| Official Name: | Portage Des Sioux, Missouri |
| Settlement Type: | City |
| Mapsize: | 250x200px |
| Image Map1: | Portage-des-sioux.gif |
| Mapsize1: | 250px |
| Map Caption1: | U.S. Census map |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Missouri |
| Subdivision Type2: | County |
| Subdivision Name2: | St. Charles |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 1.75 |
| Area Land Km2: | 1.49 |
| Area Water Km2: | 0.26 |
| Area Total Sq Mi: | 0.67 |
| Area Land Sq Mi: | 0.57 |
| Area Water Sq Mi: | 0.10 |
| Population As Of: | 2020 |
| Population Total: | 335 |
| Population Density Km2: | 224.85 |
| Population Density Sq Mi: | 582.61 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation M: | 132 |
| Elevation Ft: | 433 |
| Coordinates: | 38.9264°N -90.3431°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 63373[2] |
| Area Code: | 636 |
| Blank Name: | FIPS code |
| Blank Info: | 29-59150[3] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0756547 |
Portage Des Sioux is a city in St. Charles County, Missouri, United States. The town sits on the Mississippi River roughly opposite Elsah, Illinois, and is the home of the riverside shrine of Our Lady of the Rivers. The population was 328 at the 2010 census. The city was founded in 1799 by Spanish Lt. Gov. Zenon Trudeau and François Saucier in reaction to American plans to build a military post about 12miles downstream. The French name derives from the overland escape route between the Missouri River and Mississippi River used by a band of Sioux, fleeing enemies; they used this area as a portage for their canoes,[4] outdistancing their rivals who instead paddled all of the way to the confluence of the rivers.
The Treaties of Portage des Sioux in 1815 were signed here ostensibly settling Native American and United States conflicts in the War of 1812. The treaties consolidated and affirmed the Treaty of St. Louis (1804) in which the Sac and Fox ceding northeast Missouri and much of Illinois and Wisconsin and the 1808 Treaty of Fort Clark in which the Osage Nation ceded all of Missouri and Arkansas. These treaties were to ultimately result in the Black Hawk War and the tribes being forced to move west of Missouri.
According to the United States Census Bureau, the city has a total area of 0.53sqmi, of which 0.45sqmi is land and 0.08sqmi is water.[5]
As of 2000 the median income for a household in the city was $38,333, and the median income for a family was $42,321. Males had a median income of $41,875 versus $25,000 for females. The per capita income for the city was $18,693. About 2.8% of families and 2.3% of the population were below the poverty line, including 4.0% of those under age 18 and none of those age 65 or over.
As of the census[6] of 2010, there were 328 people, 136 households, and 90 families residing in the city. The population density was 728.9PD/sqmi. There were 166 housing units at an average density of 368.9/sqmi. The racial makeup of the city was 98.5% White, 0.6% from other races, and 0.9% from two or more races. Hispanic or Latino of any race were 1.8% of the population.
There were 136 households, of which 28.7% had children under the age of 18 living with them, 52.2% were married couples living together, 7.4% had a female householder with no husband present, 6.6% had a male householder with no wife present, and 33.8% were non-families. 31.6% of all households were made up of individuals, and 9.5% had someone living alone who was 65 years of age or older. The average household size was 2.41 and the average family size was 3.02.
The median age in the city was 44.3 years. 22% of residents were under the age of 18; 7.6% were between the ages of 18 and 24; 21.3% were from 25 to 44; 38.8% were from 45 to 64; and 10.4% were 65 years of age or older. The gender makeup of the city was 51.2% male and 48.8% female.
Public education in Portage Des Sioux is administered by the Orchard Farm School District.[7]
Portage Des Sioux had a public library, a branch of the St. Charles City-County District Library. It closed after flooding in 2019.[8]