Law Enforcement Agency Identifiers Crosswalk (LEAIC), 2012
A reference file linking law enforcement agency identifiers to census geography, used to place reporting agencies on the map.
A cross-sectional 2012 file designed to attach geographic and government information to law enforcement agency records. It holds records for law enforcement agencies, reporting entities and related identifiers, carrying both the seven-character Originating Agency Identifier used by the FBI's summary reporting system and the nine-character identifier used for incident-based reporting, alongside state, county and place FIPS codes.
Its stated sources are the 2008 Census of State and Local Law Enforcement Agencies, an NCIC extract, and the FBI's 2012 Offenses Known and Clearances by Arrest collection.
Coverage#
36,490 agency records nationwide. Of these, 22,823 are municipal police departments or sheriff's offices, the categories relevant to city-level crime reporting, and 15,029 city records in Birdseye currently carry a matched agency.
The file is a 2012 snapshot and is not refreshed. Agencies created, merged or dissolved since then are not reflected, which is the main reason coverage is partial.
How we use it#
Crime data arrives keyed to a reporting agency, not to a place. This crosswalk is what lets an agency's figures be attributed to the municipality it polices, and it supplies the agency name shown alongside crime values on the map. It produces no metric of its own; see Crime Index for the measures it supports.
Considerations#
The seven-character identifier is recorded as "-1" for a large share of records, a placeholder rather than a real value, and those rows cannot be linked to crime reporting. ICPSR also documents a known error in which the Philadelphia Police Department is assigned the wrong county FIPS code.
Citation#
United States. Bureau of Justice Statistics. Law Enforcement Agency Identifiers Crosswalk, United States, 2012. Inter-university Consortium for Political and Social Research [distributor], 2018-09-18. https://doi.org/10.3886/ICPSR35158.v2
ICPSR asks that its study page or DOI be linked rather than its files redistributed, and states that the original collector, ICPSR and the funding agency bear no responsibility for uses or interpretations of the data.
References#
- 1US Bureau of Justice Statistics, distributed by ICPSRhttps://www.icpsr.umich.edu/web/NACJD/studies/35158