| International Union of Bricklayers & Allied Craftworkers | I | DC |
| International Union of Bricklayers and Allied Craftworkers | C | DC |
| International Union of Operating Engineers (Iuoe) | C | DC |
| International Union of Operating Engineers Lo 825 Political Action and Education Committee | Q | NJ |
| International Union of Operating Engineers Local 101 Political Action Committee | Q | MO |
| International Union of Operating Engineers Local 103 Voluntary Political Education Fund | Q | IN |
| International Union of Operating Engineers-Local 137 PAC | Q | NY |
| International Union of Operating Engineers Local 139 | Q | WI |
| International Union of Operating Engineers Local 14-14b Voluntary Political Committee | Q | NY |
| International Union of Operating Engineers Local 150 Political Action Committee | Q | IL |
| International Union of Operating Engineers Local 158 Voluntary Political Action Fund | Q | NY |
| International Union of Operating Engineers Local 15 A B C D Political Action Committee | Q | NY |
| International Union of Operating Engineers/Local 17 Political Action Committee | Q | NY |
| International Union of Operating Engineers Local #302 Voluntary Political Fund | Q | WA |
| International Union of Operating Engineers Local 324 National Political Activities Comm. | Q | MI |
| International Union of Operating Engineers Local 463 PAC | Q | NY |
| International Union of Operating Engineers Local 49 PAC | Q | MN |
| International Union of Operating Engineers Local 4 Social Action Committee-Federal | Q | MA |
| International Union of Operating Engineers Local 57 Political Action Fund | Q | RI |
| International Union of Operating Engineers Local 66 Political Education Committee | Q | PA |
| International Union of Operating Engineers Local 68 Political Action Committee | Q | NJ |
| International Union of Operating Engineers Local 701 Federal PAC | Q | OR |
| International Union of Operating Engineers Local 841 PAC | Q | IN |
| International Union of Operating Engineers Local 965 Pef | Q | IL |
| International Union of Operating Engineers Local 99 Committee for Political Education | Q | MD |
| International Union of Operating Engineers Local No. 12 Voluntary Legislative Fund | Q | CA |
| International Union of Operating Engineers Stationary Engineers Local 39 Federal PAC | Q | CA |
| International Union of Painters & Allied Trades Legislative Educational Committee | I | MD |
| International Union of Painters and Allied Trades | C | MD |
| International Union of Painters and Allied Trades Political Action Together Political Committee | Q | MD |
| International Warehouse Logistics Association PAC | Q | IL |
| International Wood Products Association | Q | VA |
| Internet Culture National Committee | X | OH |
| Internet Freedom Political Action Committee | O | IN |
| Internet; the | O | PA |
| Interns for America PAC | Q | IL |
| Intersect Power, LLC PAC | N | OR |
| Interstate Natural Gas Association of America Political Action Committee | Q | DC |
| in the Arena PAC | Q | AR |
| in the Game PAC | O | NY |
| in This Together PAC | V | KY |
| Int'L Association of Bridge, Structural, Ornamental and Reinforcing Iron Workers (Ipal) | Q | DC |
| Intl Assoc of Heat/Frost Insulators/Asbestos Wkrs Loc No 1 PAC (Iah | Q | MO |
| Intl Cemetery Cremation and Funeral Assn. PAC | Q | VA |
| Int Longshoremens Assoc (Ila) Local 1291 Political Action Committee | N | PA |
| Int'L Union of Bricklayers and Allied Craftworkers | Q | DC |
| Intraarctic Alaska Innovation Constituency | O | AK |
| Intra-Cellular Therapies, INC. Political Action Committee (Intra-Cellular Therapies Pac) | N | NJ |
| Intruste Group | O | DC |
| Intuit INC. 21st Century Leadership Fund | Q | CA |
| Intuitive Surgical INC PAC | Q | CA |
| in Union USA Action | I | DC |
| Invenergy LLC PAC | Q | IL |
| Inventor Rights PAC | N | CA |
| Invesco Holding Company (Us), INC. Political Action Committee | Q | GA |
| Invest America PAC | O | WI |
| Investigate Clarence Thomas PAC | O | IL |
| Investigate Presidential Enemy Richard Grayson for Congress | H | AZ |
| Invest in Americans PAC | O | SC |
| Invest in A Strong and Secure America | Q | CA |
| Invest in Education Coalition INC. Action Fund | O | VA |
| Invest in Nevada | O | WI |
| Investment Adviser Association Political Action Committee (Iaa-Pac) | Q | DC |
| Investment Company Institute Political Action Committee (Ici Pac) | Q | DC |
| Invest to Elect New Mexico | N | NM |
| Ion Media Networks INC Political Action Committee | N | FL |
| Ionq, INC. PAC | N | MD |
| Iowa 123 Victory Fund | H | IA |
| Iowa Aviator PAC | O | WI |
| Iowa Citizens for Community Improvement Action Fund | I | IA |
| Iowa Congressional Majority Fund; the | N | VA |
