The alphamegalog of the cities of Vermont lists the largest city in Vermont for each letter of the alphabet. In this case, ‘largest’ is based on population within the city proper.

Arlington
Burlington
Castleton
Derby Line
Essex Junction
Fair Haven
Graniteville
Hardwick
Island Pond
Johnson
Killington
Lyndonville
Montpelier
Newport
Orleans
Poultney
Quechee
Rutland
South Burlington
Troy
Underhill Flats
Vergennes
Winooski
(no X)
(no Y)
(no Z)