Three jurisdictions means three sets of pages, not one DMV page
The District, suburban Maryland and Northern Virginia are separate legal markets, and your site should read that way.
Most plumbing sites in this metro carry one service area page listing every town the trucks will drive to. It reads as a list of names. It ranks for almost nothing, and it tells a homeowner in Silver Spring nothing about whether you can pull a permit on their street.
Split it. One page for the District, one for Montgomery County, one for Arlington and Alexandria, each written by somebody who has actually worked there. Licensing, permitting and inspection generally differ across those lines, and any specific requirement is worth confirming with the relevant jurisdiction before you publish it.
The commercial benefit is plainer than the ranking benefit. A page that states which jurisdictions you actually cover stops generating inquiries you have to turn away, and turning away calls costs office time every week.
If you hold a license on only one side of the river, say so in a sentence. Honest coverage language converts better than a vague map that implies the whole DMV.