Except two Republicans, Todd Huff and David Marks, the legislation was approved by the members of the County Council.
"I want all Baltimore Countians to have equal access to those opportunities that make them more productive citizens, but upon further reflection, I don't know if there are already protections under the law," Marks said in a statement, "I continue to have questions about the legislation, and would prefer for the state to act first on this issue."
Tom Quirk, who introduced the bill, said "everyone deserves to be treated fairly."
"This bill is a human rights bill, and I'm proud of Baltimore County tonight."
The Baltimore sun reports the bill will add both gender identity and sexual orientation to the county's existing anti-discrimination laws, which protect people in the workplace, housing, finance and public accommodations.