Well, you know that I live in Belgium, Heist-op-den-Berg, somewhere near Mechelen. I know several Belgian guys that shave with a straight. In fact, I think Straight Razors are, in comparison with many other countries, more or less popular in Belgium. But I know only few people who use the Internet to communicate with peers about it. The absence of a Dutch-speaking forum has probably something to do with that. I regularly meet with a few guys who shave with a straight razor. A few of them have a membership at one of the major shaving forums, but none of them is actively posting.
On Coticule.be we have 14 Belgian and 7 Dutch members. Just for reference, United States members are over 125.