What I'm hearing is that Presbyterians are more organized and united (who would have thought, governmentally!), and therefore easier to count; Baptists are much harder to quantify. I was hoping there would be something statistical out there! But thank you all for your help - I'm honestly surprised that PB thinks there are more Presbyterians. Where I'm at, Reformed Baptists far far outweigh the Presbyterians in number.
This map is over 5 years old, but it includes confessional Baptist congregations, for what it's worth.
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Is there an alliance like NAPARC for Calvinistic/Reformed Baptists?
I don't know if the requirements of the Alliance of Confessing Evangelicals, "affirmation of the Cambridge Declaration and an evangelical creed or confession" would be a good standard.