This was all taken from the USL website. This doesn't take into account games that didn't report attendance. Of course, Orange County's numbers are inflated, as they had one game that had 2,800, everything else was about 150. I think teams that have about 700 should definitley think about moving up to the PSL. Although I'm thinking teams with 500, if in the right area, could survive in the PSL.

Des Moines Menace 4,475
Kalamazoo Kingdom 1,075
Spokane Shadow 999
El Paso Patriots 966
Nashville Metros 701
Sioux Falls Spitfire 688
Carolina Dynamo 649
BYU Cougars 583
Vermont Voltage 576
Fresno Fuego 552
Colorado Springs 548
West Michigan Edge 545
Ft. Wayne Fever 543
Thunder Bay Chill 517
Reading Rage 514
Williamsburgh Legacy 462
Raleigh CASL Elite 442
Michigan Bucks 436
Cap Cod Crusaders 435
Orange County Blue Star 412
Indiana Invaders 405
Chicago Fire Reserves 403
Yakima Reds 388
Southern California Seahorses 384
Central Florida Kraze 356
Cascade Surge 349
St. Louis Strikers 318
Cocoa Expos 278
New Orleans Shell Shockers 278
West Virginia Chaos 278
Wisconsin Rebels 275
Rhode Island Stingrays 274
Boulder Rapids Reserve 267
DFW Tornados 267
Abbotsford Rangers 264
New Jersey Stallions 246
Memphis Express 230
Austin Lightning 205
Nevada Wonders 189
Lafayette Swamp Cats 171
South Jersey Barons 154
Cleveland Internationals 149
Albany Blackwatch Highlanders 147
Brooklyn Knights 145
Richmond Kickers Future 129
Ajax Orlando Prospects 117
Chesapeake Dragons 116
Kansas City Brass 115
Toledo Slayers 102
Jersey Falcons 99
Bradenton Academics 77
Palm Beach Pumas 38

I think Des Moines and Kalamazoo could be strong candidates to replace teams like Westchester, San Diego and California, based on what I'd seen. They average a couple hundred each. I also think El Paso and Spokane would also be good candidates, I've seen them with turnouts of well over 1,000.
Although I cover the hounds, I also cover the leagues and I pay particular attention to the turnouts.

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Those teams may look good from an organizaiton and attendance stand point. But you really need add another 3 - 4 teams in their region. They are really to far from either coast for it to make sence. In a lot of cases, teams might be better off waiting till they are ready to make the jump all the way up to the A-League and skip the PSL. The exception to this might be teams that are near the Northeast or Mid Atlantic regions.

I can relate

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You're right, but I think Fresno, Colorado Springs and El Paso would make a pretty good western conference.

Out west, we play other PSL teams usually back-to-back nights to save on travel costs and then fill out the rest of our schedule with PDL teams. If the teams could survive the huge travels like E.P. or C.S. to Fresno and vice versa, then they could fill out the rest of their schedule against teams near them.