Penllergaer (Welsh: Penlle'r-gaer) is situated about 4.5 miles north west of swansea City Centre, near junction 47 of the M4 Motorway. the population of the community and ward was 2,868 in 2011

Penllergaer is the name of an electoral ward, a community in the City and County of Swansea, Wales, UK. Penllergaer has its own elected community council. The electoral ward consists of Penllergaer, East and West, in the parliamentary constituency of Gower. 

Almost 20% of the population of Penllergaer speak Welsh, significantly more than the Swansea average of 13%. Detailed information about Penllergaer can be found within the City & County of Swansea Ward Profile.