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| Bóthar R439 | |
 Green Street, Birr, on the R439 | |
| Route information | |
| Length | 13 km (8.1 mi) |
| Location | |
| Country | Ireland |
| Primary destinations | |
| Highway system | |
The R439 road is a regional road in Ireland linking Birr with Banagher in County Offaly. The route is about 13 km (8 mi) in length.
The road begins with a junction on the N52 road at Emmet Square at the centre of Birr Town and continues northwards taking the following routes through the town; Green Street, Rosse Row, Model School Road, Eden Road & Cappaneale. The road continues northwards forming a crossroads junction with the R438 at Taylor's Cross. The road continues into Banagher as Birr Road & Main Street. The route terminates in Main Street at the junction with the R356.