According to this Wikipedia article on fallout shelters
Germany has protected shelters for 3% of its population, Austria for 30%, Finland for 70%, Sweden for 81% and Switzerland for 114%
Above Wikipedia article also mentions a plan in USA to shelter millions of people. The article states (under the heading "North America"):
In November 1961, in Fortune magazine, an article by Gilbert Burck appeared that outlined the plans of Nelson Rockefeller, Edward Teller, Herman Kahn, and Chet Holifield for an enormous network of concrete lined underground fallout shelters throughout the United States sufficient to shelter millions of people to serve as a refuge in case of nuclear war.
The Wikipedia article does not state whether construction on above shelters was ever started. The next sentence just says that:
The United States ended federal funding for the shelters in the 1970s.
Above sentence is sourced from this article at cnbc.com. My reason for excluding New York from this question is because this CNBC article does explain that New York did (in the past) have fallout shelters to house up to 11 million people.
Did any U.S. states or cities outside of New York ever make a decision to build fallout shelters for their population?