| City | Club Name | Club # | |
|---|---|---|---|
| Ames | AMES OPTIMIST CLUB | 40200 | |
| ANKENY | ANKENY, IA | 40174 |
|
| BETTENDORF | BETTENDORF, IA | 40193 | |
| BLOOMFIELD | BLOOMFIELD, IA | 40015 | |
| Boone | BOONE, IA | 40197 | |
| BURLINGTON | BURLINGTON-WEST BURLINGTON, IA | 40012 | |
| CEDAR RAPIDS | CEDAR RAPIDS, IA | 40020 |
|
| CEDAR RAPIDS | CEDAR RAPIDS-THURSDAY NOON, IA | 40115 |
|
| CORALVILLE | CORALVILLE, IA | 40030 | |
| CORYDON | WAYNE-CORYDON, IA | 40032 | |
| COUNCIL BLUFFS | COUNCIL BLUFFS, IA | 40035 | |
| COUNCIL BLUFFS | COBRA- COUNCIL BLUFFS, IA | 40176 | |
| Council Bluffs | MANNA CARES OPTIMIST CLUB | 40203 | |
| DAVENPORT | DAVENPORT QUAD CITIES-MORNING, IA | 40038 |
|
| DAVENPORT | DAVENPORT NOON OPTIMIST CLUB | 40040 |
|
| DES MOINES | DES MOINES-WESTERN-NOON, IA | 40048 |
|
| DES MOINES | DES MOINES, IA | 40050 |
|
| DUBUQUE | DUBUQUE, IA | 40055 |
|
| DUBUQUE | DUBUQUE-EVE, IA | 40064 | |
| DUBUQUE | DUBUQUE-MORNING, IA | 40088 | |
| ELDRIDGE | NORTH SCOTT, IA | 40018 | |
| FORT MADISON | FORT MADISON AREA, IA | 40153 | |
| GRINNELL | GRINNELL, IA | 40173 | |
| GRISWOLD | GRISWOLD, IA | 40070 |
|
| IOWA CITY | IOWA CITY, IA | 40075 | |
| IOWA CITY | HAWKEYE OPTIMIST CHAPTER | 40168 |
|
| KALONA | KALONA, IA | 40077 |
|
| KIMBALLTON | KIMBALLTON-ELK HORN, IA | 40061 | |
| KNOXVILLE | KNOXVILLE, IA | 40132 | |
| LAMONI | LAMONI, IA | 40181 | |
| LECLAIRE | RIVER VALLEY, IA | 40021 | |
| LEMARS | LEMARS, IA | 40076 | |
| LOGAN | LOGAN, IA | 40011 | |
| MAQUOKETA | MAQUOKETA, IA | 40085 | |
| MARSHALLTOWN | MARSHALLTOWN, IA | 40090 | |
| Mediapolis | MEDIAPOLIS OPTIMIST CLUB | 40204 | |
| Mt. Pleasant | OPTIMIST CLUB OF HENRY COUNTY, IA | 40199 | |
| Newton | NEWTON OPTIMIST CLUB | 40205 | |
| NORTH LIBERTY | NORTH LIBERTY, IA | 40096 |
|
| OAKLAND | RIVERSIDE, IA | 40017 | |
| OSKALOOSA | OSKALOOSA, IA | 40117 | |
| Peosta | PEOSTA | 40201 | |
| PERRY | PERRY, IA | 40172 | |
| RED OAK | RED OAK, IA | 40095 | |
| SHENANDOAH | SHENANDOAH, IA | 40101 | |
| Sioux City | SIOUXLAND, IA | 40194 | |
| SOLON | SOLON, IA | 40103 |
|
| TREYNOR | TREYNOR, IA | 40109 |
|
| UNDERWOOD | UNDERWOOD, IA | 40113 | |
| URBANDALE | URBANDALE, IA | 40157 |
|
| WALNUT | WALNUT, IA | 40122 | |
| WASHINGTON | WASHINGTON, IA | 40118 | |
| WASHINGTON TOWNSHI | WASHINGTON TOWNSHIP, IA | 40119 | |
| WATERLOO | WATERLOO, IA | 40120 | |
| WINTERSET | WINTERSET, IA | 40128 |