| Columbia College |
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| Columbia College Chicago |
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| Columbia University |
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| Columbia University Libraries |
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| Columbus Indiana Architectural Archives, Bartholomew County Public Library (BCPL) |
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| Community College of Allegheny County |
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| Community College of Baltimore County |
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| Community College of Philadelphia |
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| Comperio srl |
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| Computer History Museum |
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| Concordia College |
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| Concordia University Library |
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| Congressional Research Service |
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| Connecticut College |
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| Connecticut State Colleges & Universities Library Consortium |
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| Connecticut State Library |
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| Consortium of Academic and Research Libraries in Illinois (CARLI) |
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| Content of Bank Supervisors |
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| Contra Costa Community College District |
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| Contra Costa County Library |
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| Cooper Medical School of Rowan University |
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| Coos County Library Service District |
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| Copyright Clearance Center |
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| Corbis |
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| Cornell College |
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