You can use targeting values in ads placement to define your intended audience.

Targeting metrics are organized around targeting specifications.

For more information on ads targeting, see Audience targeting.

Sample return:

 [{"36313": "Australia: Moreton Bay - North", "124735": "Canada: North Battleford", "36109": "Australia: Murray", "36108": "Australia: Mid North Coast", "36101": "Australia: Capital Region", "811": "U.S.: Reno", "36103": "Australia: Central West", "36102": "Australia: Central Coast", "36105": "Australia: Far West and Orana", "36104": "Australia: Coffs Harbour - Grafton", "36107": "Australia: Illawarra", "36106": "Australia: Hunter Valley Exc Newcastle", "554017": "New Zealand: Wanganui", "554016": "New Zealand: Marlborough", "554015": "New Zealand: Gisborne", "554014": "New Zealand: Tararua", "554013": "New Zealand: Invercargill", "GR": "Greece", "554011": "New Zealand: Whangarei", "554010": "New Zealand: Far North", "717": "U.S.: Quincy-Hannibal-Keokuk", "716": "U.S.: Baton Rouge",...}]