Markham is a small village in the South Wales Valleys in Caerphilly County Borough, to the northeast of Bargoed. The B4511 road links to Markham from Aberbargoed and joins the A4048 road to the north of Argoed. The Sirhowy River flows to the east of the village.[1][2] The village's population was around 1,495 people in 2011.[3]