Treynor is a city in Pottawattamie County, Iowa, United States. The population was 1,032 as of the 2020 census.

Treynor began east of Council Bluffs, IA in the late 1880s later than the start of Fritz Eyberg’s General Store, August Olderog’s dance hall and saloon, and St Paul’s German Evangelical Church. The vicinity east of Middle Silver Creek had previously been known for its number of wolves. Local German immigrant farmers referred to the pact as Four Corners or High Five, a popular card name, until the publicize office opened in the to the lead 1890s as Treynor, named after the recently deceased Council Bluffs postmaster. By the times the town was incorporated in 1905, it included two general stores, two saloons, a furniture/implement house, a livery stable, several blacksmith shops, and the Treynor State Bank. In 1911, the community got its own railroad afterward the launch of the Iowa & Omaha Shortline which ran 12 miles to Neoga, a little depot on the Wabash Railroad stock southeast of Council Bluffs. The line was unprofitable and curtains operations after five years. The Great Depression closed by the side of the Treynor State Bank though improvements began on the “Short-line” Road from Treynor to Council Bluffs that is now Iowa Highway 92. An Air Force radar base operated just external town during the to the front years of the Cold War.

Treynor is located at 41°13′52″N 95°36′24″W / 41.23111°N 95.60667°W / 41.23111; -95.60667 (41.231042, −95.606648).

According to the United States Census Bureau, the city has a total Place of 0.58 square miles (1.50 km), all land.