text: Some of the answers above are correct but with inaccurate explanations.\n\nAway from earth's surface (a good approximation is sea-level), distance decreases its gravitational pull.\n\nBut, under earth's surface, distance also decreases gravitational pull.  At the center of earth, its gravitational pull is zero or negligibly small.\n\nEven at the same elevation, gravity has small variations at different locations.  The variations are small enough for us to detect.  But there exists super sensitive people who can detect those variations.\n\nThe safe guess is that Mt. McKinley has lower gravitational pull.  But to be sure, we need to do measurements there and at the Red Sea.