Here is an extract from the json that is a result of the URL mentioned above. Three entries. Your Station ID is one of these.
"type": "Full Power Broadcast",
"name": "KIEM",
"callSign": "KIEM",
"stationId": "10510",
"affiliateId": "10991",
"affiliateCallSign": "NBC",
"type": "Full Power Broadcast",
"name": "KIEMDT2 (KIEM-DT2)",
"callSign": "KIEMDT2",
"stationId": "108197",
"affiliateId": "18633",
"affiliateCallSign": "ION",
"type": "Full Power Broadcast",
"name": "KIEMDT (KIEM-DT)",
"callSign": "KIEMDT",
"stationId": "34913",
"affiliateId": "10991",
"affiliateCallSign": "NBC",