These are some of the institutional visitors to Marian Apostolate, in alphabetical order:
- Abbott Laboratories
- Adbase Systems
- Adelphi University
- Administracion Nacional De Telecomunicaciones; Montevideo, Uruguay
- African Virtual University, Kenya
- Alaska State Government
- Algonquin College
- Alliance Zagreb Bank Pension Fund, Croatia
- Alta Colleges
- American Standard Water Corporation
- Ameriprise Financial Services
- Andrews & Kurth LLP
- APCO International
- Arlington County Government, Washington, DC
- Armstrong Utilities, PA
- Associated Press, Washington, DC
- Atlantic Health System, NJ
- Australian Catholic University
- Autoexec Computer Systems
- Barton Cotton Holdings, LLC
- Baystate Health, MA
- Belfast Institute of Further and Higher Education
- Bellarmine College Prep
- Bishop’s University
- Boston College
- Boston University
- Braintree Electric Light Department, MA
- Brandimensions
- Broward County Public Schools, FL
- Burton District Hospital, Cheshire, UK
- Buttrey Food and Drug
- Calgary Roman Catholic School, Canada
- Carlow College
- Catholic Diocese, Shreveport, LA
- Catholic Network Australia
- Catholic University of America
- Case Western Reserve University
- CBS Corporation/Viacom (Mass Media Conglomerate)
- Central Michigan University
- Chambersburg Hospital, PA
- Christus Health System, TX
- City of Danbury, CT
- City of Portland, Oregon
- City of San Antonio, TX
- City of Scottsburg, IN
- City of Seattle, WA
- Claremont University Consortium
- Colorado State University
- Columbia University, New York
- Commonwealth of Massachusetts
- Connecticut Hospital & Affiliates, CT
- County of Erie, PA
- County of Los Angeles, CA
- County of Orange, CA
- County of Yakima, WA
- Delgado Community College
- Department of Defense Network Information Center, US
- Dundee College, UK
- Edinburgh University, Edinburgh, United Kingdom
- El Paso Independent School District, TX
- Electronic Arts
- Evangelical Christian Credit Union
- EWTN
- Federal Reserve Board, Washington, DC
- Flowing Wells Schools, AZ
- Fondazione Voce Padre Pio, Italy
- Ford Motor Co.
- Gardner-Webb University
- Genentech, CA
- Gibson, Dunn, & Crutcher LLP
- Gonzaga University
- Goucher College
- Government of South Africa
- Gustavus Adolphus College
- Hawaii Department of Education
- Hewlett-Packard Corporation
- Hillcrest Covenant Church, Overland Park, Kansas
- Holy Ghost Preparatory School, PA
- Holy Name Retreat Center, TX
- Holy See, Vatican City
- Holyoke Gas & Electric Department, MA
- Hope College, Holland, Michigan
- Huntsville Hospital, Alabama
- Iasis Medical Center of Paphos, Cyprus
- Indiana Department Of Education
- Inktomi Corporation
- Iona College
- Jefferies & Co.
- JM Zell Partners, Washington, DC
- JNT Association, Research & Education Network, UK
- Johnson & Johnson
- John Q Hammons Hotel Management LLC
- Joint Stock Co., Lithuania
- Kaiser Foundation Health Plan, CA
- Kern County Superintendent of Schools, Bakersfield, CA
- Knights of Columbus, CT
- Lafayette Consolidated Government, LA
- Lakeway Regional Medical Center
- Law Office of Julander, CA
- Lawrence Berkeley National Laboratory (US DoE)
- Lithonia Lighting
- Loyola University at Chicago
- Loyola University at Maryland
- Loyola University at New Orleans
- Los Angeles County Office of Education, CA
- Los Angeles Unified School District, CA
- Mammut Industries, United Arab Emirates
- Manhattan College
- Maritime Resource Systems, NY
- Marquette University
- Marshfield Medical Research and Education Foundation
- Mary Washington College
- Minnesota State Colleges and Universities
- Mediacom Group Services
- Merced Office Products
- MetroHealth System, OH
- Microsoft Corporation, Beverly Hills, California
- Microsoft Corporation, WA
- Milwaukee Area Technical College
- Mississippi State University
- Morgan Stanley Group
- Mother House, Suore Francescane del Cuore di Gesu, Rome, Italy
- Mount Saint Mary College
- Mount St Michel, WA
- National Aeronautics And Space Administration (NASA), Cape Canaveral, Florida
- National Conference of Catholic Bishops (NCCB), Washington, District of Columbia
- National Health Service, London, UK
- National Jewish Medical And Research Center Corporation, Denver, Colorado
- Navy Network Information Center (nnic)
- New York City Public Schools, NY
- Northern Health Authority, British Columbia
- Northwestern College
- Northwest Ohio Computer Association, OH
- Norwegian University of Science and Technology
- Oblate School of Theology
- Ohio Dominican University
- Ohio State University
- Oshean, Rhode Island Research and Education Network
- Osnovna Skola Ivana Gundulica, Croatia
- Our Sunday Visitor
- Oxford University
- Pace University, Briarcliff Manor, New York
- Phillips Electronics
- Pontifical College Bede
- Purdue University
- Queensland Health, Brisbane, Queensland, Australia
- Quincy University
- R & M Office Furniture
- Regional Educational Media Center 4, TX
- Rensselaer Polytechnic
- Research In Motion (Creators of “BlackBerry,” launched in 1999)
- Resurrection Catholic Church, FL
- Rutgers University
- Rwanda Development Board, Rwanda
- Sacred Heart Catholic Church, Wichita Falls, Texas
- Sacred Heart University
- San Diego County Office of Education
- Sandhills Publishing Co.
