This is very much an RV park and not really a campground. Seems like a clean little park, but right in the middle of Lynnwood, so if you are looking for a rural setting this isn't for you. 

They offer weekly and monthly rentals, so this is more of a long-term sort of place. 

Website: Northsound RV Park

​Requirements from their site: 

• Your travel trailer must be year 2005 or newer 
• Pet friendly(limit 2) not to exceed 25 lbs. Aggressive breed restrictions apply. 
• No conversion vehicles - sorry van and bus life people 
• No trailers larger than 35' long, ideally.