1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km² (0.386 sq mi or 247 acres) and river estuaries.
Houdain is a commune in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France.
A former coalmining, now a light industrial and farming town, situated some 3 miles (4.8 km) south of Béthune at the junction of the D86, D301 and the D341 roads. The small rivers Lawe and Blanche join within the commune.
The church of St. John, dating from the thirteenth century.
Hervé, real name Florimond Ronger, a composer, was born here in 1825.