My company uses [Remotely](https://www.remotely.works/). They source talent across Latin America (mostly Brazil, but other countries as well). Expect to pay well for the best talent (obviously). My coworkers sourced through Remotely are all extremely good.
The time zone difference is not a major problem for us, and I am in PST (the US part of my company is mostly EST & CST). There is a large actual time zone difference with Brazil, but all of our contractors tend to be night owls (we are clear about where we are, if they weren't at least slightly night owls, they wouldn't choose to work with us). If you keep core working hours in US EST, you hopefully have morning larks among your Washington state employees as well to make it easier.
Things also depend on the specific foreign country, and what other business your company wishes to transact in that country. My company has (I believe) direct employees in many jurisdictions, including in Europe. But for Latin America, I believe (almost) everything is through Remotely.
The time zone difference is not a major problem for us, and I am in PST (the US part of my company is mostly EST & CST). There is a large actual time zone difference with Brazil, but all of our contractors tend to be night owls (we are clear about where we are, if they weren't at least slightly night owls, they wouldn't choose to work with us). If you keep core working hours in US EST, you hopefully have morning larks among your Washington state employees as well to make it easier.
Things also depend on the specific foreign country, and what other business your company wishes to transact in that country. My company has (I believe) direct employees in many jurisdictions, including in Europe. But for Latin America, I believe (almost) everything is through Remotely.