| State: | ME |
| Type: | ME |
| Route: | 204 |
| Map Custom: | yes |
| Length Mi: | 6.47 |
| Length Ref: | [1] |
| Established: | 1936 (current routing) |
| Direction A: | West |
| Terminus A: | in Trenton |
| Junction: | in Lamoine |
| Direction B: | East |
| Terminus B: | Seal Point Road / Marlboro Beach Road in Lamoine |
| Counties: | Hancock |
| Previous Type: | US |
| Previous Route: | 202 |
| Next Type: | ME |
| Next Route: | 205 |
State Route 204 (SR 204) is part of Maine's system of numbered state highways, located in Hancock County. It runs from SR 3 in Trenton, passing SR 184 in Lamoine, and ending at the intersection with Seal Point and Marlboro Beach roads. The route is 6.5miles long.
SR 204 begins at SR 3 in Trenton. It heads northeast, crossing into Lamoine. Then the route has a 300adj=midNaNadj=mid concurrency with SR 184 in Lamoine. After the concurrency, SR 204 is heading southeast towards Seal Point Road and Marlboro Beach Road, where the SR 204 designation ends.