Vehicles owned by a city or town, county or other local agency are licensed with Municipal plates in Indiana. Up until a few years ago, there were a variety of different plates that served this function, but it's simpler to just make one type, so here we are.
I created the image of the Municipal plate at left on my computer. It is pretty close to accurate (as far as I can remember), but as soon as I can get a better shot of one, I'll post that in its place. Oh, and if you click to see the image in full size, I have NO idea where the "horns" came from on the "M" in MUNICIPAL. The antiquated software I use sometimes does that.