First, What state? Then you can find one on your own. Walk in, ask them for an agent that deals with business. If they only sell auto & home policies, walk out. When you do find a business agent , tell the agent what you do and give a copy of the insurance requirements from the prime to the agent. Ask him what your workers comp code is. If he answers with out looking it up, chances are very high you have found a good agent. If he has to look it up, an acceptable agent. If he has no idea what you are talking about, leave and find another agent.
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