The Route Nationale 427 is a French road which linked Thonnance-les-Joinville to Liffol-le-Grand.
This road is 40 km long and crossed the departments of Haute-Marne and Vosges and the regions of Champagne-Ardenne and Lorraine.
In 1972, this road had been downgraded to D427.
Route Thonnance-les-Joinville (Haute-Marne) (km 0) Suzannecourt (Haute-Marne) (km 1) Poissons (Haute-Marne) (km 5) Noncourt-sur-le-Rongeant (Haute-Marne) (km 7) Thonnance-les-Moulins (Haute-Marne) (km 11) Germay (Haute-Marne) (km 17) Trampot (Vosges) (km 26) Aillianville (Haute-Marne) (km 30) Liffol-le-Grand (Vosges) (km 40)