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Circles

  • This example demonstrates how to create circles on a Google Map to represent populations in North America.

  • Circles are scaled based on city population data using a mathematical formula.

  • The map is centered on North America and uses a "terrain" map type.

  • The example uses JavaScript or TypeScript to define city data and create the map and circles with the Google Maps API.

This example creates circles on the map, representing populations in NorthAmerica.

Read thedocumentation.

TypeScript

// This example creates circles on the map, representing populations in North// America.// First, create an object containing LatLng and population for each city.interfaceCity{center:google.maps.LatLngLiteral;population:number;}constcitymap:Record<string,City>={chicago:{center:{lat:41.878,lng:-87.629},population:2714856,},newyork:{center:{lat:40.714,lng:-74.005},population:8405837,},losangeles:{center:{lat:34.052,lng:-118.243},population:3857799,},vancouver:{center:{lat:49.25,lng:-123.1},population:603502,},};functioninitMap():void{// Create the map.constmap=newgoogle.maps.Map(document.getElementById("map")asHTMLElement,{zoom:4,center:{lat:37.09,lng:-95.712},mapTypeId:"terrain",});// Construct the circle for each value in citymap.// Note: We scale the area of the circle based on the population.for(constcityincitymap){// Add the circle for this city to the map.constcityCircle=newgoogle.maps.Circle({strokeColor:"#FF0000",strokeOpacity:0.8,strokeWeight:2,fillColor:"#FF0000",fillOpacity:0.35,map,center:citymap[city].center,radius:Math.sqrt(citymap[city].population)*100,});}}declareglobal{interfaceWindow{initMap:()=>void;}}window.initMap=initMap;
Note: Read theguide on using TypeScript and Google Maps.

JavaScript

constcitymap={chicago:{center:{lat:41.878,lng:-87.629},population:2714856,},newyork:{center:{lat:40.714,lng:-74.005},population:8405837,},losangeles:{center:{lat:34.052,lng:-118.243},population:3857799,},vancouver:{center:{lat:49.25,lng:-123.1},population:603502,},};functioninitMap(){// Create the map.constmap=newgoogle.maps.Map(document.getElementById("map"),{zoom:4,center:{lat:37.09,lng:-95.712},mapTypeId:"terrain",});// Construct the circle for each value in citymap.// Note: We scale the area of the circle based on the population.for(constcityincitymap){// Add the circle for this city to the map.constcityCircle=newgoogle.maps.Circle({strokeColor:"#FF0000",strokeOpacity:0.8,strokeWeight:2,fillColor:"#FF0000",fillOpacity:0.35,map,center:citymap[city].center,radius:Math.sqrt(citymap[city].population)*100,});}}window.initMap=initMap;
Note: The JavaScript is compiled from the TypeScript snippet.

CSS

/* * Always set the map height explicitly to define the size of the div element * that contains the map. */#map{height:100%;}/* * Optional: Makes the sample page fill the window. */html,body{height:100%;margin:0;padding:0;}

HTML

<html>  <head>    <title>Circles</title>    <link rel="stylesheet" type="text/css" href="./style.css" />    <script type="module" src="./index.js"></script>  </head>  <body>    <div></div>    <!--       The `defer` attribute causes the script to execute after the full HTML      document has been parsed. For non-blocking uses, avoiding race conditions,      and consistent behavior across browsers, consider loading using Promises. See      https://developers.google.com/maps/documentation/javascript/load-maps-js-api      for more information.      -->    <script      src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&v=weekly"      defer    ></script>  </body></html>

Try Sample

Clone Sample

Git and Node.js are required to run this sample locally. Follow theseinstructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application.

gitclone-bsample-circle-simplehttps://github.com/googlemaps/js-samples.gitcdjs-samplesnpminpmstart

Other samples can be tried by switching to any branch beginning withsample-SAMPLE_NAME.

gitcheckoutsample-SAMPLE_NAMEnpminpmstart

Except as otherwise noted, the content of this page is licensed under theCreative Commons Attribution 4.0 License, and code samples are licensed under theApache 2.0 License. For details, see theGoogle Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-12-11 UTC.