| Jon Murphy | City of Cedar Falls | Undecided | GA89 |
| Tom Cope | City of Cedar Falls | Undecided | GA89 |
| Gary Grant | City of Cedar Rapids | Opposing | GA89 |
| Larry Murphy | City of Cedar Rapids | Opposing | GA89 |
| Meghan Malloy | City of Cedar Rapids | Opposing | GA89 |
| Jon Murphy | City of Coralville | Undecided | GA89 |
| Tom Cope | City of Coralville | Undecided | GA89 |
| Jim Obradovich | Coalition for Iowa Woodlands and Trees | Opposing | GA89 |
| Robert Mulqueen | Coalition for Iowa Woodlands and Trees | Opposing | GA89 |
| Clara Wulfsen | Department of Revenue | Undecided | GA89 |
| Amy Campbell | Iowa Association of County Conservation Boards | Undecided | GA89 |
| Craig Patterson | Iowa Association of County Conservation Boards | Undecided | GA89 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Opposing | GA89 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Undecided | GA89 |
| Tammie Krausman | Iowa Dept. of Natural Resources | Undecided | GA89 |
| Angela Davis | Iowa Environmental Council | Undecided | GA89 |
| Don Petersen | Iowa Farm Bureau Federation | Supporting | GA89 |
| Kevin Kuhle | Iowa Farm Bureau Federation | Supporting | GA89 |
| Matthew Steinfeldt | Iowa Farm Bureau Federation | Supporting | GA89 |
| Hannah McDowell | Iowa Farmers Union | Undecided | GA89 |
| Nick Laning | Iowa Farmers Union | Undecided | GA89 |
| Threase Harms | Iowa Farmers Union | Undecided | GA89 |
| Alan Kemp | Iowa League of Cities | Undecided | GA89 |
| Daniel Stalder | Iowa League of Cities | Undecided | GA89 |
| Robert Palmer | Iowa League of Cities | Undecided | GA89 |
| Amy Campbell | Iowa Natural Heritage Foundation | Undecided | GA89 |
| Anna Gray | Iowa Natural Heritage Foundation | Undecided | GA89 |
| Craig Patterson | Iowa Natural Heritage Foundation | Undecided | GA89 |
| Brad Epperly | Iowa Society of Certified Public Accountants | Undecided | GA89 |
| Dustin Miller | Iowa Society of Certified Public Accountants | Undecided | GA89 |
| Mike Heller | Iowa State Association of Assessors | Undecided | GA89 |
| Paula Feltner | Iowa State Association of Assessors | Undecided | GA89 |
| Jamie Cashman | Iowa State Association of Counties | Undecided | GA89 |
| Kristi Harshbarger | Iowa State Association of Counties | Undecided | GA89 |
| Lucas Beenken | Iowa State Association of Counties | Undecided | GA89 |
| William Peterson | Iowa State Association of Counties | Undecided | GA89 |
| Jamie Cashman | Iowa State Association of County Supervisors | Undecided | GA89 |
| Kristi Harshbarger | Iowa State Association of County Supervisors | Undecided | GA89 |
| Lucas Beenken | Iowa State Association of County Supervisors | Undecided | GA89 |
| William Peterson | Iowa State Association of County Supervisors | Undecided | GA89 |
| David Adelman | Iowa Wood Industry Association | Opposing | GA89 |
| David Adelman | Iowa Wood Industry Association | Undecided | GA89 |
| Frank Chiodo | Iowa Wood Industry Association | Opposing | GA89 |
| Frank Chiodo | Iowa Wood Industry Association | Undecided | GA89 |
| Matt Hinch | Iowa Wood Industry Association | Opposing | GA89 |
| Matt Hinch | Iowa Wood Industry Association | Undecided | GA89 |
| Sara Allen | Iowa Wood Industry Association | Opposing | GA89 |
| Sara Allen | Iowa Wood Industry Association | Undecided | GA89 |
| Scott Newhard | Iowa Wood Industry Association | Opposing | GA89 |
| Gary Grant | Linn County Board of Supervisors | Opposing | GA89 |
| Gary Grant | Linn County Board of Supervisors | Withdrawn | GA89 |
| Gary Grant | Linn County Board of Supervisors | Undecided | GA89 |
| Larry Murphy | Linn County Board of Supervisors | Opposing | GA89 |
| Larry Murphy | Linn County Board of Supervisors | Withdrawn | GA89 |
| Larry Murphy | Linn County Board of Supervisors | Undecided | GA89 |
| Meghan Malloy | Linn County Board of Supervisors | Opposing | GA89 |
| Meghan Malloy | Linn County Board of Supervisors | Withdrawn | GA89 |
| Meghan Malloy | Linn County Board of Supervisors | Undecided | GA89 |
| Doug Struyk | The Nature Conservancy | Undecided | GA89 |
| Jennifer Dorman | The Nature Conservancy | Undecided | GA89 |
| Jim Carney | The Nature Conservancy | Undecided | GA89 |
| Gary Grant | Urban County Coalition | Undecided | GA89 |
| Larry Murphy | Urban County Coalition | Undecided | GA89 |
| Meghan Malloy | Urban County Coalition | Undecided | GA89 |