"All the advertising agencies," so it is said, but U.S. Census Bureau data and the New York Yellow Pages indicate about what percentage of all U.S. agencies are located there?

Name: "All the advertising agencies," so it is said, but U.S. Census Bureau data and the New York Yellow Pages indicate about what percentage of all U.S. agencies are located there?
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According to the U.S. Census Bureau data and the New York Yellow Pages, about 20 percent of all U.S. advertising agencies are located in New York.

"All the Advertising Agencies," So It Is Said, but U