People Investigations

General People Search

Melissa Lookups
Arguably one of the best search tools for people out there. Provides a massive amount of tools and resources to search people by name, address, phone number and so on. They also provide loads of other useful tools and resources including maps, federal data, property records and more.
SocialCatfish
Find connections and verify a person's online identity using a name, image, email address, phone number, username or physical address.
Verecor
Generic people search site for U.S. citizens.
uFind Name
Search for a persons name and see matching results including LinkedIn and Facebook accounts, whitepage results, vehicle registration database entries, marketing data and more.
Pipl
One very great tool for locating people by name, address, email address, username and so on. Once offered as a free service many moons ago, now requires a paid subscription.
Phonebooks
A free international people search, telephone directory and address search.
xLek
A free public data search site mainly for U.S. citizens. Was formerly known as Cubib.
Cloob
An Iranian people search engine.
BehindTheName
Find different pronunciations of a name and their diminutives.
How Many of Me
Search a first and last name and see how many people in the U.S. share the same name.
Business Card Search
This Google CSE allows you to search through digital business card sites. Created by @dutch_osintguy.
IntelX Person Search
A great people meta search engine offered by IntelX.

Vital Record Search Tools
This site contains tools for finding immigration records, census records, vital records, and for dealing with calendars, maps, foreign alphabets, and numerous other applications. Some of these tools fetch data from other websites but do so in more versatile ways than the search tools provided on those websites. Created by Stephen P, Morse.
US Census Record Database
Federal census records have been digitized and made available to the public. US census records currently available date from 1790 to 1940.
UK Census Online
Census records from the United Kingdom have been digitized and made available to the public. Includes birth, death, marriage, and census records.
Social Security Death Index Search
Another tool from Stephen P. Morse that allows you to easily search through the US social security death index (SSDI). Records are from 1936 to February 28th, 2014.
SlaveVoyages
Includes detailed information on over 35,000 trans-atlantic slave trading voyages that occurred between 1520 and 1866 as well as estimates of the overall size and direction of the trade.
Ellis Island Passenger Search
A searchable archive of over 65 million records of passengers arriving to the Port of New York, USA from 1820 to 1957.
VoterRecords
Free political research tool to study more than 92 million U.S. voter records.

Ancestry
The world's largest collection of online family history records and genealogy records. Requires a paid subscription.
GenealogyOnline
Search for ancestors and relatives in published family trees. Also allows you to publish yourself to find matches in other family trees. (Please do not actually do that).
FamilySearch
Search for family ancestors, family history and family trees. Requires registration.
US National Archives Resources for Genealogists
Provides a wealth of resources related to genealogy for people in the U.S.
Archives Canada Genealogy and Family History
Access the Canadian ancestry and genealogy records and discover a wealth of information for people in Canada.
CubaGenWeb
An on-line bi-lingual depository of resources and data dedicated to Cuban Genealogy. It is intended to facilitate the search for Cuban roots by providing as much information as possible to get you started in your research and help fill in some of the missing blanks.

JudyRecords
Search over 580 million United States court cases.
CaseLaw Access Project
A free tool that allows you to search over 1.7 million U.S. federal cases and over 4.9 million state cases.
CourtListener
Search over 4 million U.S. federal and state cases and opinions in over 400 different jurisdictions.
CourtRecord
Search complete and up-to-date public court records in the U.S.
DocketAlarm
A searchable database with over 91 million state cases. Over 19 million specialized agency cases such as patent, trademark, tax, international trade, etc.
SearchSystems
Search for United States public records.
UniCourt
Provides case research, tracking and legal analytics of court data.
BRB Public Records
A large catalog of public records and data sources for the U.S.
New Zealand Court Records
Judgements of public interest issued by the Supreme Court, Court of Appeal and the High Court of New Zealand.

USA Arrests
Search for a U.S. citizen by first and last name and see that individuals recent arrests.
BC CSO
Search by name for criminal history records for residents of British Columbia, Canada.

FamilyWatchdog
A free service to search for registered sex offenders in the United States.
National Sex Offenders
A free government provided public database of registered sex offenders in the U.S.
IBB Claims UK
A list of convicted sex offenders in the UK. As the UK sex offender registry is not available to the public, the names listed are pulled from various news articles and sources.

The Inmate Locator
Search for U.S. offenders, inmates and prisoners by name and state. Also provides other useful information.
InmateAid
Helps you locate and connect with inmates in the U.S. prison system.
BOP Inmate Locator
Search for U.S. prisoners by BOP register, DCDC, FBI, INS number or by name. Contains information about federal inmates incarcerated from 1982 to the present.
JailBase
Search for U.S. inmates by name. Also provides a generic people search tool.
The Inmate Search
Yet another U.S. inmate search tool.