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Table 1. Urbanicity Index: Count of 2010 Census Tracts by Category

CategoryCensus TractsWith population density centileNumber of Tracts
UrbanIn UAs60 to 10028,356
In UCs30 to 1002,729
Total (urban)31,085
SuburbanIn UAsGreater than 0 and less than 6018,173
In UCsGreater than 0 and less than 30598
Total (suburban)18,771
RuralNot in an UA or UCN/A22,563
Total (rural)22,563
No population (but land area)320
Total72,739
Notes: 

There are 317 Census tracts defined in the 2017 Tigerline Census Tract files with no land area. There are 320 tracts with land area but with no population in the 2017 Tigerline Census Tract files.

Urbanized Areas (UAs) area areas with 50,000 or more people; Urban Region/divisions (UCs) are areas with at least 2,500 and less than 50,000 people. Census Tracts in UAs are defined as those with their centroid in an UA; Census Tracts in UCs are those with their centroid in an UC. 

Density centile was calculated by sorting Census Tracts with a population greater than 0 by their population density in ascending order and then assigning a score from 0 to 100 to each Census Tract according to this order. The Census tract with the smallest population density was assigned a score of 0 and the Census tract with the largest population density was assigned a score of 100.