ArcGis Desktop 10.3.1 does not dissolve to a single row while version 10.3 does it. We use .NET API but we also tested using Python. In both cases dissolve fails to do it. Same error in all versions > 10.3 import arcpy arcpy.env.workspace = "C:\Users\mpersson0613\OneDrive - Quest Analytics, Inc\Documents\ArcGIS\Default.gdb" arcpy.Dissolve_management("C:/GeoStan/2019/shapefile/FL/FLzips_region.shp", "C:/GeoStan/OutputFromPython/FLDissolveFromZip", ["STATE", "STATE_FIPS"], "ID FIRST", "MULTI_PART", "DISSOLVE_LINES")
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