Editable Excel USA County Map

I need a single Microsoft Excel workbook that already contains a full, properly scaled map of the United States—every state, every county. Inside that file I want to be able to:

• Fill or change the color of any county so I can instantly show where each customer is located as we add new business.
• Add, remove, or recolor states automatically when several counties inside them are selected.
• Place one clearly visible annotation that identifies our main office; I should be able to move or rename that label myself.

My source data will arrive as standard .xls or .xlsx spreadsheets, so the map has to accept county names or FIPS codes from those sheets and update the colors with as little manual work as possible (a macro, Power Query, or any Excel-native method you prefer is fine).

Please deliver the finished, unlocked Excel file plus brief instructions that show me how to:
1. import a new customer list,
2. highlight the corresponding counties, and
3. change or move the main-office annotation.

If you’ve built similar interactive maps in Excel—especially ones driven by tables or dynamic ranges—let me see a sample screenshot or short video so I can gauge the usability.