900 Counties!

Route
US 501 North, US 360 East, VA 307 West, US 460 West, US 460 Business West, VA 45 North to Cumberland County and return, US 15/460 Business West, US 15 North to Buckingham County
US 15 South, US 15/360 Business Keysville, US 15 South, VA 49 South, NC 49 South, US 501 South
Notes
This was primarily a county tagging trip. The only odd thing I saw were the signs at US 360 and VA 360. The regular shields had banners for STATE and US above them, to make sure people would not be confused.
I had counted Lunenburg as having been visited by driving on I 85, but I 85 just misses the county. It appears that US 360 enters the county in the area around Meherrin, but here are no county signs on the highway. I saw some along side roads, so I ducked off on SR630 and found a sign and turned around.
Farmville was a good locus for visiting counties, there are four that I visited within ten miles of town.
Results
Clinched US 15/360 Business Keysville, US 58 Business Clarkesville, US 460 Business Farmville. Mileage on US 15, US 360, US 460, US 15 Business Farmville.
Counties in Virginia: Amelia, Buckingham, Cumberland, Lunenburg, Nottaway, Prince Edward. For a total of 901.