Mr.V says on 15/Feb/11
Here's a clip of "Man Hunt" where George appears next to 6'2.5 listed Walter Pidgeon .

Click Here

The two are in front of each other from 7.50 to the end of the video . Sanders looks a good inch taller than Pidgeon to me . I'd say it is more likely than George was 6'3.5 rather than 6'2.5 . He was also pretty much the same height as John Wayne in "Allegheny Uprising" .

Mr. Kaplan says on 6/Feb/11
Same height as Joel McCrea in "Foreign Correspondent". They were either 6'2.5" or 6'3".

Shadow2 says on 25/Dec/10
George was consistently 1.5" to 2" taller than Stewart Granger in an early 1950's movie they appeared in. Granger was close to 6'1.5", and used lifts to be 6'3" in certain movies. George was easily a min 6'3", and looked it in all his work.