I used
QueryTracker.net AND Google. I then visited each website, checked out submission guidelines and contracts, where available. I then sent a query to them exactly as I had to a whole lot of agents. I then got SIX responses asking for partials or fulls. Out of the fulls, I actually came up with three to look into further.
I notice that your research didn't include the first and most obvious thing to do; look at who published the books in your genre that you like to read.
I notice also that your research didn't include--not that you mentioned, at least--actually
buying books from any of these publishers and reading them to see if your book fit in/how they were edited/if you thought they were any good/etc.
I recently finished a 65,000 word YA fantasy and I'm trying to find a publishing house to submit it to. I tried Google, but I'm not having much luck there. I was hoping somebody who'd had such a book published might point me in the right direction. Thanks.
See above. Who publishes the books you like to read, in your genre? See what their submission requirements are, and follow them.
Remember, anybody with some software can set up a website and call themselves a publisher. That doesn't mean they know what they're doing, or that they can select publishable books, or edit books, or sell books, or keep accurate records and issue royalty checks and all of that. And it certainly doesn't mean being "published" by them counts as any kind of publishing credit to the industry as a whole.