Data / Rankings / Traffic fatality rate / Counties in Idaho

Counties in Idaho by traffic fatality rate

Boise County had the highest traffic fatality rate of 44 counties in 2015, at 133.7 per 100,000 people. Washington County had the lowest, at 0 per 100,000 people. The median was 18.6 per 100,000 people and the figure for Idaho was 13 per 100,000 people. Source: NHTSA and BEA.

Keep it in a collection in your library.
Highest133.7Boise County
Lowest0Washington County
Median18.644 counties
Idaho13History

Map of counties, 2015

Ada County: 5.3 per 100,000 peopleAdams County: 103.3 per 100,000 peopleBannock County: 10.8 per 100,000 peopleBear Lake County: 0 per 100,000 peopleBenewah County: 22.1 per 100,000 peopleBingham County: 37.4 per 100,000 peopleBlaine County: 0 per 100,000 peopleBoise County: 133.7 per 100,000 peopleBonner County: 35.8 per 100,000 peopleBonneville County: 2.7 per 100,000 peopleBoundary County: 0 per 100,000 peopleButte County: 39.4 per 100,000 peopleCamas County: 96 per 100,000 peopleCanyon County: 12.2 per 100,000 peopleCaribou County: 45 per 100,000 peopleCassia County: 29.5 per 100,000 peopleClark County: 116.4 per 100,000 peopleClearwater County: 35.3 per 100,000 peopleCuster County: 123 per 100,000 peopleElmore County: 37.7 per 100,000 peopleFranklin County: 15.4 per 100,000 peopleFremont County: 15.5 per 100,000 peopleGem County: 11.8 per 100,000 peopleGooding County: 26.3 per 100,000 peopleIdaho County: 24.7 per 100,000 peopleJefferson County: 14.6 per 100,000 peopleJerome County: 30.7 per 100,000 peopleKootenai County: 7.3 per 100,000 peopleLatah County: 2.6 per 100,000 peopleLemhi County: 26 per 100,000 peopleLewis County: 27.5 per 100,000 peopleLincoln County: 76.9 per 100,000 peopleMadison County: 6.7 per 100,000 peopleMinidoka County: 19.3 per 100,000 peopleNez Perce County: 9.8 per 100,000 peopleOneida County: 0 per 100,000 peopleOwyhee County: 17.8 per 100,000 peoplePayette County: 17.2 per 100,000 peoplePower County: 38.4 per 100,000 peopleShoshone County: 23.8 per 100,000 peopleTeton County: 0 per 100,000 peopleTwin Falls County: 13.2 per 100,000 peopleValley County: 0 per 100,000 peopleWashington County: 0 per 100,000 people
  • Under 3
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  • 12 to 19
  • 19 to 29
  • 29 to 39
  • 39 and over
per 100,000 people, 2015. Source: Invokely calculation with data from NHTSA, BEA. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2015

