If you need to find altitude of an address, such as to check future house location to see if flood would be a problem, you can use Google Map.
Go to website: http://www.daftlogic.com/sandbox-google-maps-find-altitude.htm and type in your address. As shown in the picture below. White House (1600 Pennsylvania Ave NW, Washington, DC 20500) has elevation of 48 feet.
