Lulu - Ross
Manufacturer's - Flynn
Philly Cricket - Tillinghast
Whitemarsh - Thomas

All within 3 miles of each other. All within the second tier of each architect's portfolio.

In the southwest corner of San Francisco, you will find:

1) Olympic Club Lake
2) San Francisco GC
3) Lake Merced
4) Harding Park

Collectively, these courses have hosted US Opens, USGA Amateurs, USGA Juniors, the Curtis Cup and multiple PGA Tour events.

If you stand alongside the 4th green on the OC Ocean course, you can see all four of those courses.  

Prestwick, Troon Old, Troon Portland and Troon Lochgreen probably come into the reckoning, but I don't know who may have designed Lochgreen.  For that matter, who did Portland?

Wingfoot East and West, Quaker Ridge, Fenway

I'm not familiar enough with the greater Atlantic
City, New Jersey area to know how close all of these are, but.......

Hidden Creek       Coore and Crenshaw
Atlantic City CC    Flynn  rev Doak
Twisted Dune       Struthers
Blue Heron          Kaye
Blue Heron          Smyers
Galloway             Fazio
Seaview Bay        Ross
Seaview Pines      Flynn etc

Pretty good architectural variety, some solid courses.

Who designed the New Course and original Jubilee at St Andrews?  Might all four come into the reckoning even though the Eden has been castrated?

St. Andrews clearly qualifies.  TOC God, New Old Tom, Eden and Jubilee see below.  And with #7 nearing completion... should be pretty exceptional.  

What about Palm Springs? Australia?  Florida?  I can't think of any in Ireland, am I wrong?  


From the St. Andrews website.

Now well into its second century of life, the Jubilee Course has developed from a basic 12-hole layout into what many consider to be the toughest test of golf at St Andrews.  

Created on a narrow strip of prime golfing land between the New Course and the sea, the Jubilee was originally intended for ladies and beginners. It was laid out by John Angus junior and made ready in only three months.

The course was named in honour of Queen Victoria, whose Diamond Jubilee fell in 1897. On a full day of celebrations, the Jubilee Fountain was unveiled on the Links and the Jubilee Course was officially opened by Mary Macgregor, wife of Provost John Macgregor, who struck the first drive with a commemorative club made by Old Tom Morris.

18 Holes
Around 1902 David Honeyman, Tom Morris' right hand man, suggested that it was possible to extend the course to 18 holes. This was done in 1905 at a cost of £150.

Further Improvements
Between 1938 and 1946, further improvements were made under the supervision of Willie Auchterlonie, the Open Champion of 1893. He increased the course's length to 6,020 yards and commented that "..some day this will be a championship course".  

A Championship Layout.
In 1988 the re-design of the Jubilee to championship standard was carried out by Donald Steel. The teeing grounds were raised, not only providing wonderful views of the Links, but also exposing the golfers to the winds which sweep in from the bay. Mr. Steel's redesigned course now plays at 6,742 yards and is a real test for all golfers.  

Eden
Opened for play in 1914, the Eden course was designed by Harry S. Colt.

For construction photos of #7.  

http://site.comhttp://www.standrews.org.uk/golf/the_courses/course_no7_toNov05.html

Tiger,

Aren't all four of those courses attributed to Tillinghast? Dan asks for different architects.

TK

Yes, 4 different architects, but there must be 4 in Westchester County based on how many courses you can see flying into La Guardia.  

Any course that you can be teeing off on within 15 minutes of putting the flag in on 18 at the prior course will qualify.  

....although the caliber of the courses might not be equal to many of the previously mentioned,.... but, for the closest physical adjacency by different designers, I would think Barefoot Resort is probably the strongest contender.

Each of the courses touch two others and they are laid out in a circle.

Sorry: I didn't notice the "4" I was thinking two

4 Modern: Kiawah: Ocean (Dye), River (Fazio), Turtle Point
(Nicklaus) Cassique (Watson)

Does anyone else play modern courses?

The string of courses comprising Melbourne's 'Sandbelt' would work, although they are not entirely independent in regards to their architects. Russell worked with Mackenzie on the West course at Royal Melbourne, and Mackenzie was responsible for the bunkering scheme at Kingston Heath.

Woodlands (Banks & Bennett)
Royal Melbourne West (Mackenzie)
Royal Melbourne East (Russell)
Kingston Heath (Soutar)

TK

Not close enough to border each other, but Reynolds Plantation has Nicklaus, 2 by Cupp, Fazio, & Rees Jones with an Engh on the way.  Plus Cuscowilla (C&C) is pretty close to Great Waters.  Also Harbor Club - Weiskopf and Morrish.

Andy

You know what they say about Muirfield Village - eighth best in the world but only fourth best in Columbus.