The GeographyLevel property is used to specify a standard Business Analyst data layer. Filtering for specific records is supported with the GeographyIDs property or Query property; however, they cannot be specified as both. In Business Analyst Online API, the Query property is temporary not supported.

Most use cases involve the retrieval of areas associated with an installed geography level. For the default Business Analyst dataset, this includes geography levels such as Census Block groups, Census Tracts, and U.S. ZIP codes. In many cases, queries involve the use of standardized FIPS codes.

System.Object
   ESRI.ArcGIS.Client.BACore.StandardLayer

Target Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, Windows Vista, Windows Server 2008 family

Reference