to as "Provincial" or "Territorial/Territory" flags as appropriate.

 

[Subdeacon Joe]

Officially,  it's The Commonwealth of Puerto Rico.  It's a US territory,  so that's the Territorial Flag or the Commonwealth Flag. 

 

Territorial Flag sounds better.