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What is the lowest rank in the Hereditary peerage?
The ranks of the Peerage in most of the United Kingdom are, in descending order of rank, Duke, Marquess, Earl, Viscount and Baron.
How does one address a baron in the Hereditary peerage?
What is the next higher rank after baron in the Hereditary peerage?
After the rank of Baron is Viscount.
How many Viscounts are there in the Hereditary peerage?
As of 2019 there are 112 Viscounts.

Question: Are there set numbers of each rank in the hereditary peerage?
Self-contained rewrite: Are there set numbers of each rank in the Hereditary peerage?