5
Eleven states have exactly eight letters in their names.
Six states have five or less letters in their name. Iowa, Ohio and Utah have four letters in their name. Idaho, Maine and Texas have five letters in their name.
Idaho, Maine, Texas.
47, all of them except Iowa, Ohio, and Utah. If you mean how many have exactly 5 letters in their names, then it is 3: Idaho, Maine, and Texas.
There are many listed holidays which are recognized in the United States. However, there are not listed holidays with five letters. The closest located is D-Day.
Alaska, Hawaii, Oregon, Kansas, Nevada
47, all of them except Iowa, Ohio, and Utah. If you mean how many have exactly 5 letters in their names, then it is 3: Idaho, Maine, and Texas.
There are exactly 42 Incan letters.
There are three months that have five letters in their names: March, April, and May.
Five
Exactly 6.
It depends on how many letters are in the username and if double letters are allowed.