Note: Ecclesiastical peers must have had the title for at least five years to be listed here to avoid clutter.
(1209-1226) (1226-1242) The Duchy of Brittany was perhaps the feudal state with the most independence from France in the 13th century and it had several viscounts.
In Particular Bearn (and Brulhois) was almost an independent state which preferred to honor its de jure vassalage to England (as the duke of Aquitaine) rather than to the King of France who would be a far more imposing overlord due to his proximity.
[2] The Count of Champagne had viscounts in his county (which was quite independent of France, but whose interests were generally the same in the 13th century).
[11] The Counts of Provence who were part of the Holy Roman Empire (and had not fealty at all to the kingdom of France) had at least one viscount.