According to the study, Washington is in the running for a potential new seat but it is a long (very long) shot. In all instances, the numbers will be close. From the report:
"A review of the last 5 seats/ next 5 seats calculations demonstrates the extreme closeness and volatility inherent in the 2010 population projections. At this point in time there are 13 seats from the same number of states that are vying for the last six seats in the 435 member congressional chamber.
"Six states are close to gaining an additional seat (Florida – 27th; North Carolina – 14th; Oregon – 6th: South Carolina – 7th; Texas – 36th and Washington – 10th), while seven states are very close to loosing a seat (California – 53rd; Illinois – 19th; Louisiana – 7th; Minnesota – 8th; Missouri – 9th; New York – 28th; Pennsylvania – 18th)."