The US Department of Justice - Bureau of Justice Statistics collects vast amount of information on crime and law enforcement in the United States. You can use this site to gain "At a Glance" statistics as well as more in-depth time-series data.
ATF-related data from national surveys, state-based surveys, other collected license statistics, and other data sources documents trends in firearms, commerce and use of federal services in the United States.
The FBI's Crime Data Explorer (CDE) aims to provide transparency, create easier access, and expand awareness of criminal, and noncriminal, law enforcement data sharing; improve accountability for law enforcement; and provide a foundation to help shape public policy.
The Yearbook of Immigration Statistics is a compendium of tables that provides data on foreign nationals who, during a fiscal year, were granted lawful permanent residence (i.e., admitted as immigrants or became legal permanent residents), were admitted into the United States on a temporary basis (e.g., tourists, students, or workers), applied for asylum or refugee status, or were naturalized. The Yearbook also presents data on immigration enforcement actions, including alien apprehensions, removals, and returns. The Yearbook tables are released as they become available.
The Annual Social and Economic Supplement (ASEC) to the Current Population Survey (CPS) is the source of official national poverty estimates. The American Community Survey (ACS) provides single and multi-year estimates for smaller areas. The Survey of Income and Program Participation (SIPP) provides longitudinal estimates. The Small Area Income and Poverty Estimates (SAIPE) program provides model-based poverty estimates for counties and school districts. See Description of Income and Poverty Data Sources to determine which survey or program meets your specific needs.