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Route 540 begins in Graham Corner, near Eel River Lake, and travels north through rural woodlands in northern York County, passing through the community of Maxwell, and by Belle Lake. The highway continues north, into Carleton County and the community of Kirkland, where the woodlands give way to farmland. The highway's first junction with another numbered highway occurs south of Richmond Corner, with Route 555, then just north of Richmond Corner with Route 95, which provides access to Maine and to Woodstock and the Trans-Canada Highway. Past Route 95, the highway continues through several small communities and rural farmland, before turning east near Oakville. The highway comes to an end in Lindsay at an intersection with Route 550.
Route 540
Route 122 in Graham Corner
Route 555 near Richmond Corner
Route 95 near Richmond Corner
Route 550 near Lindsay
Route 122 to US 1 – Orient, Me, Lakeland Ridges
Route 95 to I-95 / Route 2 (TCH) – Houlton, Me, Woodstock