State officials on Friday began notifying people affected by the hack, after an investigation by state workers and an independent company found no evidence any information was downloaded from state servers.
“It was just accessed,” said Fallon Pearre, a spokeswoman for the Maryland Department of Labor.
She said that the state does not believe any of the information was misused.
The data had been stored either in an old unemployment insurance database or a database used for an adult literacy program run by the state labor department.
The scope of the breach was much smaller than other recent cyberattacks in Maryland. In May, a ransomware attack crippled Baltimore, suspending many government functions and costing the cash-strapped city roughly $10 million.
The state was among 21 whose election systems were targeted by Russian hackers in advance of the 2016 election.
And Bethesda-based Marriott International announced last fall that hackers accessed travel records for to 500 million guests, one of the largest data breaches in history.
For the most recent hack of state databases, Maryland officials said the state will provide two years of free credit monitoring to people whose information was vulnerable.
Last month, Gov. Larry Hogan (R) signed an executive order creating the state’s first chief information security officer and a new office dedicated to bolstering the state’s defenses.
The state investigation of the hack of the labor department had been underway since April, but officials say the creation of the new cybersecurity post was not related to any particular incident.