These are very specific government agencies. This may be a place where regionally specific tags work best. Maybe pretty it up with a namespace.
office=goverment admin_level=4 office:type:california=DMV office=goverment admin_level=4 office:type:massachusetts=RMV name=Massachusetts Registry of Motor Vehicles There's a whole set of assumptions about each type of goverment office that would be impossible to consistently capture with generic tags. Here the "Duck" of duck typing says call it by whatever it is known locally.
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