County research and study

Idaho county reference

44 counties and county equivalents in Idaho. Search names or FIPS codes, compare Census geography and keep the original sources with your work.

• Ada County

  Idaho · FIPS 16001

  546,141 residents · 2025 estimate

• Adams County

  Idaho · FIPS 16003

  5,013 residents · 2025 estimate

• Bannock County

  Idaho · FIPS 16005

  91,591 residents · 2025 estimate

• Bear Lake County

  Idaho · FIPS 16007

  6,727 residents · 2025 estimate

• Benewah County

  Idaho · FIPS 16009

  10,508 residents · 2025 estimate

• Bingham County

  Idaho · FIPS 16011

  51,153 residents · 2025 estimate

• Blaine County

  Idaho · FIPS 16013

  25,517 residents · 2025 estimate

• Boise County

  Idaho · FIPS 16015

  8,545 residents · 2025 estimate

• Bonner County

  Idaho · FIPS 16017

  54,420 residents · 2025 estimate

• Bonneville County

  Idaho · FIPS 16019

  135,771 residents · 2025 estimate

• Boundary County

  Idaho · FIPS 16021

  13,997 residents · 2025 estimate

• Butte County

  Idaho · FIPS 16023

  2,783 residents · 2025 estimate

• Camas County

  Idaho · FIPS 16025

  1,316 residents · 2025 estimate

• Canyon County

  Idaho · FIPS 16027

  275,123 residents · 2025 estimate

• Caribou County

  Idaho · FIPS 16029

  7,252 residents · 2025 estimate

• Cassia County

  Idaho · FIPS 16031

  26,397 residents · 2025 estimate

• Clark County

  Idaho · FIPS 16033

  783 residents · 2025 estimate

• Clearwater County

  Idaho · FIPS 16035

  9,118 residents · 2025 estimate

• Custer County

  Idaho · FIPS 16037

  4,636 residents · 2025 estimate

• Elmore County

  Idaho · FIPS 16039

  29,465 residents · 2025 estimate

• Franklin County

  Idaho · FIPS 16041

  15,889 residents · 2025 estimate

• Fremont County

  Idaho · FIPS 16043

  14,208 residents · 2025 estimate

• Gem County

  Idaho · FIPS 16045

  21,773 residents · 2025 estimate

• Gooding County

  Idaho · FIPS 16047

  16,446 residents · 2025 estimate

• Idaho County

  Idaho · FIPS 16049

  17,874 residents · 2025 estimate

• Jefferson County

  Idaho · FIPS 16051

  35,297 residents · 2025 estimate

• Jerome County

  Idaho · FIPS 16053

  26,362 residents · 2025 estimate

• Kootenai County

  Idaho · FIPS 16055

  191,864 residents · 2025 estimate

• Latah County

  Idaho · FIPS 16057

  41,842 residents · 2025 estimate

• Lemhi County

  Idaho · FIPS 16059

  8,474 residents · 2025 estimate

• Lewis County

  Idaho · FIPS 16061

  3,704 residents · 2025 estimate

• Lincoln County

  Idaho · FIPS 16063

  5,603 residents · 2025 estimate

• Madison County

  Idaho · FIPS 16065

  55,172 residents · 2025 estimate

• Minidoka County

  Idaho · FIPS 16067

  22,911 residents · 2025 estimate

• Nez Perce County

  Idaho · FIPS 16069

  42,905 residents · 2025 estimate

• Oneida County

  Idaho · FIPS 16071

  5,085 residents · 2025 estimate

• Owyhee County

  Idaho · FIPS 16073

  12,661 residents · 2025 estimate

• Payette County

  Idaho · FIPS 16075

  27,824 residents · 2025 estimate

• Power County

  Idaho · FIPS 16077

  8,246 residents · 2025 estimate

• Shoshone County

  Idaho · FIPS 16079

  14,130 residents · 2025 estimate

• Teton County

  Idaho · FIPS 16081

  13,254 residents · 2025 estimate

• Twin Falls County

  Idaho · FIPS 16083

  97,539 residents · 2025 estimate

• Valley County

  Idaho · FIPS 16085

  12,831 residents · 2025 estimate

• Washington County

  Idaho · FIPS 16087

  11,583 residents · 2025 estimate

Use the county data

Use a county profile as a source-reading exercise or the geographic context for your own research. Keep the county FIPS identifier with your notes so that similarly named places in different states are not mixed.

The figures describe the county; they are not an evaluation of schools or an estimate of educational outcomes.

Geography: 2025 U.S. Census Gazetteer. Population: Vintage 2025 estimates, July 1, 2025. County equivalents include parishes, boroughs, independent cities and planning regions. Puerto Rico population is not supplied by this population file.