Offenbach am Main (.mw-parser-output .IPA-label-small{font-size:85%}.mw-parser-output .references .IPA-label-small,.mw-parser-output .infobox .IPA-label-small,.mw-parser-output .navbox .IPA-label-small{font-size:100%}German pronunciation: [ˈɔfn̩bax ʔam ˈmaɪn] ⓘ) is a city in Hesse, Germany, on the left bank of the river Main. It borders Frankfurt and is part of the Frankfurt urban area and the larger Frankfurt Rhein-Main urban area. It has a population of 138,335 (December 2018).[3] In the 20th century, the city's economy was built on machine-building, leather-making, typography and design, and the automobile and pharmaceutical industries.