| Iowa Construction Industry PAC/ Associated General Contractors of Iowa | Q | IA |
| Iowa Corn Growers Association PAC | Q | IA |
| Iowa Democratic Party | Y | IA |
| Iowa Farm Bureau Federation Political Action Committee/Fb PAC | Q | IA |
| Iowa First | O | IA |
| Iowa Four | O | IA |
| Iowa Frontline Fund | H | WI |
| Iowa Frontline Women | N | DC |
| Iowa Grassroots Victory Fund | N | IA |
| Iowa Interests PAC | O | IA |
| Iowa Medical Society Political Action Committee | Q | IA |
| Iowa North Carolina Victory Fund | S | DC |
| Iowans for A Progressive Tomorrow | I | IA |
| Iowans for Kim Schmett | H | IA |
| Iowans for Zach Nunn | H | IA |
| Iowa Patriots United | X | IA |
| Iowa Renewable Fuels Association PAC - Irfa PAC | Q | IA |
| Iowa Republican Party 2014 Victory Fund | N | MA |
| Iowa Right to Life Committee PAC | N | IA |
| Iowa Second Congressional District Democrats | X | IA |
| Iowa State Education Association | C | IA |
| Iowa Third Congressional District Democratic Central Committee | Y | IA |
| Iowa Values | O | IA |
| Iowa Values Action | O | IA |
| Iowa Values PAC | N | WI |
| Iowa Victory Fund | H | GA |
| Iowa Victory Fund 2024 | N | DC |
| Iowa Voter Info | N | IA |
| Iowa Works 2020 | S | IA |
| Ipaa Wildcatters Fund | Q | DC |
| I-PAC | O | GA |
| I-PAC | N | VA |
| Ipac | N | NY |
| I-PAC Jax, INC. | Q | FL |
| Ipc International, INC. PAC (Aka Ipc Pac) | N | DC |
| I.P.H.F.H.A. INC. Political Action Committee INC. | Q | KS |
| Ipiluni for Congress | H | CA |
| Ipsen Biopharmaceuticals, INC. Political Action Committee ("Ipsen Pac") | N | NJ |
| Irana Team PAC | O | TX |
| Iranian American Democrats of California PAC | N | CA |
| Iranian American Political Action Committee - Public Affairs Alliance of Iranian Americans | Q | DC |
| Iranian American Republicans of California | N | CA |
| Iranian Americans for Constitution | N | DC |
| Iranian Americans for Peace | O | DC |
| Iraq and Afghanistan Veterans of America Action Fund, INC. PAC | N | NY |
| Ira Roberts for Congress | H | NC |
| Irene Armendariz-Jackson for Congress | H | TX |
| Irep USA | O | TX |
| Irina Baroness von Behr for US Congress | H | AZ |
| Irina Ioana D'Amato | P | CA |
| Irina Vilarino for Congress | H | FL |
| Irish American Democrats | Q | MD |
| Irl PAC | Q | FL |
| Irobot Corporation PAC | N | MA |
| Iroghama Omere for Tx | H | TX |
| Iron Dome Alliance | O | VA |
| Iron Ladies PAC | H | TX |
| Iron Mountain Incorporated Employees PAC | Q | MA |
| Iron PAC | N | DC |
| Ironstache Fund | O | DC |
| Iron Workers Local 167 Political Action League | N | TN |
| Irrigation Association Political Action Committee (Irrigationpac) | N | VA |
| Isaac for Texas | H | TX |
| Isaac for Vermont | S | VT |
| Isaac Holyk for Senate | S | WA |
| Isaac Reed for Congress | H | OH |
| Isaac Smith for Congress | H | TX |
| Isagenix International, LLC PAC | N | AZ |
| Isaiah Abenchuchan for Congress | H | FL |
| Isaiah Lee Two-O-Three | H | CT |
| Isaiah Martin for Congress | H | TX |
| Isaiahruckerforcongress | H | WV |
| Isak Nti Asare for Congress | H | IN |
| Isakson Leadership Committee | N | GA |
| Isakson Victory Committee | N | VA |
| Isemann for New Jersey | H | VA |
| Isg PAC | N | NC |
| Isidro Martinez | P | FL |
| Israel Cruz for US Senate | S | NY |
| Israel Ortega Cruz for Congress | H | NY |
| Israel Today | O | CO |
| Issa for Congress | H | CA |
| Issaq for Congress | H | CA |
| Issa Victory Fund | N | CA |
| Issue One Action | E | DC |
| Istandonit | O | OH |
| Is This America PAC | O | NC |
| It Ain'T That Hard, America | P | SC |
| Italian American Democratic Leadership Council | Q | DC |
| Itascans for Liberty | O | MN |
| Itc Holdings Corp. PAC (Itc Pac) | Q | MI |
| Itg Holdings U.S.A. INC. Political Action Committee (Aka Itg Pac) | Q | NC |
| Ithaca Local of the Democratic Socialists of America, INC. | I | NY |
| Itkis Campaign | H | NY |
| It Matters Who Leads PAC | N | WI |
| Itsbeautime | P | TN |
| Itscookies | X | IL |
| It Serve Alliance - Cpac | N | TX |
| Itserve Alliance, INC. PAC (Itserve Pac) | N | TX |
| It'S Not Ok | O | MI |
| It Starts Today | N | DC |
| It'S the Kids . . . Stupid | O | OH |
| Its the Rent Stupid | N | CA |
| It'S Time for 46 | O | PA |
| It'S Time to Fix Stupid | N | KS |
| It Takes A Village | H | NY |
| Itta PAC | N | DC |
| Itunes Music Quinci Pryce | P | CA |
| Iuoe Operating Engineers | Q | PA |
| Iupat District Council 82 PAC | N | MN |
| Ivan Melendez MD for Congress | H | TX |
| Ivanovskis for Congress | H | TX |
| Ivan Raiklin for US Senate | S | VA |
| Ivan Torres 2020 | H | CA |
| Ives for Il-06 | H | MD |
| Ivote Action Fund | O | DC |
| Ivy4ga INC | H | GA |
| Ivypac | Q | DC |
| Iwachiw4president LLC | P | NY |
| Ixnay PAC | O | NY |
| Iyer4congress | H | CA |
| Izzo for Congress | H | DE |