| David Scott | American Council of Engineering Companies | Opposing | GA90 |
| David Scott | American Council of Engineering Companies | Undecided | GA90 |
| Jon Murphy | American Planning Association Iowa Chapter | Opposing | GA90 |
| Steven Van Steenhuyse | American Planning Association Iowa Chapter | Opposing | GA90 |
| Tom Cope | American Planning Association Iowa Chapter | Opposing | GA90 |
| Dave Mulholland | American Society of Civil Engineers Iowa Section | Opposing | GA90 |
| Drew Klein | Americans For Prosperity | Supporting | GA90 |
| Tyler Raygor | Americans For Prosperity | Supporting | GA90 |
| Scott Newhard | Associated General Contractors of Iowa | Supporting | GA90 |
| Gary Grant | Cedar Rapids Metro Economic Alliance | Undecided | GA90 |
| Jon Murphy | City of Cedar Falls | Opposing | GA90 |
| Tom Cope | City of Cedar Falls | Opposing | GA90 |
| Gary Grant | City of Cedar Rapids | Opposing | GA90 |
| Gary Grant | City of Cedar Rapids | Withdrawn | GA90 |
| Gary Grant | City of Cedar Rapids | Undecided | GA90 |
| Larry Murphy | City of Cedar Rapids | Opposing | GA90 |
| Larry Murphy | City of Cedar Rapids | Withdrawn | GA90 |
| Larry Murphy | City of Cedar Rapids | Undecided | GA90 |
| Jon Murphy | City of Coralville | Opposing | GA90 |
| Tom Cope | City of Coralville | Opposing | GA90 |
| Doug Struyk | City of Des Moines | Opposing | GA90 |
| Emilee Harris-Puricelli | City of Des Moines | Opposing | GA90 |
| Jen Schulte | City of Des Moines | Opposing | GA90 |
| Jennifer Dorman | City of Des Moines | Opposing | GA90 |
| Jim Carney | City of Des Moines | Opposing | GA90 |
| Doug Struyk | City of Waukee | Opposing | GA90 |
| Jennifer Dorman | City of Waukee | Opposing | GA90 |
| Jim Carney | City of Waukee | Opposing | GA90 |
| Sydney Gangestad | City of West Des Moines | Opposing | GA90 |
| Sydney Gangestad | City of West Des Moines | Undecided | GA90 |
| Tim Coonan | City of West Des Moines | Opposing | GA90 |
| Tim Coonan | City of West Des Moines | Undecided | GA90 |
| Jefferson Fink | Conservation Districts of Iowa | Opposing | GA90 |
| Jim Obradovich | Conservation Districts of Iowa | Opposing | GA90 |
| Victoria Sinclair | Conservation Districts of Iowa | Opposing | GA90 |
| Drew Kamp | Council Bluffs Chamber of Commerce | Undecided | GA90 |
| Joseph Buffington | County Planning and Zoning Officials of Iowa | Opposing | GA90 |
| Brad Epperly | Developers Council | Supporting | GA90 |
| Casey Nickel | Developers Council | Supporting | GA90 |
| Dustin Miller | Developers Council | Supporting | GA90 |
| John Hirl | Ducks Unlimited, Inc. | Undecided | GA90 |
| Marc Beltrame | Ducks Unlimited, Inc. | Undecided | GA90 |
| Josh Mandelbaum | Environmental Law and Policy Center | Opposing | GA90 |
| Steve Falck | Environmental Law and Policy Center | Opposing | GA90 |
| Rachel Ong | Greater Des Moines Habitat for Humanity | Undecided | GA90 |
| Kate Walton | Grow Clinton County | Undecided | GA90 |
| Madeleine Bradley | Grow Clinton County | Undecided | GA90 |
| Matt Eide | Grow Clinton County | Undecided | GA90 |
| Eric Goranson | Habitat for Humanity of Iowa | Undecided | GA90 |
| Jake Highfill | Home Builders Association of Iowa | Supporting | GA90 |
| Jay Iverson | Home Builders Association of Iowa | Supporting | GA90 |
| Tony Phillips | Home Builders Association of Iowa | Supporting | GA90 |
| Jefferson Fink | Iowa Association of Building Officials | Opposing | GA90 |
| Jim Obradovich | Iowa Association of Building Officials | Opposing | GA90 |
| Victoria Sinclair | Iowa Association of Building Officials | Opposing | GA90 |
