How to manage Multiple markers at the same latitude and longitude

I have markers which would be displayed at the same location..

i.e one or more markers would have the same latitude and longitude

For e.g

http://4sqsearch.com/search.php?point=%2840.7142691,%20-74.0059729%29&place=New%20York&tag=Fish&within=4&type1=2&checkins=0

In the above map some of the markers are missing as they have the same
location..

Whether there is any code to display the markers at the same longitude
and latitude differently

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