In United States, there are over 1500 universities which recognize IELTS. The list will be too long to mention here. However, I’ll mention some top ranked universities which accept applications from students with IELTS.

Here is the list:

Arizona State University
Arizona State University
Arkansas State University
Arkansas Tech University
Boston University
California State University,
Colorado State University
Concordia College
DeVry University
owa State University
Kansas State University
Massachusetts Institute of Technology
Miami University
Michigan State University
Oklahoma State University
Plymouth State University
San Francisco State University
Seattle University
University of Chicago
University of Connecticut
University of Delaware
University of Florida
University of Georgia
University of Idaho
University of Iowa
University of Maryland
University of Memphis
University of Miami
University of Michigan
University of Minnesota
University of Nebraska
University of New Mexico
University of North Alabama
University of North Carolina
University of North Dakota
University of Oklahoma
University of Oregon
West Virginia University
Wichita State University
Yale College

These are some of the universities in United States which recognize IELTS too. The complete IELTS recognition list is available at IELTS official website, here:
http://www.ielts.org/pdf/USA_Recognition_List.pdf

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List of IELTS accepting Colleges and Universities in US-

University of California Berkeley
University of Chicago
University of Connecticut
University of Delaware
University of Florida
University of Georgia
University of Idaho
University of Iowa
University of Maryland
University of Memphis
University of Miami
University of Bridgeport
Dallas Baptist University
University of California Berkeley
University of Texas at Austin
San Francisco State University
Duke University Graduate School
Oklahoma State University
Wichita University
University of Missouri-Columbia Graduate School
University of Michigan
University of Minnesota
University of Missouri-Columbia Graduate School
University of Nebraska
University of New Mexico
University of North Alabama
University of North Carolina
University of North Dakota
University of Oklahoma
University of Oregon