| Steven Van Steenhuyse | American Planning Association Iowa Chapter | Opposing | GA88 |
| MIke Delaney | Citizens For A Healthy Iowa | Opposing | GA88 |
| Gary Grant | City of Cedar Rapids | Opposing | GA88 |
| Gary Grant | City of Cedar Rapids | Withdrawn | GA88 |
| Gary Grant | City of Cedar Rapids | Undecided | GA88 |
| Larry Murphy | City of Cedar Rapids | Opposing | GA88 |
| Larry Murphy | City of Cedar Rapids | Withdrawn | GA88 |
| Larry Murphy | City of Cedar Rapids | Undecided | GA88 |
| Meghan Malloy | City of Cedar Rapids | Opposing | GA88 |
| Meghan Malloy | City of Cedar Rapids | Withdrawn | GA88 |
| Meghan Malloy | City of Cedar Rapids | Undecided | GA88 |
| Dane Schumann | Connect CR | Opposing | GA88 |
| Maddie Wilcox | Connect CR | Opposing | GA88 |
| Threase Harms | Connect CR | Opposing | GA88 |
| Dane Schumann | Des Moines Water Works | Opposing | GA88 |
| Maddie Wilcox | Des Moines Water Works | Opposing | GA88 |
| Threase Harms | Des Moines Water Works | Opposing | GA88 |
| Mark Joyce | E. I. du Pont de Nemours and Company dba Corteva Agriscience | Undecided | GA88 |
| Dane Schumann | Grow Clinton County | Opposing | GA88 |
| Maddie Wilcox | Grow Clinton County | Opposing | GA88 |
| Threase Harms | Grow Clinton County | Opposing | GA88 |
| Teresa Bomhoff | IA Mental Health Planning Council | Opposing | GA88 |
| Dane Schumann | Iowa Alliance of YMCA's | Undecided | GA88 |
| Maddie Wilcox | Iowa Alliance of YMCA's | Undecided | GA88 |
| Threase Harms | Iowa Alliance of YMCA's | Undecided | GA88 |
| Bob Rafferty | Iowa Bicycle Coalition | Opposing | GA88 |
| Dane Schumann | Iowa Bicycle Coalition | Opposing | GA88 |
| Maddie Wilcox | Iowa Bicycle Coalition | Opposing | GA88 |
| Threase Harms | Iowa Bicycle Coalition | Opposing | GA88 |
| Larry Murphy | Iowa Catholic Conference | Undecided | GA88 |
| Meghan Malloy | Iowa Catholic Conference | Undecided | GA88 |
| Kellie Paschke | Iowa Cattlemen's Association | Supporting | GA88 |
| Troy Skinner | Iowa Cattlemen's Association | Supporting | GA88 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Opposing | GA88 |
| Mike Heller | Iowa Conservation Alliance | Opposing | GA88 |
| Paula Feltner | Iowa Conservation Alliance | Opposing | GA88 |
| Adam Schnieders | Iowa Dept. of Natural Resources | Undecided | GA88 |
| Doug Struyk | Iowa Drainage District Association | Undecided | GA88 |
| Jennifer Dorman | Iowa Drainage District Association | Undecided | GA88 |
| Jim Carney | Iowa Drainage District Association | Undecided | GA88 |
| John Torbert | Iowa Drainage District Association | Undecided | GA88 |
| Mona Bond | Iowa Drainage District Association | Undecided | GA88 |
| Alicia Vasto | Iowa Environmental Council | Opposing | GA88 |
| Cindy Lane | Iowa Environmental Council | Opposing | GA88 |
| Dane Schumann | Iowa Environmental Council | Opposing | GA88 |
| Maddie Wilcox | Iowa Environmental Council | Opposing | GA88 |
| Threase Harms | Iowa Environmental Council | Opposing | GA88 |
| Don Petersen | Iowa Farm Bureau Federation | Supporting | GA88 |
| Kevin Kuhle | Iowa Farm Bureau Federation | Supporting | GA88 |
| Matthew Steinfeldt | Iowa Farm Bureau Federation | Supporting | GA88 |
| Carolann Jensen | Iowa Finance Authority | Undecided | GA88 |
