RegionID, SizeRank,RegionName, RegionType; state / metro add StateName; county / city /State, Metro, CountyName and others. Extra keys{
"RegionID": 0,
"SizeRank": 0,
"RegionName": "string",
"RegionType": "string",
"StateName": "string",
"observations": [
{
"month": "2026-03-31",
"value": 0
}
],
"count": 315,
"property1": "string",
"property2": "string"
}