| Brad Hartkopf | Iowa Association of Business and Industry (ABI) | Supporting | GA90 |
| John Davis | Iowa Association of Business and Industry (ABI) | Supporting | GA90 |
| Michael Ralston | Iowa Association of Business and Industry (ABI) | Supporting | GA90 |
| Nicole Crain | Iowa Association of Business and Industry (ABI) | Supporting | GA90 |
| Greta Haas | Iowa Association of Realtors | Supporting | GA90 |
| Jennifer Kingland | Iowa Association of Realtors | Supporting | GA90 |
| Julie Smith | Iowa Association of Water Agencies | Opposing | GA90 |
| Mike Rozenboom | Iowa Bankers Association | Supporting | GA90 |
| Sharon Presnall | Iowa Bankers Association | Supporting | GA90 |
| Brad Epperly | Iowa Chamber Alliance | Undecided | GA90 |
| Dustin Miller | Iowa Chamber Alliance | Undecided | GA90 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Opposing | GA90 |
| Angela Caulk | Iowa Chapter, American Institute of Architects | Opposing | GA90 |
| Angela Caulk | Iowa Chapter, American Institute of Architects | Undecided | GA90 |
| Brad Epperly | Iowa Chapter, American Institute of Architects | Withdrawn | GA90 |
| Brad Epperly | Iowa Chapter, American Institute of Architects | Opposing | GA90 |
| Christian Frankl | Iowa Chapter, American Institute of Architects | Opposing | GA90 |
| Christian Frankl | Iowa Chapter, American Institute of Architects | Undecided | GA90 |
| Dustin Miller | Iowa Chapter, American Institute of Architects | Withdrawn | GA90 |
| Dustin Miller | Iowa Chapter, American Institute of Architects | Opposing | GA90 |
| Logan Murray | Iowa Chapter, American Institute of Architects | Opposing | GA90 |
| Logan Murray | Iowa Chapter, American Institute of Architects | Undecided | GA90 |
| Noah Tabor | Iowa Chapter, American Institute of Architects | Opposing | GA90 |
| Noah Tabor | Iowa Chapter, American Institute of Architects | Undecided | GA90 |
| Jon Murphy | Iowa Chapter, American Society of Landscape Architects | Opposing | GA90 |
| Tom Cope | Iowa Chapter, American Society of Landscape Architects | Opposing | GA90 |
| Kelly Meyers | Iowa County Attorneys Association | Undecided | GA90 |
| Tom Ferguson | Iowa County Attorneys Association | Undecided | GA90 |
| Haley Hook | Iowa Department of Agriculture & Land Stewardship | Undecided | GA90 |
| Todd Coffelt | Iowa Dept. of Natural Resources | Undecided | GA90 |
| Nick Laning | Iowa Emergency Management Association | Opposing | GA90 |
| Threase Harms | Iowa Emergency Management Association | Opposing | GA90 |
| David Scott | Iowa Engineering Society | Opposing | GA90 |
| David Scott | Iowa Engineering Society | Undecided | GA90 |
| Chelsea Hoye | Iowa Environmental Council | Opposing | GA90 |
| Threase Harms | Iowa Environmental Council | Opposing | GA90 |
| Nichole Hansen | Iowa Finance Authority | Undecided | GA90 |
| Irene DeMaris | Iowa Interfaith Power & Light | Opposing | GA90 |
| Alan Kemp | Iowa League of Cities | Opposing | GA90 |
| Daniel Stalder | Iowa League of Cities | Opposing | GA90 |
| Robert Palmer | Iowa League of Cities | Opposing | GA90 |
| Andy Conlin | Iowa Manufactured Housing Association | Supporting | GA90 |
| David Adelman | Iowa Real Estate Developers Association | Undecided | GA90 |
| Frank Chiodo | Iowa Real Estate Developers Association | Undecided | GA90 |
| Lillie Brady | Iowa Real Estate Developers Association | Undecided | GA90 |
| Matt Hinch | Iowa Real Estate Developers Association | Supporting | GA90 |
| Matt Hinch | Iowa Real Estate Developers Association | Undecided | GA90 |
| Sara Allen | Iowa Real Estate Developers Association | Undecided | GA90 |
| Chelsea Hoye | Iowa Rivers Revival | Opposing | GA90 |
