Washington 221
| Termini | WA-22 in Prosser to WA-14 in Paterson |
| Length | 26.1 miles |
| "Where does it go?" | Connects the Prosser/Grandview area to the Columbia River and Oregon border. |

| SB Miles | Southbound down | Northbound up | NB Miles | Google™ | Multiplex | Near City or Town |
County |
| 0.0 |
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26.1 |
|
Prosser | Benton | ||
| 12.6 | County Well Rd | 13.5 |
|
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| 26.1 |
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0.0 |
|
Paterson | |||
Highways of
Washington State - State Route 221
Washington
State Legislation - Route 221