Early on I think it is fair to say that the US Amateur was considered the much bigger event than the US Open. I am not sure exactly when this perception began to change. For the first three years the US Open was only 36 holes, and was played the day after the US Amateur finished, on the same course. I don't remember the exact source, but I recall reading one period paper which stated that the Western Amateur was second in importance only to the USOpen.
. . . here is a list of the courses the Am was played on during that time frame.
1910 The Country Club William C. Fownes Jr. (Oakmont) United States 4 & 3 Warren Wood (Homewood,
1909 Chicago Golf Club Robert A. Gardner United States 4 & 3 Chandler Egan
1908 Garden City Golf Club Jerome Travers United States 8 & 7 Max H. Behr
1907 Euclid Club Jerome Travers United States 6 & 5 Archibald Graham
1906 Englewood Golf Club Eben Byers United States 2 up George Lyon
1905 Chicago Golf Club Chandler Egan United States 6 & 5 Daniel Sawyer
1904 Baltusrol Golf Club Chandler Egan United States 8 & 6 Fred Herreshoff
1903 Nassau Country Club Walter Travis United States 5 & 4 Eben Byers
1902 Glen View Club Louis N. James United States 4 & 2 Eben Byers
1901 Atlantic City Country Club Walter Travis United States 5 & 4 Walter Egan
1900 Garden City Golf Club Walter Travis United States 2 up Findlay S. Douglas
1899 Onwentsia Club H. M. Harriman United States 3 & 2 Findlay S. Douglas
1898 Morris County Golf Club Findlay S. Douglas Scotland 5 & 3 Walter B. Smith
1897 Chicago Golf Club H. J. Whigham Scotland 8 & 6 W. Rossiter Betts
1896 Shinnecock Hills Golf Club H. J. Whigham Scotland 8 & 7 Joseph G. Thorp
1895 Newport Country Club Charles B. Macdonald United States 12 & 11 Charles Sands
. . . Now, I presume that by 1895, CBM played his golf out of Chicago Golf. And I know where the Egans played their golf (Exmoor) and I know that Whigham played at Onwentsia before moving back east. Obviously, Travis played out of Garden City and Behr played out of Lakeside. and Fownes is obvious, too. Findlay S. Douglas was a a big deal and a founding member of NGLA, but I have no idea where he played at the turn of the century when he appears to have been a stud. But that's pretty much all I know.
Who here can fill in the blanks. Who here knows where the rest of these guys played their golf ?
I was curious about Shivas' question so I looked it up their reported clubs for the time period in which they made the finals . . .
W. C. Fownes - Oakmont, Pittsburg, PA
Warren K. Wood - Homewood, IL
Robert A. Gardner - Hinsdale, IL
H. Chandler Egan - Exmoor, IL
Jerome Travers - Montclair, NJ
Max Behr - Morris County, NJ
Archibald Graham - New Jersey CC, NJ
Eben M. Byers - Allegheny CC, Pittsburg, PA
George Lyon - Lambton GC, Toronto, Canada
D.E. Sawyer - Wheaton GC, IL
Fred Herreshoff - Ekwonak, VT*
L.N. James - Glen View, IL
Walter Travis - Garden City, NY
Walter Egan - Exmoor, IL
Herbert Harriman - Meadow Brook, NY
Findlay Douglas - Fairfield, CT
W.B. Smith - Onwentsia, IL
H.J. Whigham - Onwentsia, IL
W. Rossiter Betts - Shinnecock Hills, NY
H. G. Thorp - Cambridge GC, MA
Macdonald - Chicago GC, IL
Charles Sands - St. Andrews GC, NY
*Herreshoff also played out of Garden City (and later NGLA) but was listed as playing out of Ekwonak at the 1904 Am.
[Both H.J. Whigham and Findlay Douglas were Scottish. CBM was born in Ontario, raised in Chicago, but learned the game in Scotland in his teens. Travis was Australian but learned the game in the US.]So, in the first 16 US Amateurs through 1910, there were 22 winners and runners-up through 1910, nine (9) played out of the Chicago area, four (4) out out of New York, three (3) out of New Jersey, two (2) out of the Pittsburg area, and one (1) each out of Connecticut, Massachusetts, Vermont, and Toronto, Canada.
It may be overly generous, but if we credit Herreshoff to Garden City, and consider New York, New Jersey, and Connecticut all to me the New York City area, then it is Chicago and New York with nine (9) each, Pittsburg with two (2).
Not sure what it says about golf architecture, but the Chicago area courses were certainly producing more than their fair share of top Amateurs.