This demo finds the center of a bunch of addresses, defined as the average of the latitudes and of the longitudes. (Note that this is not the same thing as midway between the extremes. Consider it a "weighted center".)
Put the addresses in the text box below, one per line, and click the button. The big red marker with the dot on it, in the middle of the map, is the center. The smaller blue markers represent addresses you put in.
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