Say which side of the river you cover before the visitor has to guess
In a metro split across three jurisdictions, coverage is the first question in a buyer's head and most sites answer it last.
Someone in Silver Spring who cannot tell within a few seconds whether you work in Montgomery County will leave. So will someone in Old Town looking at a site that reads as District-only. The header and the first screen should carry the jurisdictions plainly, in words, not as a map graphic that fails on a phone.
Say it specifically. The District, Montgomery County, Prince George's, Arlington, Alexandria, Fairfax County. Naming places is more credible than saying you serve the DMV, and it filters out the inquiries you cannot take.
Put license numbers by jurisdiction in the footer and on a credentials page. Requirements differ across the three, and buyers here, many of whom evaluate vendors for a living, will look.
If your coverage has edges, publish them. A short line saying where you do not go saves your estimators more time than any lead magnet on the site.