Get coordinates from postcode data with Ordinance Survey OpenSpace API

16 March 2013 - Kev Kirkland

If you need to get geographic co-ordinates for a postcode you can use the Ordinace Survey OpenSpaces web api.

First sign up for a developer’s key here.

They will email you a key which you can use in your javascript to access the service. Here’s a snippet of code which will get the co-ordinates for a postcode. The co-ordinates will be in BNG (British National Grid) co-ordinate system, which gives you a easting and northing co-ordinate. These figures represent where the location is on a grid overlaid over Britain (ranging from 0, 0 to 1300000, 800000). You’ll need to substitute your api key for the text ‘YOUR_KEY’.

    <script type="text/javascript" src=""></script>
    <script type="text/javascript">
        var postcode = "BS8 1UB";
        var pc = new OpenSpace.Postcode();
        var callback_func = function (data) {
            var easting = data.getEasting();
            var northing = data.getNorthing();
            console.log("Here is the data:");
            console.log("Easting: " + easting);
            console.log("Northing: " + northing);
        pc.getLonLat(postcode, callback_func);