Prostitution-free zones designated by the City Council under Chapter 14B.30. The zones were areas in  which police had probable cause to believe a person committed prostitution  as defined in Section 14B.30.030 of city code. Offenders could be banned from the zone for a  twelve to 18 month period.

In 2007, Mayor Tom Potter allowed Portland's Prostitution Free Zone ordinances to sunset after determining that the law was ineffective.

In recent months, neighbors of the Montavilla neighborhood have begun organizing to mark the one year anniversary since the city dropped the Prostitution Free Zone.  The groups claim that crime has risen since the zone was dropped, and are attempting to push for its reinstatement.