Does a parking ticket affect insurance?

Typically not. However, your State law may provide that once you accumulate a given amount in unpaid parking fines, your license is subject to suspension. A license suspension is more likely to have an effect on insurance than parking ticket as such.

All of that said, parking tickets are usually within the jurisdiction of municipalities, rather than states. Therefore, odds are there will be no effect. Nonetheless, you will want to check your state's statutes for verification. The Insurance Code of your state would be the first place to look, as it defines the factors that an auto insurer may consider in determining premiums.