See TAPN’s State 1099 Filing Requirements to see when filing 1099s is required (it is required in most states), and whether the state participates in the combined federal/state filing program; and see Links to State Tax Agencies for State Reporting Requirements.
Unfortunately, even states that participate in the CF/SF program sometimes require you to file with the state separately anyway. TAPN does not have the details for each state; it provides URLs and phone numbers to contact the states.
It appears that in Michigan, despite its participation in the CF/SF, you do have to file your state copy of 1099-MISC with the state. See the Michigan Department of Treasury's FAQs.
Pennsylvania does not participate in the CF/SF program. Here are some links for Pennsylvania that might be helpful:
- Pennsylvania Department of Revenue 1099-MISC Overview
- A general search for articles regarding 1099 filing in Pennsylvania
Oregon also does not participate in the CF/SF program. Start here. You might have to call the department of revenue at (503) 945-8091.