About 500
It is about 40 miles closer to Williamsburg,
280 miles
It is 381.13 miles according to MapQuest.
I was unable to find any town in Maryland named Gettysburg. Gaithersburg is 60 miles from Gettysburg.
It is 810 miles according to Google Maps.
It is around a 300 mile trip by car between Gettysburg, PA and Cooperstown, NY.
about 950 miles
72 miles
The mileage from Houston to Gettysburg is only 1437.81 miles while the mileage to the more distant Philadelphia is 1,571.80 miles
It is 389 miles from Pittsburgh, PA to Williamsburg, VA. There is more than one route, but the primary one would be Interstates 70 and 95.
About 900 miles.
The distance according to MapQuest is 300.68 miles.