The US state of Oklahoma is unofficially known as the Sooner State. Areas of land were to be opened for settlers to lay claim to, however it was illegal for any potential settler to enter the area before it was open. Those who entered the area early were called "Sooners".
Missouri
Maine.
New Jersey
Minnesota
Minnesota.
Empire State
In the U.S., "The Sunshine State" is the official nickname of Florida. In Australia, "The Sunshine State" is the official nickname of Queensland.
Delaware
Washington has the nickname "Evergreen State"
the mountain state, probably due to the eastern part of the state being full of mountains
The state has that has the nickname peach state is Georgia. Georgia got its nickname because they plant lots of peaches every year.