Creationism seems to wax and wane in the US. I'm not sure entirely why - it could be for a number of reasons.
At the moment, US
public school teaching standards seem to be moving away from creationism, and ID (which to an outsider's perspective has completely failed to make an impact). With a few exceptions, school board decisions and education standards seem to have gone against creationism (or "academic freedom" bills) over the past decade, and all legal cases I can discover have ruled against teaching creationism in public schools.
Academic freedom bills - read: we need space to teach non-scientific ideas in science class, and false equivalency/controversy is the only way we can get this through - got knocked down everywhere except Tennessee and Louisiana.
The big news is that the two major text book markets - Texas and California - both had legal cases in the past 10 years that decided against creationism and ID in text books. In addition, the attempts by creationists to populate state school boards seems to have been overcome and/or resisted in these important markets.
So, on a public education front, there is hope for the US.
The concern is outside of the regular public school systems. Charter schools in particular. US religious schools are free to teach what they want, and that's fine (within limits). However, US charter schools are getting public funds and teaching a religious doctrine. There's also those not easy to qualify systems, like the Texas 'Responsive Education Systems', which again get public funding and teach creationism.
Then there's homeschool.
It's hard to quantify exactly how many students are receiving creationist education from homeschool. There are anywhere from 1.8 to 2 million homeschool students in the US, up from about 1 million in the early 2000s.
Firm numbers of how many homeschooled students are taught creationism, or some variation of it, are even harder to come by. When you can get them, they are
very broad.
I've seen estimates that range from just over a quarter of all US homeschool students are taught creationism to over two thirds of students. With a variance that wide, it means either the data is completely inadequate or people are just guessing based on small samples (which is basically the same thing).
Given that homeschooling is dominated by white, evangelical protestants from the Bible belt and Midwest states (around 65% of all homeschool students fit into this category) I'd hazard that the proportion is more than half of all homeschool students are taught creationism in one form or another. There's a reason why ICR and Answers In Genesis provide "resources" for homeschooling.
Anecdotally though, there does seem to be some sort of movement away from the sort of biblical literalist, young earth creationist texts in the homeschool movement. Organisations like NASH and other secular homeschooling organisations have been working with major scientific and teaching bodies to develop a series of textbooks that match, or are even better than, current public school standards.
There's hope yet.