USA:
General:

Fisher Dachs Associates
(Some links to theatre facilities)
Theatre Specs Online
Theatre-Link.com
(General links , a few with thechnical specifications)
Theatre Seating Charts

Alabama:
USA Saenger Theatre, Mobile

Arizona:
Buena Performing Arts Center, Sierra Vista

California:
California State Polytechnic University, Pomona
Crest Theatre, Sacramento
The Flint Center, Cupertino
The Hofmann Theatre, Dean Lesher Regional Center for the Arts at Walnut Creek
Humboldt State University, Arcata
Irvine Barclay Theatre, Irvine
The James Armstrong Theatre, Torrance
Luther Burbank Center for the Arts, Santa Rosa
The Mystic Theatre, Petaluma
University of California at Berkeley, including Zellerbach Aud, Playhouse, Greek Theatre, & Wheeler Aud
University of California at San Diego, Mandell Weiss Theatres
University of California at Santa Cruz

Connecticut:
Garde Arts Center, New London

Delaware:
The Delaware Theatre Company, Wilmington
Three Little Baker's Theatre, Willimgton

Florida:
Center for Performing Arts, University of Florida
The Florida Theatre, Jacksonville

Hawaii
Maui Arts & Culture Center, Kahului

Illinois:
Briar Streat Theatre, Chicago

Iowa:
Fisher Theatre, Iowa State University,
Grinnell College Theatres, Grinnell
University of Iowa, Iowa City

Kansas:
Lied Center, University of Kansas, Lawrence

Maine:
Hutchins Concert Hall at the Maine Center for the Arts, University of Maine, Orono

Massachusetts
The Emerson Majestic Theatre, Boston
The Strand Theatre for the Performing Arts, Dochester

Michigan:
Forest Roberts Theatre, Northern Michigan University, Marquett
Frauenthal Center for the Performing Arts, Muskegon
Lydia Mendelssohn Theatre, University of Michigan,, Ann Arbor
Rozsa Center for the Performing Arts, Michigan Technological University, Houghton

Minnesota:
The Fitzgerald Theatre, Saint Paul
Hamline University Theatre

Missouri:
Leach Theatre, University of Missouri - Rolla
Mary Linn Performing Arts Center, Northwest Missouri State University, Maryville
Missouri Theatre, St Joseph
Truman State University, Kirksville

Montana:
Fort Missoula Amphitheater, Missoula
Wilma Theatre, Missoula

North Carolina:
Appalachian State University - Boone
Diana Wortham Theatre, Asheville
Farthing Auditorium Appalachian State U, Boone
The North Carolina Blumenthal Performing Arts Center, including the Booth, Duke & McGlohon Theatres, Charlotte

North Dakota:
Fargo Theatre, Fargo

New Jersey:
The Edward Nash Theatre, Raritan Valley Community College, Somerville

New York:
Binghamton University Department of Theatre
Dicapo Opera Theatre, New York
Eisenhower Hall, West Point
Indian River Central School District, Philadelphia
John Jay College Theatre, New York
Lucille Lortel Theatre, New York
New York State Theater at Lincoln Center
Oswego State University, Oswego
SUNY Purchase
Tilles Center for the Performing Arts, CW Post Campus, Brookville
Tribeca Performing Arts Center, Manhatten Community College, New York

Ohio:
Aronoff Center for the Arts

Oregon:
Newport Performing Arts Center, Newport
Hult Center for the Performing Arts (Silva Concert Hall & Soreng Theater), Eugene

Pennsylvania:
Academy of Music, Philadelphia
Mandell Theatre, Drexel University, Philadelphia
Bucknell Theatres, Bucknell University
Leffler Chapel & Performance Center, Elizabethtown College, Elizabethtown
Fisher Auditorium at the Indiana University of Pennsylvania

Tennessee:
The Tivolti Theatre, Chattanooga

Texas:
The Paramount Theatre, Abilene

US Virgin Islands:
Reichold Center for the Arts, University of the Virgin Islands (PDF)

Virginia:
Rachel M. Schlesinger Center, Northern Virginia Community College, Alexandria

Washington (State):
The Paramount Theatre, Seattle
5th Avenue Theatre, Seattle
Western Washington University, Bellingham

Wisconsin:
Madison Area Technical College Mitby Theatre
Madison Civic Center, Madison, WI
The Weidner Center - University of Wisconsin at Green Bay

Australia:
Monash University, Australia
WestsidePerforming Arts Center, Mooroopna Secondary College, Mooroopna, Victoria

Canada:
The Banff Centre, Banff, Alberta
The Big Secret Theatre, Calgary Centre, Calgary, Alberta
The Haar Theatre, Grant MacEwan Community College,Edmonton, Alberta

Axis Theatre, Vancouver, BC
Firehall Arts Center, Vancouver, BC
Key City Theatre, Cranbrook, BC
The Orpheum, Vancouver, BC
The Presentation House Theatre, North Vancouver, BC
Queen Elizabeth Theatre, Vancover, BC

Artworld Theatre, Toronto, Ontario
Carleton University, Ottawa, Ontario
Chatham Cultural Centre, Kiwanis Theatre, Chatham, Ontario
The Winchester Street Theatre, Toronto, Ontario

Ireland:
Hawk's Well Theatre, Sligo
The O'Reilly Theatre, Dublin

Italy:
La Scala, Milano

The Netherlands:
Theater Carré, Amsterdam
Melkweg Theatre, Amsterdam

New Zeland:
The Napier Municipal Theatre, Napier

South Africa:
University of the Witwatersrand, Johannesburg

United Kingdom:
Aberystwyth Arts Centre, Wales
Hazlitt Theatre, Maidstone, Kent
Manchester Conference Center
The Plowright Theatre, Scunthorpe
The Rhoda McGaw Theatre, Surrey