The state file is the first pass: licensing authority, reciprocity posture, workers' compensation threshold, bond notes, and renewal rules. It should not be treated as the final filing answer for a job site.
Use state boards for licensed trades, then confirm the municipal code office for permits and inspections.
Primary licensing body
Maine Office of Professional and Occupational Regulation; local building departments is the main statewide reference point for this file. County and municipal departments may still impose separate registration, permit, insurance, inspection, or bond requirements.