Denver is a borough in Lancaster County, Pennsylvania. The population was 3,794 at the 2020 census, down from 3,861 at the 2010 census.

Denver was founded by in 1735, by Hans Bucher, a Swiss immigrant. It was originally known as Bucher’s Thal, or “Bucher Valley”, in citation to the bordering Cocalico Creek. In the mid-18th century, a gristmill was built along the creek ,and by 1772 six dwellings had been built. A blacksmith shop and a sawmill were committed by 1820. Early advantages for the treaty were fruitful soils and the limestone formations that were mined for the produce of mortar, plaster and whitewash. In the 1830s, settler John Bucher became an innovative for using the lime as a fertilizer. Several limestone quarries were in turn effective by the 1850s.

During the Civil War, the Reading and Columbia Railroad built a heritage through town, prompting a name regulate to “Union Station”. With time, residents grew tired being referred to as a train station. After researching make known offices in the country, Adam Brubaker found deserted one named Denver. On November 1, 1881, the town was officially renamed Denver.

By the late 19th century, continued bump had some residents gone incorporating as a borough. The tipping lessening was a major ember at the Denver House, a tavern built astern the train station in 1868. Water from a local capably and the genial Cocalico Creek was insufficient to battle the fire, prompting tobacco merchant Aaron Shirk, physician W.D. Fink and businessman Ephraim Renninger to press for incorporation, so a municipal water system could be created. The trio filed an application for concentration in April 1900, and by that December, Denver Borough had come into being. It originally encompassed 183 acres (74 ha), about a quarter its current size.