Costco Newmarket Address 107 Harry Walker Parkway Newmarket Ontario L3Y 7B3 Canada (289) 319-4500 Loading... No Records Found Sorry, no records were found. Please adjust your search criteria and try again. Maps failed to load Sorry, unable to load the Maps API. Get Directions Visit the Costco warehouse in Newmarket, ON. Address: 107 Harry Walker Parkway, Newmarket, ON L3Y 7B3. Find The Raw Pack’s premium Raw Dog Food and Raw Cat Food in store today!
