Ms Everard, 33, was last seen at a friend's house in Clapham, London, on the evening of March 3, which she left at around 9pm.
She is thought to have left Leathwaite Road through a back gate and walked across Clapham Common and was expected to arrive home around 50 minutes later, but she has not been seen or heard from since.
Detective Chief Inspector Katherine Goodwin, who is leading the Metropolitan Police's investigation, said: "This is definitely a missing person investigation at the moment but I remain open-minded as to all possibilities in the investigation."
Providing an update to the media outside Scotland Yard in central London, Ms Goodwin said efforts to find Ms Everard continue "at pace".
She said: "We are currently knocking on doors. We've spoken to over 750 different people and addresses have been visited.
She said police had reviewed hours of CCTV around Ms Everard's movements on the night she was last seen.
Ms Goodwin appealed for anyone with more footage to come forward, particularly people with a dash cam, such as delivery drivers, who may have been driving along Poynders Road at around 9pm on Wednesday.
"The evidence that you have on your dash cam could be absolutely vital to finding Sarah," she said.
Anyone with information should call 101 quoting CAD 3309/06MAR, or call the Missing People charity anonymously on 116 000.