State population of 7.8 million, so that is approx 5 percent of the State population.
For the whole country that would extrapolate to 17 million, in 2020, before the big surge of the last couple of years.
Wow - so I bet there are 350,000 illegals in Washington State. Some “official” reports say about 11 million illegals in the USA in 2021. But I’m sure that is under-reported and could easily be your 17 million or more.