HP has membership in the following U.S. federal or national associations.
| Association/Organization |
| American League of Lobbyists |
| Blue Dog Research Council |
| Business Forward |
| Center for Democracy and Technology (CDT) |
| Center for Strategic and International Studies |
| CIPL |
| Clinton Global Initiative |
| Coalition Against Domain Name Abuse (CADNA) |
| Coalition of Services Industries |
| Compete America |
| Congressional Black Caucus |
| Council on State Taxation |
| Digital Dialogue Forum |
| Idaho Business Association |
| Information Technology and Innovation Foundation |
| Information Technology Industry Council (ITIC) |
| International Conservation Caucus Foundation |
| International Tax Policy Forum |
| Internet Education Foundation |
| ITI Digital Energy Solutions Campaign (DESC) |
| Keystone Center Public Policy |
| National Foreign Trade Council |
| Potomac Exchange |
| Professional Services Council |
| Ripon |
| Tax Council |
| Tax Foundation |
| TechAmerica |
|
TechNet |
| Territorial Tax Coalition |
| Thought Leadership |
| US Capitol Historical Association |
| US Chamber |
| US China Business Council |
| Washington Counsel |
| Washington International Trade Association |
| Washington Tax Group |
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