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|  | Madison, James | Biography |
| | Mansfield, Mike | Biography |
| | Martin, Joseph W., Jr. | Biography |
| | McCarthy, Joseph R. | Biography |
| | McCormack, John W. | Biography |
| | Mills, Wilbur D. | Biography |
| | Mitchell, George J. | Biography |
| | Mace, House | Encyclopedia Entry |
| | Mace, House | Encyclopedia Entry |
| | Majority and Minority Leaders | Encyclopedia Entry |
| | Majority Party Control | Encyclopedia Entry |
| | Marbury v. Madison | Encyclopedia Entry |
| | Markup | Encyclopedia Entry |
| | Members of Congress: Characteristics | Encyclopedia Entry |
| | Members of Congress: Characteristics | Encyclopedia Entry |
| | Members of Congress: Service Records | Encyclopedia Entry |
| | Morning Business | Encyclopedia Entry |
| | Morning Hour | Encyclopedia Entry |
| | Morning Hour | Encyclopedia Entry |
| | Motions | Encyclopedia Entry |
| | Motions | Encyclopedia Entry |
| | Must-Pass Bill | Encyclopedia Entry |
| | Map of Capitol Hill | Unknown |
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