Boise County: 133.7 per 100,000 peopleBoise County133.7Custer County: 123 per 100,000 peopleCuster County123Clark County: 116.4 per 100,000 peopleClark County116.4Adams County: 103.3 per 100,000 peopleAdams County103.3Camas County: 96 per 100,000 peopleCamas County96Lincoln County: 76.9 per 100,000 peopleLincoln County76.9Caribou County: 45 per 100,000 peopleCaribou County45Butte County: 39.4 per 100,000 peopleButte County39.4Power County: 38.4 per 100,000 peoplePower County38.4Elmore County: 37.7 per 100,000 peopleElmore County37.7Bingham County: 37.4 per 100,000 peopleBingham County37.4Bonner County: 35.8 per 100,000 peopleBonner County35.8Clearwater County: 35.3 per 100,000 peopleClearwater County35.3Jerome County: 30.7 per 100,000 peopleJerome County30.7Cassia County: 29.5 per 100,000 peopleCassia County29.5Lewis County: 27.5 per 100,000 peopleLewis County27.5Gooding County: 26.3 per 100,000 peopleGooding County26.3Lemhi County: 26 per 100,000 peopleLemhi County26Idaho County: 24.7 per 100,000 peopleIdaho County24.7Shoshone County: 23.8 per 100,000 peopleShoshone County23.8Benewah County: 22.1 per 100,000 peopleBenewah County22.1Minidoka County: 19.3 per 100,000 peopleMinidoka County19.3Owyhee County: 17.8 per 100,000 peopleOwyhee County17.8Payette County: 17.2 per 100,000 peoplePayette County17.2Fremont County: 15.5 per 100,000 peopleFremont County15.5Franklin County: 15.4 per 100,000 peopleFranklin County15.4Jefferson County: 14.6 per 100,000 peopleJefferson County14.6Twin Falls County: 13.2 per 100,000 peopleTwin Falls County13.2Canyon County: 12.2 per 100,000 peopleCanyon County12.2Gem County: 11.8 per 100,000 peopleGem County11.8Bannock County: 10.8 per 100,000 peopleBannock County10.8Nez Perce County: 9.8 per 100,000 peopleNez Perce County9.8Kootenai County: 7.3 per 100,000 peopleKootenai County7.3Madison County: 6.7 per 100,000 peopleMadison County6.7Ada County: 5.3 per 100,000 peopleAda County5.3Bonneville County: 2.7 per 100,000 peopleBonneville County2.7Latah County: 2.6 per 100,000 peopleLatah County2.6Bear Lake County: 0 per 100,000 peopleBear Lake County0Blaine County: 0 per 100,000 peopleBlaine County0Boundary County: 0 per 100,000 peopleBoundary County0Oneida County: 0 per 100,000 peopleOneida County0Teton County: 0 per 100,000 peopleTeton County0Valley County: 0 per 100,000 peopleValley County0Washington County: 0 per 100,000 peopleWashington County0Boise County: 133.7 per 100,000 peopleBoise County133.7Custer County: 123 per 100,000 peopleCuster County123Clark County: 116.4 per 100,000 peopleClark County116.4Adams County: 103.3 per 100,000 peopleAdams County103.3Camas County: 96 per 100,000 peopleCamas County96Lincoln County: 76.9 per 100,000 peopleLincoln County76.9Caribou County: 45 per 100,000 peopleCaribou County45Butte County: 39.4 per 100,000 peopleButte County39.4Power County: 38.4 per 100,000 peoplePower County38.4Elmore County: 37.7 per 100,000 peopleElmore County37.7Bingham County: 37.4 per 100,000 peopleBingham County37.4Bonner County: 35.8 per 100,000 peopleBonner County35.8Clearwater County: 35.3 per 100,000 peopleClearwater County35.3Jerome County: 30.7 per 100,000 peopleJerome County30.7Cassia County: 29.5 per 100,000 peopleCassia County29.5Lewis County: 27.5 per 100,000 peopleLewis County27.5Gooding County: 26.3 per 100,000 peopleGooding County26.3Lemhi County: 26 per 100,000 peopleLemhi County26Idaho County: 24.7 per 100,000 peopleIdaho County24.7Shoshone County: 23.8 per 100,000 peopleShoshone County23.8Benewah County: 22.1 per 100,000 peopleBenewah County22.1Minidoka County: 19.3 per 100,000 peopleMinidoka County19.3Owyhee County: 17.8 per 100,000 peopleOwyhee County17.8Payette County: 17.2 per 100,000 peoplePayette County17.2Fremont County: 15.5 per 100,000 peopleFremont County15.5Franklin County: 15.4 per 100,000 peopleFranklin County15.4Jefferson County: 14.6 per 100,000 peopleJefferson County14.6Twin Falls County: 13.2 per 100,000 peopleTwin Falls County13.2Canyon County: 12.2 per 100,000 peopleCanyon County12.2Gem County: 11.8 per 100,000 peopleGem County11.8Bannock County: 10.8 per 100,000 peopleBannock County10.8Nez Perce County: 9.8 per 100,000 peopleNez Perce County9.8Kootenai County: 7.3 per 100,000 peopleKootenai County7.3Madison County: 6.7 per 100,000 peopleMadison County6.7Ada County: 5.3 per 100,000 peopleAda County5.3Bonneville County: 2.7 per 100,000 peopleBonneville County2.7Latah County: 2.6 per 100,000 peopleLatah County2.6Bear Lake County: 0 per 100,000 peopleBear Lake County0Blaine County: 0 per 100,000 peopleBlaine County0Boundary County: 0 per 100,000 peopleBoundary County0Oneida County: 0 per 100,000 peopleOneida County0Teton County: 0 per 100,000 peopleTeton County0Valley County: 0 per 100,000 peopleValley County0Washington County: 0 per 100,000 peopleWashington County0
per 100,000 people. Source: Invokely calculation with data from NHTSA, BEA. Retrieved 2026-10-12.

Full ranking

RankCounties2015
per 100,000 people		Change on 2014
1Boise County133.7+73 pts
2Custer County123+98.8 pts
3Clark County116.4+116.4 pts
4Adams County103.3+103.3 pts
5Camas County96+96 pts
6Lincoln County76.9+38.8 pts
7Caribou County45+45 pts
8Butte County39.4+1.5 pts
9Power County38.4+0.1 pts
10Elmore County37.7+30.3 pts
11Bingham County37.4+15.4 pts
12Bonner County35.8+16.5 pts
13Clearwater County35.3+23.6 pts
14Jerome County30.7+8.8 pts
15Cassia County29.5+8.4 pts
16Lewis County27.5-26.8 pts
17Gooding County26.3-0.2 pts
18Lemhi County26-39 pts
19Idaho County24.7-61.8 pts
20Shoshone County23.8-8.2 pts
21Benewah County22.1-11 pts
22Minidoka County19.3+9.6 pts
23Owyhee County17.8+8.9 pts
24Payette County17.2+12.9 pts
25Fremont County15.5-0 pts
26Franklin County15.4-31 pts
27Jefferson County14.6+7.2 pts
28Twin Falls County13.2-1.5 pts
29Canyon County12.2+2.7 pts
30Gem County11.8+11.8 pts
31Bannock County10.8-1.3 pts
32Nez Perce County9.8-2.5 pts
33Kootenai County7.3+3.2 pts
34Madison County6.7+6.7 pts
35Ada County5.3+1.8 pts
36Bonneville County2.7-6.4 pts
37Latah County2.6-13.2 pts
38Bear Lake County0-16.6 pts
38Blaine County0-9.1 pts
38Boundary County0-28 pts
38Oneida County0-23.8 pts
38Teton County00 pts
38Valley County0-71.2 pts
38Washington County0-10 pts

Other periods

About this ranking

Traffic fatalities (NHTSA FARS) per 100,000 residents in the same year and place.

