How many traffic fatalities occurred in Ada County, Idaho?

Ada County recorded 207 total traffic fatalities across 189 reported crashes over the data period (2016-2023). The most recent year saw 31 fatalities. The county averages approximately 23.0 fatalities per year.

What is the leading cause of road fatalities in Ada County?

Despite a comparatively active crash history (189 recorded crashes), individual cause-code breakdowns are not published for Ada County in the current FARS release. Statewide data for Idaho may provide additional context.

Is the trend of road fatalities in Ada County increasing or decreasing?

The trend in Ada County is increasing. This indicates that traffic fatalities have risen over the data period, warranting attention to road safety initiatives.

How does Ada County compare to the rest of Idaho?

Ada County's per-capita rate of 5.9 per 100,000 residents is below the Idaho county average of 21.2. Visit the Idaho state page for the full county-by-county breakdown.

Where does the road fatality data for Ada County come from?

All road fatality data comes from the NHTSA Fatality Analysis Reporting System (FARS), a census of fatal motor vehicle crashes on public roads in the United States. FARS data covers the period 2016-2023 and includes all crashes resulting in at least one fatality within 30 days.

COUNTY FATALITY DATA

Ada County, Idaho

Q: What is the fatality rate per capita in Ada County?

Ada County has a fatality rate of 5.9 per 100,000 residents, which puts it among the safest one in ten U.S. counties by that per-capita measure among the 3,137 U.S. counties in this dataset.

Road fatality data for Ada County (ID). Data period: 2016-2023.

Compiled by PlainRoadSafety · August 9, 2026

207
Total Fatalities (2016-2023): 31
Latest Year Deaths: 5.9
Per 100k Residents: Increasing
Trend

The verdict

According to the National Highway Traffic Safety Administration Fatality Analysis Reporting System, Ada County ranks #2,144 of 2,328 U.S. counties by road-fatality rate per 100,000 residents (highest first) and #28 of 30 rated counties in ID. Ada County's fatality rate of 5.9 per 100,000 residents puts it among the safest one in ten U.S. counties by that per-capita measure.

#2,144 of 2,328
national by fatality rate: #28 of 30
in ID by rate: 92%
of rated U.S. counties are deadlier per capita: Increasing
fatality trend

NHTSA FARS milepost

Milepost ADA-1 · Ada 5.9/100k · #2,144 of 2,328

Ada County · 5.9/100k · increasing · cause n/a

BAND 5.9/100k
VOL #2,144 of 2,328
AVG 207 book
YOY Increasing
RATE near Anoka
RANK -72.2% vs ID

Stamps derive from this county's NHTSA FARS row (per-100k or book, corpus rank, trend, nationwide peer NAME, vs-state gap), not a trip-risk forecast. PlainRoadSafety is informational only. See our disclaimer. Verify with NHTSA FARS → · Read with methodology → · Understanding road fatality data → · Idaho state profile →

Ada

6
Anoka

6
Forsyth

6
Honolulu

6
Chester

6

What this shows Ada County sits among nearest nationwide per-capita peers.

How does Ada County compare?

2023 road deaths per 100,000 residents. Choose any comparison from the menu.

Compare with

Ada County

5.9 per 100k

Idaho county average

21.2 per 100k

Ada County is 72% safer than the comparison

2023 road deaths from the NHTSA Fatality Analysis Reporting System over population from the U.S. Census Bureau Population Estimates Program (Vintage 2023). Rates shown for counties with 10,000+ residents and a 2023 FARS record.

Among the 15 rated counties in Idaho, Ada County ranks 15 for per-capita risk, below the state's own per-capita average of 21.2 per 100,000 -- nationally, this rate puts it among the safest one in ten U.S. counties by that per-capita measure. The gap between Ada County's rate and the state average is 15.3 per 100,000. Its closest per-capita peer statewide is Blaine County, at 20.0 per 100,000 (a difference of 14.1). Its peer counties, highest to lowest per 100,000 residents: Jerome County (70.6), Idaho County (44.7), Teton County (39.8), Elmore County (37.0), Payette County (33.0), Cassia County (31.1), Benewah County (28.9), Fremont County (28.2), Washington County (26.3), Gooding County (24.9), Valley County (23.7), Jefferson County (23.4), Minidoka County (22.2), Blaine County (20.0).

Ada County's rate vs. every rated U.S. county

Deaths per 100,000 residents -- counties with 10,000+ people, NHTSA FARS over Census population

6 Among the safer counties a lower per-capita rate than 92% of 2,328 rated counties

rated U.S. counties, bucketed by value

Each bar is a band; taller bars hold more rated counties. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source NHTSA FARS over U.S. Census Bureau population estimates · 2026-08-09

Ada County's rate vs. the Idaho state average

← Back to Idaho All States

Source: NHTSA Fatality Analysis Reporting System (FARS) This information is for research and informational purposes only

Read our methodology - how this data is sourced, computed, and verified.

Counties with similar FARS profiles

Two cross-state peer sets for Ada County. Same-state rate comparisons stay in the chart above; these neighborhoods are nearest other-state counties with population at least 250,000.

Similar per-capita fatality rate

Nearest counties by deaths per 100,000 residents (5.9 here), outside Idaho.

Anoka County 5.9 /100k · MN Forsyth County 5.9 /100k · GA Honolulu County 5.9 /100k · HI Chester County 6.0 /100k · PA

Similar fatality volume

Nearest counties by recorded FARS deaths (207 here), excluding the rate-peer set.

Hillsborough County 206 deaths · NH Suffolk County 208 deaths · MA Benton County 209 deaths · AR Lorain County 210 deaths · OH

Verify with NHTSA FARS →

Verify with FHWA →

Source and method. PlainRoadSafety is rendered directly from the National Highway Traffic Safety Administration Fatality Analysis Reporting System (FARS). PlainRoadSafety aggregates published FARS records and does not invent a fatality count the census does not report. County figures are computed directly from NHTSA FARS census data, no figure is typed in by an editor. See our Editorial & Corrections Policy, the methodology behind these numbers, or Report a correction. Data current as of October 2024.