If you live in, or near, a state sponsored university or college, chances are they have an agricultural school where they often accept soils for analysis.
Some though had in the past, but do not do it anymore...Ohio State University is one example, they don't test soils from the public.

There are many such testing laboratories in all parts of the U.S. and Canada.
Perhaps the university in your state can inform you whether they do such tests or put you in touch with where it can be done.

For addresses and phone numbers, state colleges are found in the "Government.....State"...pages of your phone directory.

Thanks, I've been getting lab work done by Cornell for decades and am satisfied with their work. Not looking for a lab just a referal to this one because the moneys been paid and the lab work and recomendations made.