Layer Estimates:

Layer: Population of 500k+ (ID:0)
Count: 84
Extent:

XMin: -17614227.626675
YMin: 2036544.22626212
XMax: -7318237.85239222
YMax: 6112713.49721945
Spatial Reference: 102100 (3857)

Layer: Population of 150-500k (ID:1)
Count: 151
Extent:

XMin: -16706239.7509202
YMin: 2069174.18370862
XMax: -7449876.30855159
YMax: 8689584.25457987
Spatial Reference: 102100 (3857)

Layer: Population of 50-150k (ID:2)
Count: 275
Extent:

XMin: -17573195.4560193
YMin: 1504717.16414052
XMax: 16135573.7764204
YMax: 9589669.61912901
Spatial Reference: 102100 (3857)

Layer: Population of 30-50k (ID:3)
Count: 1287
Extent:

XMin: -18024483.2643819
YMin: 1502448.42321386
XMax: 16110400.4396424
YMax: 8581939.99127651
Spatial Reference: 102100 (3857)

Layer: Population of 15-30k (ID:4)
Count: 451
Extent:

XMin: -17745891.8417104
YMin: 2049342.01643533
XMax: -7325260.77882093
YMax: 8726943.52237676
Spatial Reference: 102100 (3857)

Layer: Population of 5-15k (ID:5)
Count: 1287
Extent:

XMin: -18024483.2643819
YMin: 1502448.42321386
XMax: 16110400.4396424
YMax: 8581939.99127651
Spatial Reference: 102100 (3857)

Layer: Population of 1-5k (ID:6)
Count: 227
Extent:

XMin: -17756561.6338342
YMin: 2032454.23273303
XMax: -7208618.62146517
YMax: 8515688.43788709
Spatial Reference: 102100 (3857)

Layer: Tracts (ID:8)
Count: 72742
Extent:

XMin: -19942581
YMin: 2144425
XMax: 20012846
YMax: 11537092
Spatial Reference: 102100 (3857)

Layer: SAMPLE: Distance from MA of 500k+ (ID:16)
Count: 4
Extent:

XMin: -17743821.5099419
YMin: 1909283.0696423
XMax: -7191309.10062851
YMax: 6295354.61221321
Spatial Reference: 102100 (3857)