Seattle continues to be the red-headed step-child of the Supercharger map. I can't think of another city of its size without a Supercharger within 70 miles.
I wondered about this, so I worked it out. Here are the top 25 US cities by population, their population, and the distance to the nearest supercharger. (most of these are part of a metro area but for simplicity I ignored that.)(data is from wikipedia and supercharge.info) Plus' suspicion is almost correct: Seattle is indeed the biggest city to not have a supercharger within 45 miles, but El Paso (with about the same urban population but a much smaller metro area) has to go 445 miles.
NYC 8.5M 0 mi(JFK)
LA 4.0M 0 (several)
Chicago 2.7M 0
Houston 3.0M 0
Philadelphia 1.6M 40 miles to Newark, DE
Phoenix 1.6M 30 miles to Buckeye, AZ
San Antonio 1.5M 44 miles to San Marcos, TX
San Diego 1.4M 0 miles
Dallas 1.2M 43 miles (one is going in in Arlington)
San Jose 1.0M 12 miles (Mtn View AND Fremont)
Austin 930K 35 miles (San Marcos)
Jacksonville 870K 33 miles (St Augustine)
San Francisco 860K 20 miles
Indianapolis 850K 0
Columbus 850K 9 miles
Ft Worth 830K 40 miles
Charlotte 830K 0 miles
Seattle 680K 70 miles (Burlington)
Denver 680K 0 miles
El Paso 680K 445 miles (Albuquerque)
Detroit 680K 35 miles (Ann Arbor)
DC 670K 0 miles
Boston 670K 15 miles (Dedham)
Memphis 660K 145 miles (Miner, MO)
Nashville 650K 0 miles
--Snortybartfast