Customization: Can they build a custom list for you?

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Pricing & Usage Rights: What's the cost, and are there any limitations on how you can use the data?
Free Sample/Trial: Request a sample to assess data quality before committing.
LinkedIn Sales Navigator:

An excellent tool for manual prospecting netherlands mobile database and building highly targeted lists. You can filter by:
Job Titles: "Insurance Agent," "Insurance Broker," "Financial Advisor" (many sell insurance), "Underwriter," "Claims Adjuster," etc.
Industries: "Insurance," "Financial Services," "Investment Management."
Geography, Seniority, Company Size, Keywords.
You can then save leads, organize them, and send InMail messages or connect directly.
Industry Associations & Regulatory Bodies (for research, not direct lists):

National Association of Insurance Commissioners (NAIC): Provides regulatory information, and state insurance departments often have public databases of licensed agents (though usually not with direct contact info for marketing).
National Association of Professional Insurance Agents (PIA): Offers member directories.
Independent Insurance Agents & Brokers of America (IIABA - Big "I"): Member directories.
National Association of Health Underwriters (NAHU): For health insurance professionals.
State-specific Insurance Departments: Often maintain public records of licensed agents, which can be used for verification or building initial target lists for manual research.