Officials say anyone who was in five locations in Mill Woods, a neighbourhood in southeast Edmonton, at specific times earlier in March, may be at risk of developing the contagious disease, which is spread through the air.
The locations are a pharmacy, dental clinic, two medical clinics and a medical lab in Millbourne Shopping Centre.
Health officials say people who haven't been vaccinated against measles or who haven't had the disease are at the highest risk.
Symptoms of measles include fever, cough, runny nose or red eyes, and a red blotchy rash that appears three to seven days after fever starts.
The rash typically begins behind the ears and on the face, spreading down to the body, and finally to the arms and legs.
There is no cure for measles, but it can be prevented with vaccination.
Note to readers: This is a corrected story. A previous version said times in June.Suggest a correction