These are all hole the the wall places, but have really great food.
1. The first on is a "Taco Bus" off of 164th in Lynnwood/Mill Creek Area, it's parked in a Shell Station parking lot (the second Shell station on 164th, going east bound towards Mill Creek) and has a huge selection of Mexican Tortas, much larger than normal Taco Truck fair. They have breakfast Tortas with eggs, cheese, ham, bacon, sausage, hotdog, etc, along with the normal Carne Asada and Pork Tortas. Served hot, on fresh Mexican bollios (the torta bread). All the torta choices are posted on the bus windows. They also serve normal stuff, tacos, burritos, quesadillas, etc. The tortas are a great find though, diff from most other places. Expect to wait though, the food is great, and the popularity of this place proves it!
2. The second place is in the back of a Mexican store called Fiesta Latina on the corner of Everett Mall Way and Hwy 99 in South Everett. They have normal taqueria/taco place stuff, but their burritos are the best I've had at any place. Stuffed with carne asada, great rice (not dried or bruned like you get in some places), great flavor beans, the other normal burrito fillings, but something is just better tasting, the best I've had from small taquerias.
3. The third place is even further north, it's in a Shell station deli area, off of the 116th st exit, on the corner of 116th and State St in Marysville. It's called El Patio and the gentlman there, named Victor makes some great Chile Colorado and Chile Verde plates and burritos. He makes it all by hand, right there in front of you when you order. Great, authentic flavor, and he really takes pride in what he serves. He'll tell you lots of stories too, if he's not too busy!