Table 4.

Studies categorized by applied spatial units.

Spatial unit	Studies	Count
Census tracts	(4, 47, 49–51, 53, 58, 71–80)	17
Zip/postal codes	(1, 2, 7–9, 23, 44, 81–83)	10
States	(69, 84–89)	7
Block groups	(45, 55, 90–93)	6
Census blocks	(43, 52, 94–96)	5
Cities	(63, 97–99)	4
Point level	(54, 56, 57)	3
Municipalities	(61, 100, 101)	3
Countries	(41, 42)	2
Economic regions	(68, 102)	2
Local government areas	(48, 103)	2
Police-defined areas	(104,105)	2
Neighborhoods	(46, 106)	2
Rural communities	(70)	1
Metropolitan areas	(107)	1
Counties	(5)	1
Buffered college areas	(108)	1
Electoral wards	(67)	1
Total geospatial studies		70