City Markers example

<html>
  <head>
    <script type='text/javascript' src='https://www.google.com/jsapi'></script>
    <script type='text/javascript'>
     google.load('visualization', '1', {'packages': ['geochart']});
     google.setOnLoadCallback(drawMarkersMap);

function drawMarkersMap() {
      var data = google.visualization.arrayToDataTable([
        ['City',  'Population', 'Area'],
        ['New York',     2761477,    1285.31],
        ['Baltimore',    1324110,    181.76],
        ['New Orleans',   959574,     117.27],
        ['Chicago',    907563,     130.17],
        ['Des Moines',  655875,     158.9],
      ]);

var options = {
        region: 'US',
   //    resolution: 'metros'
        displayMode: 'markers',
     //   colorAxis: {colors: ['green', 'blue']}
      };

var chart = new google.visualization.GeoChart(document.getElementById('chart_div'));
      chart.draw(data, options);
    };
    </script>
  </head>
  <body>
    <div id="chart_div" style="width: 900px; height: 500px;"></div>
  </body>
</html>

https://www.google.com/jsapi