Layer Estimates:

Layer: US Cities (ID:0)
Count: 31254
Extent:

XMin: -19662305.9990705
YMin: 2032387.36223065
XMax: 19381947.8615077
YMax: 11496165.5593588
Spatial Reference: 102100 (3857)

Layer: National Walkability Index (ID:2)
Count: 220739
Extent:

XMin: -20037507.0671792
YMin: -2959773.09600161
XMax: 20037507.0671792
YMax: 30241041.7541664
Spatial Reference: 102100 (3857)