Cool link. For my zip 94618 the population of the 100-mile radius 10,516,300.
Anyway, this sort of reminds me of Department of Commerce Economic Areas(EA) except EAs are about commerce and trade
Largest Economic Areas(EA)by Population, 2009
New York-Newark-Bridgeport 23,290,689
Los Angeles-Long Beach-Riverside 19,716,406
Chicago-Naperville-Michigan City 10,531,781
San Jose-San Francisco-Oakland 9,715,968
Washington-Baltimore-Northern VA 9,279,882
Boston-Worcester-Manchester 8,341,507
Dallas-Ft Worth 8,073,237
Atlanta-Sandy Springs-Gainesville 7,630,834
Philadelphia-Camden-Vineland 7,047,877
Detroit-Warren-Flint 6,915,601
Houston-Baytown-Huntsville 6,798,653
Miami-Ft Lauderdale-Miami Beach 6,252,464
Minneapolis-St Paul-St Cloud 5,271,904
Phoenix-Mesa-Scottsdale 4,939,644
Seattle-Tacoma-Olympia 4,682,642
Cleveland-Akron-Elyria 4,592,908
Orlando-The Villages 4,464,397
Denver-Aurora-Boulder 4,131,266
St Louis-St Charles-Farmington 3,389,150
Indianapolis-Anderson-Columbus 3,389,007
Raleigh-Durham-Cary 3,209,499
Portland-Vancouver-Beaverton 3,119,883
San Diego-Carslbad-San Marcos 3,053,793
Interesting how things can change in 40 years.
Economic Areas(EA) by Population, 1969
New York-Newark-Bridgeport 20,159,109
Los Angeles-Long Beach-Riverside 10,701,471
Chicago-Naperville-Michigan City 8,667,653
Boston-Worcester-Manchester 6,670,237
Detroit-Warren-Flint 6,566,143
Philadelphia-Camden-Vineland 6,071,629
Washington-Baltimore-Northern VA 5,846,068
San Jose-San Francisco-Oakland 5,777,383
Cleveland-Akron-Elyria 4,787,475
Minneapolis-St Paul-St Cloud 3,573,139
Pittsburgh-New Castle 3,375,085(2,876,342 in 2009)
Dallas-Ft Worth 3,309,763
Atlanta-Sandy Springs-Gainesville 3,080,679
St Louis-St Charles Farmington 2,961,869
Houston-Baytown-Huntsville 2,708,332
Indianapolis-Anderson-Columbus 2,647,322
Miami-Ft Lauderdale-Miami Beach 2,372,803
Seattle-Tacoma-Olympia 2,354,667
Denver-Aurora-Boulder 1,747,727
Raleigh-Durham-Cary 1,636,122
Portland-Vancouver-Beaverton 1,565,354
San Diego-Carlsbad-San Marcos 1,340,989
Orlando-The Villages 1,271,851
Phoenix-Mesa-Scottsdale 1,235,200