- Saudi Arabian Oil Company, Saudi Arabia
- Second Cup, Canada
- Shrewsbury Electric & Cable Operations, MA
- Slovak University of Agriculture, Slovakia
- Society of St Vincent de Paul, Slovakia
- Softbank Corporation, Japan
- Sound Advice Ltd
- South Central Ohio Computer Association
- Southern California Gas Company
- Southwest West Central Service Cooperative
- Spokane School District, WA
- Spring Hill College, Mobile, Alabama, United States
- Staffordshire County Council Infrastructure, UK
- State Library of Louisiana
- State of Illinois
- State of Louisiana Office of Telecommunications
- State of Minnesota
- St Ambrose University
- St Anselm’s College
- St John’s Seminary, MA
- St John’s University
- St Joseph’s College
- St Joseph’s University
- St Louis Catholic Church, TX
- St. Lukes Hospital, Saint Louis, Missouri
- St Maria Goretti Roman Catholic Parish, AZ
- St Mary’s College, Oscott, UK
- St Mary’s Parrish Offices, Mount Angel, Oregon
- St Matthew School, Indianapolis, Indiana, United States
- St Norbert College
- St Olaf Catholic Church, MN
- St Vincent College
- Stanford University
- Starwood Resorts
- State of Connecticut, Judicial Branch
- State of Delaware
- State of Utah
- State University of New York at Brockport
- Stone Ridge School of the Sacred Heart, MD
- Teachers Insurance and Annuities Association
- Technical University of Lisbon, Portugal
- Texas Christian University
- Texas Health and Human Services Commission
- The Collaborative Inc.
- The Emirates Group
- The Maximus Group LLC
- The Methodist Hospital, Houston, Texas
- The New School, NY
- The University of St. Andrews, United Kingdom
- The University of Texas Health Science Center at Houston, Texas
- The Vanguard Group
- Three Village Central School District, NY
- Toronto Dominion Bank
- Tulane County Office of Education
- Travel Systems, PA
- Truman Medical Center
- UGS Corporation
- University Co-op, TX
- University of Alabama at Birmingham
- University of California, Los Angeles
- University of Central Missouri
- University of Dayton
- University of Glasgow
- University of Indonesia
- University of Kent
- University of Malta
- University of Maryland, Princess Anne, Maryland
- University Of Melbourne, Melbourne, Victoria, Australia
- University of Missouri at Columbia
- University of Nebraska at Lincoln
- University of Notre Dame, Notre Dame, Indiana
- University of Portland
- University of Quebec at Montreal
- University Of Santo Tomas
- University of Scranton
- University of St Francis
- University of St Thomas
- University of Steubenville, Finance Department
- University of Texas at Austin
- University of Texas at San Antonio
- University of Texas at Tyler
- University of Toronto
- University of Tulsa
- University of Venda, South Africa
- University of Windsor, Windsor, Ontario, Canada
- University of Wisconsin at River Falls
- USA ISC (Army), Headquarters
- US Capitol Police, Washington, DC
- US Department of Commerce – International Trade, Washington, DC
- US Department of Justice, MD
- US Department Of State, Washington, District of Columbia, United States
- US Foreign Broadcast Information Services, VA
- US Navy Network Information Center, VA
- United States Postal Service, Raleigh, NC
- Utica College
- Vera Bradley Design
- Villanova University
- Virginia Information Technologies Agency, VA
- Virginia State University
- Washington & Jefferson College
- Wechsler Ross & Partners, Brooklyn, New York
- Welsh Assembly Government, UK
- Wisconsin Department of Administration
- WV Department Of Education