If you incorporate, you probably need to include your by-laws as part of the filing. There will be a state agency responsible for handing incorporations - both regular and non-profit. This is a key part of setting up a business in your state, so it's usually easily found. There's often a link on the main home page of your state. (
www.state.xx.us - substitute your state abbreviation for the xx). Either you will see a link in the business area or there should be a search field.
You can also search via Google. But note - you'll get a lot of hits for businesses and lawyers that handle incorporation for a fee. Incorporating a PTO is generally a very simple process (if that is what you are trying to do). The state typically provides a sample template for the Articles of Incorporation that's about 1 page long and there's usually a small filing fee. So it's unlikely you'd need to PAY anyone to handle an incorporation.
If you aren't seeking to incorporate, I doubt the state wants copies of your bylaws. (Unless you are already incorporated and filing an update. If so, it would be the same agency.)