| Nick Laning | Iowa Rivers Revival | Opposing | GA90 |
| Threase Harms | Iowa Rivers Revival | Opposing | GA90 |
| Kate Walton | Iowa Section American Water Works Association | Opposing | GA90 |
| Kate Walton | Iowa Section American Water Works Association | Undecided | GA90 |
| Madeleine Bradley | Iowa Section American Water Works Association | Opposing | GA90 |
| Madeleine Bradley | Iowa Section American Water Works Association | Undecided | GA90 |
| Matt Eide | Iowa Section American Water Works Association | Opposing | GA90 |
| Matt Eide | Iowa Section American Water Works Association | Undecided | GA90 |
| Jamie Cashman | Iowa State Association of Counties | Opposing | GA90 |
| Kristi Harshbarger | Iowa State Association of Counties | Opposing | GA90 |
| Lucas Beenken | Iowa State Association of Counties | Opposing | GA90 |
| William Peterson | Iowa State Association of Counties | Opposing | GA90 |
| Jamie Cashman | Iowa State Association of County Supervisors | Opposing | GA90 |
| Kristi Harshbarger | Iowa State Association of County Supervisors | Opposing | GA90 |
| Lucas Beenken | Iowa State Association of County Supervisors | Opposing | GA90 |
| William Peterson | Iowa State Association of County Supervisors | Opposing | GA90 |
| Doug Struyk | Iowa State Bar Association | Undecided | GA90 |
| Jennifer Dorman | Iowa State Bar Association | Undecided | GA90 |
| Jim Carney | Iowa State Bar Association | Undecided | GA90 |
| Patricia Sauer | Iowa Stormwater Education Partnership | Opposing | GA90 |
| Dane Schumann | Izaak Walton League - Iowa Division | Opposing | GA90 |
| Dane Schumann | Izaak Walton League - Iowa Division | Undecided | GA90 |
| Gary Grant | Linn County Board of Supervisors | Opposing | GA90 |
| Gary Grant | Linn County Board of Supervisors | Withdrawn | GA90 |
| Gary Grant | Linn County Board of Supervisors | Undecided | GA90 |
| Larry Murphy | Linn County Board of Supervisors | Opposing | GA90 |
| Larry Murphy | Linn County Board of Supervisors | Withdrawn | GA90 |
| Larry Murphy | Linn County Board of Supervisors | Undecided | GA90 |
| Kellie Paschke | Marion County Board of Supervisors | Opposing | GA90 |
| Kellie Paschke | Marion County Board of Supervisors | Undecided | GA90 |
| Kelly Meyers | Marion County Board of Supervisors | Opposing | GA90 |
| Kelly Meyers | Marion County Board of Supervisors | Undecided | GA90 |
| Troy Skinner | Marion County Board of Supervisors | Opposing | GA90 |
| Troy Skinner | Marion County Board of Supervisors | Undecided | GA90 |
| John Hall | Marshalltown Area Chamber of Commerce | Undecided | GA90 |
| Ben Hammes | Master Builders of Iowa | Supporting | GA90 |
| David Adelman | Metropolitan Coalition | Undecided | GA90 |
| Frank Chiodo | Metropolitan Coalition | Undecided | GA90 |
| Lillie Brady | Metropolitan Coalition | Undecided | GA90 |
| Matt Hinch | Metropolitan Coalition | Undecided | GA90 |
| Sara Allen | Metropolitan Coalition | Undecided | GA90 |
| Sydney Gangestad | Polk County - Board of Supervisors | Undecided | GA90 |
| Tim Coonan | Polk County - Board of Supervisors | Undecided | GA90 |
| Amy Campbell | Professional Developers of Iowa (PDI) | Undecided | GA90 |
| Craig Patterson | Professional Developers of Iowa (PDI) | Undecided | GA90 |
| Gary Grant | Urban County Coalition | Opposing | GA90 |
| Gary Grant | Urban County Coalition | Withdrawn | GA90 |
| Gary Grant | Urban County Coalition | Undecided | GA90 |
| Larry Murphy | Urban County Coalition | Opposing | GA90 |
| Larry Murphy | Urban County Coalition | Withdrawn | GA90 |
| Larry Murphy | Urban County Coalition | Undecided | GA90 |