State Fire
154.280 is definitely "State Fire".
But it doesn't work like you may think. It's not like there's a state agency that broadcasts to fire units or fire departments. Also local dispatch centers don't usually use this frequency either.
"State Fire" should be called "state fireground" or "state fire mutual aid". What it really is -- is a channel for fire departments to talk to each other, usually at a fire scene. Especially if the fire units are from different counties, or even different states, they may not have a frequency in common. So "State Fire" is used on the scene.
This is not a repeater frequency, so the only way you would hear it is if you are within a short distance of the actual fire scene. It is normally used by walkie-talkies, limiting the range even more.
It's a very useful frequency to know, but is seldom useful if you're not at the fire.
Other states have the same thing. In Minnesota for instance, it's 154.295.