NY 304 starts at the New Jersey state line and proceeds north to US 9W. A portion of the route is a short freeway bypassing the original alignment; this was planned as part of a longer freeway north to Haverstraw at Hook Mountain State Park, but the remainder of the freeway was cancelled due to low projected traffic counts; the bypass was extended, however, as a divided highway.
| Mile | Northbound | Southbound | Notes |
|---|---|---|---|
| Rockland County | |||
| Speed Limit 55 | |||
| 0.7 |  |
 Hillside Avenue Freeway Ends |
|
| 1.6 | Crooked Hill Road | ||
| 1.9 | Middletown Road Nanuet |
Middletown Road South Pearl River |
 |
| 1.9 | Middletown Road North Nanuet |
|
|
| 3.5 |  EastNyack |
||
| 3.5 | West Spring Valley |
||
| 3.8 | West Nyack Road Freeway Ends |
|
|
| Speed Limit 55 | |||
| Rockland County | |||