Verifying a Candidate's Prior Addresses and Why It Changes Which Counties You Search

Most criminal records in the United States are created and kept at the county courthouse, and a background check only finds them if someone searches the right counties. That is why an address history check, sometimes called prior address verification or an SSN trace, is the report we suggest employers run first, before any criminal search. After decades of helping employers order background checks online, we have seen too many searches run on a single county because that was the only address on the application. Here is what the address history report does, why it matters more than it looks, and how to turn it into a search plan. This is general information rather than legal advice; an employment attorney can confirm the rules in your state.

What an address history check actually is

The report traces the names and addresses that have been associated with a candidate's Social Security number over time, drawn largely from credit-header and public-record sources. It typically returns a list of addresses with the approximate years each was in use, along with name variations such as maiden names or alternate spellings. It also doubles as a basic identity check: if the name and date of birth you were given do not line up with the number, you want to know that before ordering anything else. One thing the number itself no longer tells you is where the person has lived. Since June 25, 2011 the Social Security Administration has assigned numbers randomly, so the first three digits no longer indicate the state where the card was issued, as SSA explains. The address trace fills that gap.

People move more often than an application shows

A job application usually asks for a current address and sometimes one prior address. A résumé lists employers, not residences. Yet the Census Bureau reports that 11.8 percent of people moved to a different residence in 2024 alone, according to its geographic mobility estimates. Over a typical seven-year lookback, a candidate may have lived in three or four counties, possibly in more than one state, and the application will mention one of them. A criminal search limited to the current county can be accurate and still miss everything that happened elsewhere.

Why county matters so much

There is no single file that holds every criminal record. A national criminal database search pulls together records from many jurisdictions and is a useful wide net, but its coverage and update frequency vary from one county to the next. A county criminal search goes to the court that actually handled the case and is the primary source. The two work together: the database search is broad, the county search is deep, and the address history is what tells you where to point the deep search.

Turning the address list into a search plan

Once the address history report is back, we suggest building the criminal search from it rather than from the application:

• Search the current county of residence and every county where the candidate lived during your lookback period (seven years is common).

• Add counties where the candidate worked or attended school if the application shows them and they differ from the residences.

• Run a national database search as the wide net, then confirm any hit with a county search in the jurisdiction that holds the case.

• Consider a federal district search covering those counties for positions where financial or federal offenses would matter.

• Search every name variation the trace surfaces, not just the name on the application.

Apply the same plan to every candidate for a given role. Searching one applicant in five counties and the next in one, for the same job, is the kind of inconsistency that is hard to defend later.

Identifiers are what make a hit yours to act on

The address history also protects you from the opposite mistake: acting on a record that belongs to someone else. The Consumer Financial Protection Bureau's advisory opinion on name-only matching states that a consumer reporting agency that matches records using only a first and last name, without identifiers such as date of birth, address or Social Security number, is not using reasonable procedures to assure maximum possible accuracy under the Fair Credit Reporting Act. The addresses and dates in the trace are exactly the identifiers that let a court record be confirmed or ruled out. When a criminal hit comes back, compare its identifiers against the trace before you treat it as the candidate's.

Keep the process compliant

An address history report ordered from a screening company is a consumer report under the FCRA, just like the criminal search it guides. That means you need the candidate's written authorization, on a standalone disclosure, before ordering it, and if anything in the resulting reports leads you to pass on the candidate, you owe them a pre-adverse action notice with a copy of the report before the final decision, as the FTC's guidance for employers describes. Order the trace, build the search from it, confirm hits by identifier, and document the plan you used. That sequence is what makes a nationwide background check actually nationwide.

Employers can order address history, SSN verification, county and national criminal searches and sex offender registry checks online, pay per report with no monthly fees or minimums, on our employment screening page.