I've been seeing a number of brown lipped snails and pacific sidebands around the Seattle area recently. But there are some smaller ones as well. Most of the common ones are introduced, but pacific sidebands are a native species with a shell that gets a bit bigger than an inch across.
If you go to the beaches at low tide right now you'll likely see moon snail eggs.
Here's a PDF guide to Snails and slugs in Oregon:
https://www.oregon.gov/oda/shared/documents/publications/ipp...
The Burke museum has an iNaturalist project for snails and slugs, you could use it to see where to look. Or even contribute!
https://www.inaturalist.org/projects/slime-pacific-northwest