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About Sioux County

Sioux County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 35,872. The county seat is Orange City and the largest city is Sioux Center.

Description adapted from Wikipedia, CC BY-SA 4.0.

Sioux County, Iowa
Sioux county ia courthouse 2 — CC BY-SA 3.0, Josejuan05 · source

History of Sioux County

Sioux County was formed on January 15, 1851. It has been self-governed since January 20, 1860. It was named after the Sioux tribe. The first county seat was Calliope in 1860, then a small village with 15 inhabitants, and later part of Hawarden. The first courthouse was built in 1860 and served as such until 1872. A larger immigration wave began in 1869, primarily of Dutch. In 1872, Orange City was declared the seat. In June 1902, the construction began on a new Sioux County courthouse designed by W.W. Beach. Made of red sandstone, it was completed in 1904, and still serves as the courthouse. From 1976 until 1982 the building was completely restored, and in 1977, it was listed on the National Register of Historic Places.

Adapted from Wikipedia, CC BY-SA 4.0.

Sioux County at a glance

County seat
Orange City
Population
35,872 (2020)
Land area
756 sq mi
Founded
1851

Largest communities in Sioux County

  1. Sioux Center 8,229
  2. West Branch Township 7,535
  3. Orange City county seat 6,267
  4. Holland Township 5,803
  5. Sheldon 5,512

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Official channels

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Neighboring counties

Part of Iowa Voter Check

This is the Sioux County page of Iowa Voter Check, a project of True the Vote, pointing Iowa voters at the official tools that already exist — and at Scan Check Protect to verify your registration.

Where anything here differs from what Sioux County or the Iowa Secretary of State publishes, they are right and this page is not.