This plugin supports multiple markers per map! Kudos to yohman for his plugin: http://wordpress.org/extend/plugins/google-maps-v3-shortcode/
This plugin allows you to add one or more maps (via the Google Maps v3 API) to your page/post using shortcodes. This plugin supports multiple markers per map !
Requires: 2.8 or higher
Compatible up to: 4.1.7
Last Updated: 2015-3-23
Active Installs: 1,000+
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