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Frequently Asked Questions (FAQs)

What data are on this site?

From the UCR Data Tool it is possible to obtain 1985 through current Part I offense data for local law enforcement agencies 10,000 and over in population and county law enforcement agencies 25,000 and over in population. Also available are national and state violent and property crime estimates for 1960 through current.

Where can I find other types of crime data (arrests, officer assaults, and hate crime statistics) collected by the FBI?

At this time, it is not possible to access arrests, officer assaults, or hate crime statistics from the UCR Data Tool. However, annual arrest data and hate crime statistics can be accessed from the Uniform Crime Reporting (UCR) Program publications Crime in the United States, Law Enforcement Officers Killed and Assaulted, and Hate Crime Statistics, which are available at <www.fbi.gov/about-us/cjis/ucr>.

Why doesn't the agency I'm seeking have data for every year I requested?

Offense data included in this tool is inclusive of agencies supplying at least 1 month of data for a given year, and the agency's population was within the population criteria.

Why are the numbers that I see different than what I saw listed in the edition of Crime in the United States for the same year?

It is possible for a law enforcement agency to submit adjustments to previously reported or published data after the release of the annual publication, Crime in the United States.

How often are data on this site updated?

The data will be available initially with the release each fall of the annual UCR publication Crime in the United States. Data published on this site at that time will be based on a database that was frozen in order to prepare the publication Crime in the United States. The data on UCR Data Tool will be updated in the spring of the following year, when the UCR Master Files are finalized with all data supplied by UCR contributors for that year.

Why aren't smaller towns and county agencies included in the listings?

At this time, only data for city law enforcement agencies 10,000 and over in population and county law enforcement agencies 25,000 and over in population are on this site. It is possible the database will be expanded to include all remaining UCR Program contributors and their reported data.

Where do populations listed here come from?

The UCR Program obtains the national, state, and city and county population data from the U.S. Census Bureau. When preparing yearly population for UCR purposes, the Census has available current year population estimates for the Nation and by state. For cities and counties, however, Census estimates are not current and, therefore, the UCR Program estimates the city and county populations to derive current year estimates.

For example, for 2009 estimates, the FBI computed individual rates of growth from one year to the next for every city/town and county using 2000 decennial population counts and 2001 through 2008 population estimates from the Census Bureau. Each agency's rates of growth were averaged; that average was then applied and added to its 2008 Census population estimate to derive the agency's 2009 population estimate.

How do you derive estimates for national and state data?

The national and state violent and property crime estimates are inclusive of all law enforcement agencies participating in the UCR Program (including those submitting less than 12 months of data).

Because not all law enforcement agencies provide data for complete reporting periods, it is necessary to estimate for the missing data. The FBI computes estimates for participating agencies not providing 12 months of complete data. For agencies supplying 3 to 11 months of data, the national UCR Program estimates for the missing data by following a standard estimation procedure using the data provided by the agency. If an agency has supplied less than 3 months of data, the FBI computes estimates by using the known crime figures of similar areas within a state and assigning the same proportion of crime volumes to nonreporting agencies. The estimation process considers the following: population size covered by the agency; type of jurisdiction, e.g., police department versus sheriff's office; and geographic location.

Why does the agency I'm looking for not have data for all the years I want?

Law enforcement agencies available on this site have reported at least 1 month's data for a given year, and the agency's population if a city is over 10,000 and if a county, the population is over 25,000.

What if I have questions?

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

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