1. Start with the geography your firm actually serves
Chantilly is a census-designated place in Virginia, recorded in Fairfax County. Those are different geographic decisions, and attribution should not collapse them into one label.
Recommended approach
Define the geographic fields that matter to your intake and reporting. Decide whether “Chantilly” should identify a client location, a page viewed, an office market, a matter location or a service area. Review those definitions before comparing channels or pages.
