Next to the 43rd, the 46th is the most liberal LD
For President, the 43rd and 37th were both 85.2% Obama, the 36th was 81.1%, and the 46th just edged out the 34th (77.5% to 76.6%).
You want to try Governor instead? In descending order, the Inslee percentage was: 37th=80.4%, 43rd=79.8%, 36th=73.7%, 46th=69.7%, 34th=69.1%. Same rank-order, same big gap between the top three and the next two.
I'd discount the 37th somewhat. Yes, their percentage was a whisper above the 43rd, but they have relatively low turnout (81%, versus 85%-88% in the rest of the city) and a much lower number of registered voters (only about 80K, while the 43rd and 46th are around 95K and the 36th edges over 100K).
So the Seattle LDs' "Democraticness" goes in the order (37th), 43rd, 36th, 46th, 34th.