Last month I posted on how to create a map zoom with a radial distance circle and increasing mark size. In this blog post, I will demonstrate how to do marker clustering in Tableau using parameter actions. When plotting hundreds or thousands of points on a map, the map can get very cluttered. One technique that can be useful is clustering the points into one marker. The size of the marker can indicate the number of points in that area.This technique requires a few calculations and a parameter action, but it is pretty straight forward. I will use the same dataset that I used in my previous post, without the extra fields. You can download the dataset here to follow along. This dataset has some three fields for some points in Cincinnati, Ohio. We will map these points using Latitude and Longitude in the dataset.