Deaths are counted where the crash happened and divided by the resident population, so counties with busy highways and few residents can show very high rates. Differs from the WHO road traffic death rate (road_traffic_death_rate).

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

Invokely calculation from NHTSA FARS traffic fatalities divided by BEA mid-year population (SAINC1 and CAINC1), per 100,000 residents. https://invokely.ai/docs/methodology#traffic_fatality_rate_per_100k. Retrieved 2026-10-12.

Citation styles

Invokely calculated this figure from the publishers' data, so Invokely is the author and the publishers of the inputs are named.

APA 7

Invokely. (n.d.). NHTSA FARS traffic fatalities divided by BEA mid-year population (SAINC1 and CAINC1), per 100,000 residents (Counties in Idaho by traffic fatality rate, 2015) [Data set]. Calculated from data by NHTSA and BEA. Retrieved October 12, 2026, from https://invokely.ai/docs/methodology#traffic_fatality_rate_per_100k

MLA 9

NHTSA FARS traffic fatalities divided by BEA mid-year population (SAINC1 and CAINC1), per 100,000 residents, Counties in Idaho by traffic fatality rate, 2015. Calculated from data by NHTSA and BEA. Invokely, https://invokely.ai/docs/methodology#traffic_fatality_rate_per_100k. Accessed 12 Oct. 2026.

Chicago (author-date)

Invokely. n.d. NHTSA FARS traffic fatalities divided by BEA mid-year population (SAINC1 and CAINC1), per 100,000 residents. Counties in Idaho by traffic fatality rate, 2015. Dataset. Calculated from data by NHTSA and BEA. Accessed October 12, 2026. https://invokely.ai/docs/methodology#traffic_fatality_rate_per_100k.

Harvard

Invokely (no date) NHTSA FARS traffic fatalities divided by BEA mid-year population (SAINC1 and CAINC1), per 100,000 residents, Counties in Idaho by traffic fatality rate, 2015 [Dataset]. Calculated from data by NHTSA and BEA. Available at: https://invokely.ai/docs/methodology#traffic_fatality_rate_per_100k (Accessed: 12 October 2026).

BibTeX
@misc{invokely_counties_in_idaho_by_2015,
  author = {{Invokely}},
  title = {{NHTSA FARS traffic fatalities divided by BEA mid-year population (SAINC1 and CAINC1), per 100,000 residents: Counties in Idaho by traffic fatality rate, 2015}},
  howpublished = {Data set},
  url = {https://invokely.ai/docs/methodology#traffic_fatality_rate_per_100k},
  urldate = {2026-10-12},
  note = {Calculated from data by NHTSA and BEA. Accessed via Invokely, https://invokely.ai/rankings/traffic-fatality-rate/idaho-counties?period=2015. Publisher attribution: Invokely calculation from NHTSA FARS traffic fatalities divided by BEA mid-year population (SAINC1 and CAINC1), per 100,000 residents. https://invokely.ai/docs/methodology\#traffic\_fatality\_rate\_per\_100k. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - Invokely
TI  - NHTSA FARS traffic fatalities divided by BEA mid-year population (SAINC1 and CAINC1), per 100,000 residents: Counties in Idaho by traffic fatality rate, 2015
PB  - Invokely
DB  - Invokely
UR  - https://invokely.ai/docs/methodology#traffic_fatality_rate_per_100k
L2  - https://invokely.ai/rankings/traffic-fatality-rate/idaho-counties?period=2015
Y2  - 2026/10/12
N1  - Calculated from data by NHTSA and BEA.
N1  - Accessed via Invokely, https://invokely.ai/rankings/traffic-fatality-rate/idaho-counties?period=2015.
N1  - Publisher attribution: Invokely calculation from NHTSA FARS traffic fatalities divided by BEA mid-year population (SAINC1 and CAINC1), per 100,000 residents. https://invokely.ai/docs/methodology#traffic_fatality_rate_per_100k. Retrieved 2026-10-12.
ER  -
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Rank Counties in Idaho by traffic fatality rate using official data, and cite the source.
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Questions

Which county has the highest traffic fatality rate?

Boise County, with 133.7 per 100,000 people in 2015, according to NHTSA and BEA.

Which county has the lowest traffic fatality rate?

Washington County, with 0 per 100,000 people in 2015.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: Invokely, NHTSA FARS traffic fatalities divided by BEA mid-year population (SAINC1 and CAINC1), per 100,000 residents. Retrieved 2026-10-12.

Traffic fatality rate: other rankings

Counties in Idaho: more rankings