Viscount - A Viscount is a normally senior Baron and is appointed by the King to oversee a province.
Lord Mayor - The Leader of a City, it fits somewhere between Lord and Baron in the order of precedence. The Lord Mayor might be elected (Independent City) or appointed by a noble.
Mayor - The Leader of a town, it has the same precedence as a Lord Dominus. The Lord Mayor might be elected (Independent Town) or appointed by a noble.
Governor - Appointed to lead a town, city or small region, on behalf of a Noble, it has the same precedence as a Mayor or Lord Mayor, depending on the size of the holding.
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Lord Advisor - Appointed by Nobles and Lord Mayors to help run their cities and estates. They generally rank as Lord Dominus in the order of precedence.
Advisor - Appointed by lesser Nobles and Mayors to help run their towns and estates. They generally rank as Lairds in the order of precedence.
Elder - Senior Person in a subsidiary village or hamlet - they represent both the people of the settlement and their overlord.