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Here are a few sites modern day sleuths may use:

Court records, jail records, corporate records, and more.

1. Free Public Records Finder: Search free public records by state, view corporate records, court records, criminal records and more on this site.
2. Net-Investigation.com: Search by state to look up court records on almost anyone. This site also provides a background check crash course and tutorials for how to find the most relevant information.
3. Public Record Finder:  Finds free public records using the largest public records search database on the World Wide Web.
4. Public Record Directory: Finds free public vital and cell phone records using the largest public records reverse search detective database on the World Wide Web.
5. Dates and Love: Run a background check, reverse cell phone number lookup, employee screening or people search on this site for free.

Criminal Background Checks

1. Detective Unlimited: This site connects users to a free version of the Intelius service. Results bring up addresses, lawsuits, sex offender information, property ownership, relatives, neighbors, marriage records and more.
2. Public Records Information: Search by state and county on this site and get links to investigation records, judicial organizations, sex offender registries and more.
3. Prison Inmate Search - Search for a prison inmate, prison records, offender records and sexual predators at Federal Prisons, State Prisons and County Jails

Sex Offender Sites

1. National Sex Offender Registry: The family watchdog on this site directs users to a search by location or search by name.
2. FBI Crimes Against Children: Click on a state to conduct a sex offender search from the FBI’s website.
3. MapSexOffenders.com: There are over 300,000 sex offenders listed in this database. You can view maps of the offenders and search by name.
4. National Sex Offender Public Registry: On this site, you can type in a name, zip code, county or city to perform your search. Results include a photo, names and aliases used by the offender, registration information and address.
5. Free Sex Offenders Search: Perform a sex offender lookup by state and get public access to criminal records and jail records.
6. SexOffender.com Database Search: Look up sex offenders and anyone who has a history or record of violent behavior towards children.
7. US-Sex-Offenders.com: This site can search information and addresses for sex offenders in 27 different U.S. states.

Contact Information

Verify addresses and other contact information

1. White Pages: Online People Search destination, with more than 180 million people searchable in our databases.
2. Free Address Lookup: Browse by state or just type in a name to find out where someone lives in the U.S.
3. The Search Advisor: Search the U.S. database on this site to find missing people, do a quick address verification or find your birth family.
4. Addresses.com: This website offers a White Pages search, Yellow Pages search, cell phone caller ID and e-mail lookup.
5. AnyWho: To find a person or a business through this site, you need to type in their land line phone number.
6. MelissaDATA: You can verify and look up addresses on this website, which prompts you to type in a street address, zip code or city.
7. PhoneNumber.com: Conduct a people search or business search on this site, where you can find and verify addresses and phone numbers.
8. Superpages.com: Look up addresses, phone numbers and e-mail addresses on Superpages.com.
9. 411.com: At 411.com, search the white pages or yellow pages, do a reverse phone number check, reverse address check, look up an area or zip code and more.
10. Driver’s License Search: Find court records and driving records by looking up your applicant’s driver’s license here.

People Searches

1. Zaba Search: This free people search and public information search engine features search options by name, phone number or social security number.
2. Free Public Records Directory: Find death records, court records, marriage and divorce records and a lot more on this “absolutely free” site.
3. Yahoo! People Search: Conduct a U.S. phone and address search, reverse phone number check or e-mail search here.
4. Bigfoot: Find individuals or businesses through this site, which can reveal e-mail addresses, phone numbers, addresses and more.
5. Peek You: Peek You is “the smartest way to find people online.” You can find out if someone has any risque pictures or information on their online profiles, on any site.
6. pipl: Brings up social networking profiles, public records, mentions on blogs and the Web