If you plan on selling alcohol, firearms, food, and tobacco or will be opening a media business such as a radio or television station, the Federal government requires that you obtain a license to do so, and they must be posted. Visit the website for the Alcohol, Tobacco, Firearms and Explosives (ATF) division to learn how to obtain specific licensing. State agencies may require additional licenses for food or alcohol sales.
For broadcasting licenses, visit the Federal Communication Commission (FCC) on how to apply for or renew your license.
Car dealerships and used car lots are required to obtain what is called a dealer license from the Dealer Licensing Bureau in each state. This process also requires obtaining a dealer bond as well as having an inspection of the location by the fire department and the local motor vehicle division.
Contractors must also be licensed in the state where they work and in some areas must obtain and post building permits on the jobsite depending upon the size of the job. Every state is different, so your best bet is to do a Google search on “(state’s name) contractor licensing board." These are very important! For example, the State of California offers licenses in 43 different categories so make sure you choose the right permit or license based on the type of contractor you are—electrical, plumbing, general, etc.
Pharmaceutical licenses are also regulated by each state; if drug manufacturing is your business, a license on the federal level must be obtained from the ATF. Pharmacists and physicians must also obtain and display state licenses but are not required to post degrees from universities.