The driving distance is about 355 miles.
I 95
The driving distance from Toronto, ON, Canada to Washington, DC, USA is about 475mi / 765km
Google Maps estimates the driving time as 9 hours and 24 minutes.
I-95 TO 64 which will change to 60 I believe Comming from Northern Virginia (DC AREA)
Fasted - depending on conditions - will be on I-95 S at just under 14 hours.
Roughly 8 hours, and 440 miles. You can use mapquest.com to find directions more easily.
It depends on where in wyoming. search Google Maps driving directions "Washington, DC to Wyoming" gives 1823 miles
Flash
How much do greyhound tickets cost from Milwaukee Toronto
the flash
The driving distance from DC to the Delaware state line is about 77 road miles - roughly 2 hours of driving time.