The 28th State Senate District encompases part of Kent County and includes:
- Ada Township
- Algoma Township
- Alpine Township
- Bowne Township
- Byron Township
- Caledonia Township
- Cannon Township
- City of Cedar Springs
- Courtland Township
- City of East Grand Rapids
- Gaines Township
- Grand Rapids Township
- Nelson Township
- Oakfield Township
- Plainfield Township
- City of Rockford
- Solon Township
- Spencer Township
- Tyrone Township
- City of Walker
- City of Wyoming