The song was written by Chris Stein and was the fourth single to be taken from the album, Parallel Lines, in the UK and most other parts of the world. The single had an unusual release in Australia, with some dispute among fans as to whether it reached no. 1 there or failed to chart. This is because of its initial release as the lead single from Parallel Lines, due to its being reminiscent of "In The Flesh", Blondie's first hit in Australia. "Sunday Girl" failed to chart, however, and was later re-released as a double A-Side with "Heart of Glass", on the back of its UK success. As a result, it was eclipsed by the disco track, and is rarely recognised as having charted in its own right.
A French-language version of the track was released in the UK on the "Sunday Girl" 12" single; in France and the Netherlands, it was the B-side of the 7". It also appears on the cassette release of Eat to the Beat. For Blondie's first greatest hits album The Best of Blondie in 1981, producer Mike Chapman created a special mix which incorporated one verse sung in French. The bilingual version appears on the 2002 compilation Greatest Hits.
In 2010 a remake of this song was made by the English performer Florrie. It had slightly different lyrics and was used for a Nina Ricci perfume commercial. The song was covered in 2013 by the band She & Him on the album Volume 3.
In 2013 Blondie themselves re-recorded the song and offered it to be included in the CBGB's film soundtrack. This version was included on their 2014 compilation album Greatest Hits Deluxe Redux. The compilation was part of a 2-disc set called Blondie 4(0) Ever which included their 10th studio album Ghosts of Download and marked the 40th anniversary of the forming of the band.