Linn County SO 5xx Identifier

[wcdg]

I know the Linn County Sheriff's Office shares dispatch between the Sheriff's Office with the unit identifier 7xx and the corrections office with the unit identifier of 6xx, but I've also been hearing the identifier 5xx which is not listed in the wiki.

Does anyone know what office this is?

 

[dkf435]

Have noticed the 500 numbers have been used by Corrections Deputies and I think their is a few from Search And Rescue using 500 numbers.

David