How to query State code? None displayed for me

Love the plugin, the radius search works perfectly but how do I do the custom meta properly for the admin codes to work?

For eg I have posts with custom meta like:
geo_address : JB HI Fi Store, Sydney, New South Wales, Australia
geo_longitude : 151.2069902
geo_latitude : -33.8674869

and in my php file I’m querying like this:

$nv_query = new WP_Query( array(
‘geo_mashup_query’ => array(
‘admin_code’ => ‘NSW’,
)
) );

n no posts listed. Thank you 4 any help

https://wordpress.org/plugins/geo-mashup/