How Plattsmouth, Nebraska Got Its Name (Right Where It Says)

Name origin: Documented5 sourcesChecked Oct 27, 2026
Detail of a 1956 U.S. Geological Survey map showing the streets of Plattsmouth on the hills above the Missouri River bottomland, with the levee to the east
Plattsmouth on the U.S. Geological Survey's Plattsmouth sheet, 1956. The Platte meets the Missouri just north of town. U.S. Geological Survey, Plattsmouth sheet (1:24,000), 1956. Public domain.

Plattsmouth, Nebraska, is named for exactly where it sits: at the mouth of the Platte River, where it empties into the Missouri. The town was laid out in November 1854.

Where the name comes from

There’s no mystery here. A 1925 study of Nebraska place names says the town “was so named because of its location at the mouth of the Platte river.” The U.S. Geological Survey’s record agrees: it was “named because of its location at the confluence of the Platte and Missouri rivers.”

Before the town

People knew this spot long before anyone platted a town. Lewis and Clark’s journals record the expedition reaching the mouth of the Platte on July 21, 1804. Cass County’s history page says Samuel Martin was crossing the Missouri here by 1852. A 1905 plat book of Cass County dates Martin’s crossing to early spring 1853, when he came to set up a trading post, and that the town company was organized in October 1854.

Laying out the town

The 1925 study says O. N. Tyson, surveyor for the Plattsmouth Town Company, laid out and platted the town in November 1854, and that the territorial legislature incorporated it by an act approved March 14, 1855. Plattsmouth is the county seat of Cass County.

Sources & further reading

  • Lilian Linder Fitzpatrick, Nebraska Place-Names (University of Nebraska, 1925). A public-domain study of the state’s place names, county by county. The mouth of the Platte; Tyson’s plat in November 1854; the act of March 14, 1855.
  • The Journals of the Lewis and Clark Expedition (University of Nebraska–Lincoln), July 21, 1804. Arrival at the mouth of the Platte.
  • Cass County, “About.” Samuel Martin crossing the Missouri in 1852.
  • 1905 Plat Book of Cass County (NEGenWeb). Samuel Martin’s trading post in 1853 and the town company of October 1854.
  • GNIS feature 832160 (U.S. Geological Survey). The federal record for Plattsmouth. Founded 1854; incorporated 1855.

Spot something wrong? Corrections are noted here with their date, never made silently.

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