Gorenberg said in a statement that when appearances don't appear to match gender markers on ID cards, people "endure insults and psychological trauma that could largely be averted if they had an option to use a gender marker that does not contradict who they are".
Whereas gender on licenses is usually marked with an M or F, or residents now have the option of marking X to indicate not specified, which includes being non-binary.
The rule was inspired by Portland resident Jamie Shupe, an army veteran who became the first American to legally change their gender to non-binary, thanks to a ruling by an OR circuit court past year.
"I've trembled with the fear of failure and cried tears until I had no more tears to cry, because of the magnitude of what's been at stake - and now won", Jamie Shupe, who in June 2016 became the nation's first person to legally change his gender to non-binary, told NBC News. Shupe was the first person in the United States to successfully petition for a non-binary gender classification, however, since then several others have received non-binary markers through the courts.
In addition to "F" and "M", people will be able to choose "X".
OR officials said they got little opposition to the change at a public hearing or in comments.
Earlier this month, Gov. Kate Brown signed a bill making it easier for transgender residents to shield changes they make to their birth certificates, with the aim of mitigating potential discrimination from employers or landlords, making or the second state (after California) to pass such a law.
As OPB's Kristian Foden-Vencil reported a year ago, several other countries recognize a third gender, including India, Pakistan, Australia and Germany.
One commissioner said, "I hope those who will use "X" as an identifier will feel an element of comfort moving forward". The American Medical Association's House of Delegates passed a resolution just this week calling for improved public education about the "medical spectrum of gender identity", necessary because gender is "incompletely understood as a binary selection". I'm a mixture of both.
A 2015 survey of more than 27,000 transgender people across all 50 states found that 68 percent of respondents didn't have an ID reflecting their preferred name or gender.
Earlier this year, the Canadian province of Ontario implemented the option of an X gender on licenses. "I consider myself as a third sex".