Lorraine Easom was last seen a week ago in Harpes Road.
The 55-year-old was reported missing three days later.
She's described as white, 5ft 2ins, has brown shoulder length hair, and brown eyes.
Lorraine has links to Oxford and Kidlington.
Detective Sergeant David Whittle, based at St Aldates police station, said: "We are continuing to conduct enquiries into the whereabouts of Lorraine, who also uses the first name Claudia.
"We are also continuing to appeal for the public’s help in tracing her. I would particularly like to ask local residents to check any gardens, sheds or garages.
"If anyone thinks they may have seen Lorraine, or someone matching her description, please contact police as soon as possible."
Anyone with information about Lorraine’s whereabouts should contact the 24-hour Thames Valley Police non-emergency number 101, quoting reference 444 (11/3).