Idaho County Map
All 44 counties with county seats and major cities
Idaho has 44 counties, and the largest of them, Idaho County, covers about 8,500 square miles of land. This map shows all 44 counties and their county seats. Tap a county for details, or download the free printable map below.
Updated October 4, 2026 · Boundaries: U.S. Census Bureau 2025 · Population: Census estimates for July 1, 2025
Idaho county facts
- Number of counties
- 44
- Largest by land area
- Idaho County 8,478 sq mi
- Smallest by land area
- Payette County 406.9 sq mi
- Most people
- Ada County 546,141
- Fewest people
- Clark County 783
- Fastest growing since 2020
- Camas County +22.8%
- Highest median household income
- Teton County $99,805
- Oldest county
- Owyhee County est. 1863
- Newest county
- Caribou County est. 1919
- State capital
- Boise Ada County
Latah County is the only Idaho county created by the U.S. Congress, in 1888.
Alturas and Logan counties were abolished in 1895 and combined to form Blaine County; Lincoln County was created two weeks later from part of the former Logan County.
List of 44 Idaho counties
Sorted A–Z. Click a column to sort, or a name to show it on the map. Download as CSV
| County | County seat | Population 2025 | Change since 2020 | Land area (sq mi) | Median income | Established | FIPS |
|---|---|---|---|---|---|---|---|
| Ada County | Boise | 546,141 | +10.3% | 1,052 | $91,502 | 1864 | 16001 |
| Adams County | Council | 5,013 | +14.5% | 1,363 | $61,808 | 1911 | 16003 |
| Bannock County | Pocatello | 91,591 | +5.3% | 1,113 | $66,499 | 1893 | 16005 |
| Bear Lake County | Paris | 6,727 | +5.7% | 976 | $75,260 | 1875 | 16007 |
| Benewah County | St. Maries | 10,508 | +10.2% | 777 | $59,794 | 1915 | 16009 |
| Bingham County | Blackfoot | 51,153 | +6.6% | 2,094 | $77,878 | 1885 | 16011 |
| Blaine County | Hailey | 25,517 | +5.1% | 2,638 | $92,566 | 1895 | 16013 |
| Boise County | Idaho City | 8,545 | +12.3% | 1,899 | $78,774 | 1864 | 16015 |
| Bonner County | Sandpoint | 54,420 | +15.5% | 1,733 | $66,979 | 1907 | 16017 |
| Bonneville County | Idaho Falls | 135,771 | +9.5% | 1,866 | $79,068 | 1911 | 16019 |
| Boundary County | Bonners Ferry | 13,997 | +16.1% | 1,269 | $67,237 | 1915 | 16021 |
| Butte County | Arco | 2,783 | +8.2% | 2,237 | $53,015 | 1917 | 16023 |
| Camas County | Fairfield | 1,316 | +22.8% | 1,074 | $57,955 | 1917 | 16025 |
| Canyon County | Caldwell | 275,123 | +19.1% | 587 | $76,488 | 1892 | 16027 |
| Caribou County | Soda Springs | 7,252 | +3.2% | 1,764 | $68,782 | 1919 | 16029 |
| Cassia County | Burley | 26,397 | +6.9% | 2,566 | $70,830 | 1879 | 16031 |
| Clark County | Dubois | 783 | −0.6% | 1,763 | $55,208 | 1919 | 16033 |
| Clearwater County | Orofino | 9,118 | +4.4% | 2,453 | $60,000 | 1911 | 16035 |
| Custer County | Challis | 4,636 | +8.4% | 4,922 | $67,574 | 1881 | 16037 |
| Elmore County | Mountain Home | 29,465 | +2.8% | 3,075 | $65,359 | 1889 | 16039 |
| Franklin County | Preston | 15,889 | +11.9% | 663 | $71,950 | 1913 | 16041 |
| Fremont County | St. Anthony | 14,208 | +6.1% | 1,864 | $72,683 | 1893 | 16043 |
| Gem County | Emmett | 21,773 | +13.8% | 560 | $64,605 | 1915 | 16045 |
| Gooding County | Gooding | 16,446 | +5.4% | 729 | $63,559 | 1913 | 16047 |
