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You can use this widget : http://widgets.jotform.com/widget/address_map_locator
There is a demo form, however, I would like to share you the link here as well : http://form.jotformpro.com/form/50566121552954
You can clone it by following this guide : http://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL
Also, you can find more mapping widgets on this link : https://widgets.jotform.com/category/mapping
This guide will help you to add the widget to your form : http://www.jotform.com/help/252-How-to-Add-a-Widget-to-your-Form
Hope this helps.
Feel free to contact us anytime if you need more help, we will be glad to assist you.