Layer Estimates:

Layer: County boundaries (ID:0)
Count: 100
Extent:

XMin: -9386639.7054
YMin: 4006583.4026
XMax: -8400166.6289
YMax: 4381891.3324
Spatial Reference: 102100 (3857)

Layer: Census Tracts (2017) (ID:1)
Count: 2195
Extent:

XMin: -9386662.6499
YMin: 3995668.5421
XMax: -8393503.032
YMax: 4381853.821
Spatial Reference: 102100 (3857)