| Idaho County | Grangeville | 17,874 | +8% | 8,478 | $66,325 | 1864 | 16049 |
| Jefferson County | Rigby | 35,297 | +14.3% | 1,094 | $86,679 | 1913 | 16051 |
| Jerome County | Jerome | 26,362 | +8.8% | 598 | $71,724 | 1919 | 16053 |
| Kootenai County | Coeur d'Alene | 191,864 | +12% | 1,238 | $81,861 | 1864 | 16055 |
| Latah County | Moscow | 41,842 | +5.9% | 1,080 | $65,424 | 1888 | 16057 |
| Lemhi County | Salmon | 8,474 | +6.3% | 4,564 | $53,202 | 1869 | 16059 |
| Lewis County | Nezperce | 3,704 | +4.8% | 479 | $51,615 | 1911 | 16061 |
| Lincoln County | Shoshone | 5,603 | +9.2% | 1,201 | $71,453 | 1895 | 16063 |
| Madison County | Rexburg | 55,172 | +4.3% | 469 | $60,160 | 1913 | 16065 |
| Minidoka County | Rupert | 22,911 | +6.2% | 757 | $70,377 | 1913 | 16067 |
| Nez Perce County | Lewiston | 42,905 | +1.9% | 848 | $72,599 | 1864 | 16069 |
| Oneida County | Malad City | 5,085 | +11.4% | 1,199 | $74,954 | 1864 | 16071 |
| Owyhee County | Murphy | 12,661 | +6.3% | 7,668 | $64,406 | 1863 | 16073 |
| Payette County | Payette | 27,824 | +9.6% | 407 | $67,673 | 1917 | 16075 |
| Power County | American Falls | 8,246 | +4.7% | 1,404 | $61,146 | 1913 | 16077 |
| Shoshone County | Wallace | 14,130 | +7.3% | 2,638 | $55,527 | 1864 | 16079 |
| Teton County | Driggs | 13,254 | +13.9% | 449 | $99,805 | 1915 | 16081 |
| Twin Falls County | Twin Falls | 97,539 | +8.3% | 1,922 | $67,409 | 1907 | 16083 |
| Valley County | Cascade | 12,831 | +9.3% | 3,665 | $76,078 | 1917 | 16085 |
| Washington County | Weiser | 11,583 | +10.4% | 1,453 | $54,000 | 1879 | 16087 |
Idaho county map with cities
The largest cities in Idaho and the counties they are in. Cities that cross a county line list every county, the main one first. To find any smaller town, use the search box above.
| City | County | Population 2025 |
|---|---|---|
| Boise | Ada County | 238,429 |
| Meridian | Ada County | 142,988 |
| Nampa | Canyon County | 120,384 |
| Caldwell | Canyon County | 76,629 |
| Idaho Falls | Bonneville County | 71,785 |
| Pocatello | Bannock and Power counties | 58,771 |
| Coeur d'Alene | Kootenai County | 58,179 |
| Twin Falls | Twin Falls County | 56,216 |
| Post Falls | Kootenai County | 46,715 |
| Rexburg | Madison County | 40,334 |
| Lewiston | Nez Perce County | 34,717 |
| Eagle | Ada County | 34,658 |
| Kuna | Ada County | 31,525 |
| Moscow | Latah County | 26,721 |
| Star | Ada and Canyon counties | 20,874 |
| Ammon | Bonneville County | 20,119 |
| Hayden | Kootenai County | 17,363 |
| Chubbuck | Bannock County | 16,823 |
| Mountain Home | Elmore County | 16,779 |
| Jerome | Jerome County | 13,731 |
| Blackfoot | Bingham County | 13,361 |
| Rathdrum | Kootenai County | 13,227 |
| Garden City | Ada County | 13,047 |
| Middleton | Canyon County | 12,600 |
| Burley | Cassia and Minidoka counties | 12,409 |
| Sandpoint | Bonner County | 10,645 |
| Hailey | Blaine County | 10,053 |
| Emmett | Gem County | 8,900 |
| Payette | Payette County | 8,813 |
| Fruitland | Payette County | 7,213 |
Printable Idaho county maps (free PDF, PNG, SVG)
Every map is free to print and share. The PDFs are vector files with real text, so they stay sharp at any size and you can search them for a county name. Use 11×17 (tabloid) for the most readable labels.
