Sioux City Police Department
- Features news and events, area crime stats, FAQs, missing and wanted section and kids page.
- http://www.sioux-city.org/dept/index.asp?deptnum=24

Sioux City , Iowa - US Census Bureau
- Provides population, demographic, and housing information.
- http://quickfacts.census.gov/qfd/states/19/1973335.html

City-Data.com: Sioux City, Iowa
- Profiles housing, population demographics, jobs, weather and climate tables. Contains a list of area hospitals, schools, airports, radio and TV broadcast stations, photographs and maps.
- http://www.city-data.com/city/Sioux-City-Iowa.html

Castle on the Hill
- Sioux City Central High. National Register of Historic Places, alumni directory, class reunions, CHS Home Room.
- http://www.globalindex.com/CastleWeb/

City of Sioux City, Iowa
- Features history and description of the city, directory of services, employment opportunities, attractions, events, FAQs and contact details.
- http://www.sioux-city.org/