Oh there's plenty of Spanish here in Missouri, but they are definitely elusive. Congratulations on finding yours. They tend to spoil you for newer silver. After a few Spanish, it's hard to get quite as excited as before over a Mercury when one pops out. I'm up to 5 Spanish in SE Missouri and am hoping to hit a few more this year yet. I can remember almost exactly, to within a few inches probably, where I found each and every one of them! (And thanks to good records....even the date of the find). We have to remember that our state was part of the Louisianna purchase. Before that time, most of the state was traded back and forth between Spain and France. Lots of Colonial history here, just hard to find sites that old which haven't been built over. Look for farms in your area that had homesteads on them, particularly around springs or fresh running water.
GL and HH.