The sea is at a particular level compared to land. Most land is above sea level (or it would be under the sea or very far inland). If you are a mile above sea level, then you are a mile above where the sea would be if there was no land there.
Brockton,MA is 112 feet [34.1376m] above sea level.
300m
731.5 meters above sea level.
mt. ararat is 16945ft above sea level
Greenville, Ohio has an average elevation of approximately 1,050 feet above sea level.
About 541 feet above sea level.
110 metres above sea level
Buckingham, Florida is approximately 30 feet above sea level.
Oxford is 129m above sea level
It is 781 feet above sea level.
It is 544 feet above sea level.
325 feet above sea level.
500 ft above sea level
Part of it is at sea level. The highest point is 18.04 ft above sea level.
Key West is 18 feet above sea level.
0 to 12 m above sea level (it is just on the shores of the Caribbean Sea).