Most of the razor clamming on the coast is in Clatsop County (Warrenton to Cannon Beach). These beaches have the most stable populations of razor clams. There are other beaches that support razor clams including (north to south): Short Sands (Oswald West State Park); Cape Meares beach; Agate Beach; North Beach and South Beach (Newport); Waldport beach; North Umpqua Spit; Bastendorff beach and North Spit (Coos Bay); Whiskey Run (Bandon); and Meyers Creek beach (Gold Beach), but about 95 percent of the razor clamming is on Clatsop County beaches.
Razor clamming is open on Clatsop beaches from October 1 to July 14. The most popular times for clamming is during the spring and summer, when tides are lowest. There are some minus tides during daylight hours this year in November and December that would be your best opportunity this year, so check a tide table for those dates. Tidal predictions for the north jetty of the Columbia River would be the most accurate for Clatsop beaches.
A license for recreational clamming is required through the Oregon Department of Fish and Wildlife (ODFW) and clammers are limited to the first 15 clams taken. The ODFW website can offer more information on licenses and regulations. I don’t know of anyone who offers razor clamming as an activity commercially.
Hope this helps and happy clamming!