10 Worst Counties for Accidents in Wisconsin

When it comes to traffic safety, not all areas of Wisconsin are created equal. While rural roads pose their own risks, the state’s most populated counties consistently rank as the most dangerous for auto accidents. Based on data from the Wisconsin Department of Transportation, here’s a closer look at the top 10 counties where crashes happen most frequently—and why.

1. Milwaukee County

Milwaukee County leads the state by a wide margin, with nearly 30,000 crashes reported in a single year. High population density, heavy traffic, and complex urban intersections all contribute to its top ranking.

2. Dane County

Home to Madison, Dane County consistently ranks second. With nearly 12,000 crashes annually, a mix of city driving, university traffic, and rapid growth increases accident risk. 

3. Waukesha County

Waukesha County, part of the Milwaukee metro area, sees heavy commuter traffic. Its proximity to major highways makes it a hotspot for both congestion and collisions.

4. Racine County

Racine County benefits from lakefront views—but also busy corridors between Milwaukee and Chicago. This constant flow of regional traffic contributes to over 5,000 crashes yearly. 

5. Outagamie County

Centered around Appleton, Outagamie County experiences a high volume of daily commuters and commercial vehicles, pushing accident totals into the top five statewide. 

6. Kenosha County

Bordering Illinois, Kenosha County is a major travel corridor. Interstate traffic and cross-state commuting significantly increase crash frequency. 

7. Brown County

Home to Green Bay, Brown County combines urban streets with event-driven traffic (think game days), which can spike accident numbers throughout the year. 

8. Rock County

Rock County sits along key transportation routes near the Illinois border. Its mix of rural highways and city driving creates diverse—and sometimes dangerous—conditions. 

9. Winnebago County

Winnebago County, including Oshkosh, sees steady traffic from tourism, events, and regional travel, contributing to over 4,000 crashes annually. 

10. La Crosse County

Rounding out the list, La Crosse County has fewer total crashes than larger counties but still ranks high relative to its size. It has also experienced spikes in fatal crashes in certain years. 

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