There is a certain amount of information that can be found at the Illinois Secretary of State's website (http://www.ilsos.gov/corporatellc/) for an LLC. The record must include a registered agent, which must be an entity able to accept service of a lawsuit. The record must also include a physical address of the business. Getting to your personal name would take more digging but it is public record. A DBA is trickier -- you may be able to keep your name out of the public realm though taxing...