Safety in Big Sioux
Big Sioux doesn’t have its own police figures in the FBI’s data. It’s most likely covered by the Union County Sheriff’s Office. Below is what it reports.
What stands out about safety in Big Sioux
Read from the numbers below. The page puts what stands out first.
Big Sioux is covered by the county
Big Sioux has no police department of its own in the FBI’s data. Calls here most likely go to the Union County Sheriff’s Office, and its numbers cover the whole area it patrols, not just Big Sioux.
Crimes reported in the parts of Union County it patrols: the towns and villages without police of their own.
Property crimes (burglary, theft, stolen cars)
Violent crimes (assault, robbery, rape, murder)
These are counts, not rates. The FBI doesn’t publish how many people each agency covers, so we can’t turn them into a per-resident figure or a Safety Grade. Source: FBI Uniform Crime Reporting, offenses known to law enforcement by county and by state agency.
Big Sioux and its neighbors
How reported crime compares across the town line. Tap a town to see its safety page.
| Town | Grade | Violent | Property | Year |
|---|---|---|---|---|
| North Sioux City | C+ | 1.6 | 18.3 | 2025 |
| Sioux City | D | 4.9 | 28 | 2025 |
Reported crimes per 1,000 residents in each town’s latest year; * = a count, for towns under 1,000 people; — = not graded. No town figures in the FBI’s data: Dakota Dunes, Jefferson.
Know who to call, and what the weather can do
For emergencies, the nearest ER, and the storms and floods Big Sioux plans for.
Sioux City · 5.3 miles
Directions Health care →Expected damage is higher than in 86% of U.S. communities. 27 paid flood insurance claims since 2011.
Natural hazards in Big Sioux →Phone numbers come from neighbors and the town’s own site (the Handbook). A number you add goes live once two neighbors confirm it.
Heads-up board
Neighbors looking out for each other in Big Sioux.
Your answer becomes a post in Town Square.
Please don’t name or describe individuals. In an emergency, call 911.
Crime: FBI Uniform Crime Reporting Program, Crime Data Explorer: offenses known to law enforcement by city, and state and national rates. Counts are crimes reported to police, not convictions. The Safety Grade is our own summary of that data, not an official rating. Natural hazards: FEMA National Risk Index and flood insurance claims. Hospitals: CMS Hospital General Information. This isn’t an official statement of public safety. In an emergency, call 911.