Color map with names
All 44 counties labeled, county seats marked. Letter and 11×17 PDF, high-resolution PNG, editable SVG.
Map with cities
Counties with their county seat towns and major cities.
Blank outline map
County lines only, no names. For quizzes, coloring and your own notes.
Numbered map with key
A number in every county with an alphabetical key.
Black and white
Labeled map that prints well on any printer.
Population map
Counties shaded by population density (2025 estimates).
Data and GIS files
The county table as CSV, and the boundaries as GeoJSON and KML (Google Earth, Google My Maps).
How Idaho reached 44 counties
Washington Territory created Idaho's first counties to govern its gold camps. Shoshone County was set up on January 9, 1861, ahead of the Clearwater gold rush, and Idaho and Nez Perce counties followed in December 1861. Idaho Territory's first legislature created Owyhee County on December 31, 1863. Several later attempts failed: the supreme court voided Alta and Lincoln counties in 1891, a 1901 act creating Clearwater County failed in the courts, and voters rejected Selway County in 1917. The biggest wave came in the 1910s. Idaho's population roughly doubled between 1900 and 1910, from 161,772 to 325,594. The legislature then created 21 counties from 1911 to 1919, nearly half of today's 44. Caribou County, created on February 11, 1919, was the last.
County maps of neighboring states
Montana county map
Nevada county map
Oregon county map
Utah county map
Washington county map
Wyoming county map
Idaho counties: questions and answers
- How many counties are in Idaho?
- Idaho has 44 counties.
- What is the largest county in Idaho?
- By land area, Idaho County is the largest (8,478 sq mi). By population, Ada County is the largest, with 546,141 people (2025 estimate).
- What is the smallest county in Idaho?
- Payette County is the smallest by land area (406.9 sq mi). Clark County has the fewest people: 783 (2025 estimate).
- What is the wealthiest county in Idaho?
- By median household income, Teton County ranks first with $99,805 (American Community Survey 2020–2024). The lowest is Lewis County at $51,615.
- What county is Boise in?
- Boise is in Ada County.
- What county is Meridian in?
- Meridian is in Ada County.
- What county is Nampa in?
- Nampa is in Canyon County.
- How can I see county lines on Google Maps?
- Google Maps does not draw county lines. Download the KML file from the printable maps section above and import it into Google My Maps (Create a new map › Import) or open it in Google Earth to see every Idaho county boundary on top of Google's map.
- Can I use this map for free?
- Yes. The maps and files on this page are free to print, share and use in your own work, including commercial projects, under the CC BY 4.0 licence. Please credit “WhichCounty (whichcounty.com)”.
Use this map on your site
You may copy, print and publish these maps, also commercially, as long as you credit WhichCounty with a link (licence details). Paste this code to embed the map:
Sources and methodology
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000), simplified for display. Projection: Lambert conformal conic fitted to Idaho.
- Population: Census Bureau county estimates, Vintage 2025 (July 1, 2025), compared with the April 1, 2020 estimates base.
- Land area: Census Bureau 2026 Gazetteer files. Median household income: American Community Survey 2020–2024 5-year estimates.
- County seats and founding years: Wikidata (CC0), checked against state lists by WhichCounty. Cities: Census Bureau city and town estimates, Vintage 2025.
- Early Shoshone County, Reference Series No. 339 (Idaho State Historical Society)
- Counties Which No Longer Exist, Reference Series No. 11 (Idaho State Historical Society)
- Idaho Blue Book 2009-2010 (Idaho Secretary of State)
- Atlas of Historical County Boundaries: Idaho (Newberry Library)
Found an error? Tell us. Last data update: October 4, 2026.