| Name | Address | City | Zip | Drive Through Drop Box? | Open Days Before Election |
| Prosser Courthouse | 620 Market St. | Prosser | 99350 | No | 20 |
| Benton City City Hall | 1009 Dale Ave. | Benton City | 99320 | No | 20 |
| Kennewick City Hall | 524 S. Auburn St. | Kennewick | 99336 | Yes | 20 |
| Finley Middle School | 37208 S. Finley Rd. | Kennewick | 99337 | Yes | 20 |
| Benton County Campus | 7122 W. Okanogan Pl. | Kennewick | 99336 | Yes | 20 |
| Benton County Elections Center | 7122 W. Okanogan Pl. Bldg. F | Kennewick | 99336 | No | 20 |
| Badger Mountain Community Park | Keene Rd. | Richland | 99352 | Yes | 20 |
| Jefferson Park Drop Box | Symons St. | Richland | 99352 | Yes | 20 |
| West Richland Library Drop Box | 3803 W. Van Giesen St. | West Richland | 99353 | Yes | 20 |
| West Richland City Hall Drop Box | 3100 Belmont Blvd. | West Richland | 99353 | Yes | 20 |
| WSU-Tri Cities Drop Box | 2770 Crimson Way | Richland | 99354 | Yes | 20 |
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