Table 31, Data Declaration

Number and Rate of Arrests, by Population Group, 2005

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The FBI collects these data through the Uniform Crime Reporting (UCR) Program.

General comments

This table provides the number of arrests and the arrest rate per 100,000 inhabitants for the eight UCR population groups (see below), U.S. cities as a whole, and for the Nation.
These data represent the number of persons arrested; however, some persons may be arrested more than once during a year. Therefore, the statistics in this table could, in some cases, represent multiple arrests of the same person.

Methodology

The data used in creating this table were from all law enforcement agencies submitting 12 months of complete arrest data for 2005.
The FBI derived the arrest rates by first dividing the total aggregated arrests by the aggregated populations covered by contributing agencies and then multiplying the resulting figure by 100,000.

Population groups

The UCR Program uses the following population group designations:

Population Group	Political Label	Population Range
I	City	250,000 and more
II	City	100,000 to 249,999
III	City	50,000 to 99,999
IV	City	25,000 to 49,999
V	City	10,000 to 24,999
VI	City¹	Less than 10,000
VIII (Nonmetropolitan County)	County²	N/A
IX (Metropolitan County)	County²	N/A

¹Includes universities and colleges to which no population is attributed.
²Includes state police to which no population is attributed.

Population estimation

The FBI calculated 2005 state growth rates using revised 2004 state/national population estimates and 2005 provisional state/national population estimates provided by the U.S. Census Bureau. The FBI then estimated population figures for city and county jurisdictions by applying the 2005 state growth rate to the updated 2004 U.S. Census Bureau data.

If you have questions about this table

Contact the Communications Unit of the FBI’s Criminal Justice Information Services Division via e-mail at cjis_comm@leo.gov or by telephone at (304) 625-4995.