ArcGIS REST Services Directory
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Legend (Demographics/USA_Population_Density)

Block Groups (1)
100,001 or more people
25,001 to 100,000 people
10,001 to 25,000 people
1,001 to 10,000 people
101 to 1,000 people
100 or less people
No population
Tracts (2)
100,001 or more people
25,001 to 100,000 people
10,001 to 25,000 people
1,001 to 10,000 people
101 to 1,000 people
100 or less people
No population
Counties (3)
100,001 or more people
25,001 to 100,000 people
10,001 to 25,000 people
1,001 to 10,000 people
101 to 1,000 people
100 or less people
No population
States (4)
100,001 or more people
25,001 to 100,000 people
10,001 to 25,000 people
1,001 to 10,000 people
101 to 1,000 people
100 or less people
No population