Potters Bar Urban District

South Mimms Rural District (1894–1934) succeeded by Potters Bar Urban District (1934–1974) was a local government district occupying the area around the village, then urban village or town of Potters Bar, England.

The change from a rural district to an urban district occurred in 1934; with the new district retaining the same boundaries. The urban district was transferred from Middlesex to Hertfordshire in 1965.

More information on the Wikipedia page.