The benefit of living in a free country is that all these stats are available.

https://ipad.fas.usda.gov/countrysummary/Default.aspx?id=US&...

We'll see if the Trump USDA publishes this stuff next year.

Yeah, that reports acreage and production (estimated), which isn't the same thing as "how many farmers?". It does confirm that soybeans are down farther than they have been in years. I'm sure the more granular data is there somewhere, but I poked around for a few minutes and did not find it. Ah, well. Thanks for trying.