| Matthew Russell | Iowa Interfaith Power & Light | Opposing | GA88 |
| Alan Kemp | Iowa League of Cities | Undecided | GA88 |
| Daniel Stalder | Iowa League of Cities | Undecided | GA88 |
| Robert Palmer | Iowa League of Cities | Undecided | GA88 |
| Amy Campbell | Iowa Natural Heritage Foundation | Opposing | GA88 |
| Anna Gray | Iowa Natural Heritage Foundation | Opposing | GA88 |
| Craig Patterson | Iowa Natural Heritage Foundation | Opposing | GA88 |
| Dane Schumann | Iowa Rivers Revival | Opposing | GA88 |
| Maddie Wilcox | Iowa Rivers Revival | Opposing | GA88 |
| Threase Harms | Iowa Rivers Revival | Opposing | GA88 |
| Emily Piper | Iowa Rural Water Association | Undecided | GA88 |
| Jamie Cashman | Iowa State Association of Counties | Opposing | GA88 |
| Kristi Harshbarger | Iowa State Association of Counties | Opposing | GA88 |
| Lucas Beenken | Iowa State Association of Counties | Opposing | GA88 |
| William Peterson | Iowa State Association of Counties | Opposing | GA88 |
| Mike Heller | Iowa State Snowmobile Association | Opposing | GA88 |
| Paula Feltner | Iowa State Snowmobile Association | Opposing | GA88 |
| MIke Delaney | Izaak Walton League - Iowa Division | Opposing | GA88 |
| Tim Wagner | Izaak Walton League of America | Opposing | GA88 |
| Tim Wagner | Izaak Walton League of America | Withdrawn | GA88 |
| Tim Wagner | Izaak Walton League of America | Supporting | GA88 |
| Gary Grant | Linn County Board of Supervisors | Opposing | GA88 |
| Gary Grant | Linn County Board of Supervisors | Withdrawn | GA88 |
| Gary Grant | Linn County Board of Supervisors | Undecided | GA88 |
| Larry Murphy | Linn County Board of Supervisors | Opposing | GA88 |
| Larry Murphy | Linn County Board of Supervisors | Withdrawn | GA88 |
| Larry Murphy | Linn County Board of Supervisors | Undecided | GA88 |
| Meghan Malloy | Linn County Board of Supervisors | Opposing | GA88 |
| Meghan Malloy | Linn County Board of Supervisors | Withdrawn | GA88 |
| Meghan Malloy | Linn County Board of Supervisors | Undecided | GA88 |
| Brian Johnson | Personal Interest-Brian Johnson | Undecided | GA88 |
| MIke Delaney | Raccoon River Watershed Association | Opposing | GA88 |
| Emily Piper | Rathbun Regional Water Association | Undecided | GA88 |
| Sydney Gangestad | The Iowa Academy of Trust and Estate Counsel | Undecided | GA88 |
| Tim Coonan | The Iowa Academy of Trust and Estate Counsel | Undecided | GA88 |
| Amber Markham | The Nature Conservancy | Opposing | GA88 |
| Doug Struyk | The Nature Conservancy | Opposing | GA88 |
| Jennifer Dorman | The Nature Conservancy | Opposing | GA88 |
| Jim Carney | The Nature Conservancy | Opposing | GA88 |
| Gary Grant | Urban County Coalition | Opposing | GA88 |
| Gary Grant | Urban County Coalition | Withdrawn | GA88 |
| Gary Grant | Urban County Coalition | Undecided | GA88 |
| Larry Murphy | Urban County Coalition | Opposing | GA88 |
| Larry Murphy | Urban County Coalition | Withdrawn | GA88 |
| Larry Murphy | Urban County Coalition | Undecided | GA88 |
| Meghan Malloy | Urban County Coalition | Opposing | GA88 |
| Meghan Malloy | Urban County Coalition | Withdrawn | GA88 |
| Meghan Malloy | Urban County Coalition | Undecided | GA88 |