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That is not possible. The plugin displays the markers on the map based on the coordinates saved in database. The coordinates are generated based on the address the member enters in the location tab.
One option is to limit the address fields that the members are able to enter; for example, to city/town and state.
Another option is to wait to the next release of the plugin which includes new filters. Using one of the new filters you will be able to set the maximum zoom of the map. Means that you will be able limit the users from zooming in the map all the way down. You will be able to set it to zoom in just enough to see in which city or area the members located.