When Mickey Mantle cleared the left-center-field bleachers at Clark Griffith Stadium in Washington on April 17, 1953, the entire baseball world was lead to believe the ball had traveled 565 feet from home plate to the point where it landed. In truth, that figure derived from the distance from home plate to the place where a neighborhood child retrieved the ball. Since this home run was the only one that ever cleared those bleachers during decades of major league and Negro League competition, it is genuinely deserving of recognition. However, the actual distance in the air was probably about 510 feet. The same process was at work for Mantle on September 10, 1960, in Detroit, where his right-center-field rooftopper was reported to have traveled more than 600 feet. http://www.baseball-almanac.com/feats/art_hr.shtml

Their really isn't one correct answer to this question, I'll try to explain. I’ll start with the home run that Mickey Mantle hit at Griffith Stadium in Washington on April 17, 1953. The entire baseball world was led to believe the ball had traveled 565 feet from home plate to the point where it landed. In truth, that figure derived from the distance from home plate to the place where a neighborhood child retrieved the ball. However, the actual distance in the air was probably about 510 feet (most sources still have this as #1). The same process happened again with Mantle on September 10, 1960 at Briggs Stadium in Detroit when a ball he hit was reported to have traveled 643 feet but it is readily apparent once again that the ball had bounced several times before it reached the estimated distance (this is the home run that the "Guinness Book of Records" has as #1). When your talking about tape measure home runs you can’t leave out Babe Ruth. It was said that Ruth once hit one 587 feet in an exhibition game against the Giants back in 1919. Also his tremendous blow to right-center field in Detroit on June 8, 1926, has often been reported as traveling 628 feet, but again was it measured where it first landed or where it came to a rest. Included among the other great exaggerations in the history of tape measure home runs are Dave Nicholson’s Comiskey Park rooftopper on May 6, 1964 who’s shot was calculated at 573 feet. The calculations were on the assumption that the ball traveled completely over the left-center-field roof. However, subsequent investigation indicated that the ball landed on the back of the roof before bouncing out into the night. Also, when Dave Kingman launched his wind-aided blow in Chicago’s Wrigley Field on April 14, 1976, "The New York Times" somehow concluded that it had flown 630 feet. It has been confirmed that the ball struck against the third house beyond Waveland Avenue, which is situated about 530 feet from home plate. Yet another claim (by the "Guinness Book of Records"), has a minor league player by the name of Roy Edward "Dizzy" Carlyle having hit one 618 feet at Emeryville Ball Park, CA on July 4, 1929. Mark McGwire hit several home runs over 500 feet and one over 540 and his is measured accurately every time he hits one. I know I didn’t cover everything but I hope I covered enough to satisfy you. Also, Mantle's home run off the facade at Yankee Stadium on May 22, 1963 traveled between 370 to 374 feet and was between 115 to 117 feet high. If it was still going up like some people claim it would have traveled an estimated distance of 620 feet if left unimpeded. However, the reality is that the ball was already on its way down, and those reporting the trajectory were victimized by a common optical illusion. It is a scientific fact that if Mantle, or anyone else, had sufficient strength to hit a ball that was still traveling upward when it met the towering facade, he would also have enough strength to clear that same facade by a distance of at least 100 feet. In order for the ball to be rising at roof level, it would have to have been traveling at a lower angle than that which produces maximum distance. If Mantle had provided the same power or velocity, but had launched the ball at a higher and more efficient angle, it would have passed out of Yankee Stadium at a height of over 200 feet! Mantle hit the facade on two or perhaps three occasions, but never cleared it. http://www.baseball-almanac.com/feats/art_hr.shtml

whats the longest homerun and by who you ask..... i have a good answer for you.... :) all of you.... I recently aquired an OFFICIAL 2006 Topps Sterling 5 piece games used baseball card.. A 1/1 card of MICKEY MANTLE !!! which should shedd some light on the subject... on the front.. the first piece looks really weird a factory error (intentional?), all five pieces form out 734FT and just below that it says the longest home run in baseball history. on the back it lists mickey mantle's top 5 homeruns and their distances..... 1. 734 Ft. in 1963 Yankee Stadium 2. 660 Ft. in 1951 3. 650 Ft. in 1953 at Briggs Stadium 4. 643 Ft. in 1960 at Tiger Stadium 5. 630 Ft. in 1953 at Yankee Stadium Unaware of these homeruns I started doing research... i found answers at www.themick.com , if you click the middle picture it tells you about mickey mantles ten longest homeruns in great detail..... I think the answer is clear... even if mantle's number one ball never gets fully recognized, I say to those who question the furiousity of his blast to do your own math cause I think he was short changed.... that homerun listed second was hit in the air no obsticals by mickey mantle when he was just 19 years old! so.... anyways, i think i've found the answer to your question... bring on a hard one... LoL :)

I do recall that Babe Ruth once hit one into a passing train car-that would be the winner!

What about the Cincinnati Red (forgot his name) that hit a HR & it landed on a piece of driftwood in the Ohio River? "The Babe" or "The Mick" didn't do that!