Blank map of Idaho by county
All 44 counties of Idaho, ready to print on Letter, Tabloid, A4 or A3, or to download as PNG and SVG. Free, no sign-up.
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Mapsfera · data US Census Bureau
Idaho on the map
Idaho has 44 counties; only 18 states have fewer. The largest is Idaho, with 8,477 sq mi of land, and the smallest is Payette, with 407 sq mi: Idaho is about 21 times bigger.
The state capital, Boise, is in Ada County. The capital version marks it on the map.
Ada County is the most populous, with 546,141 people in 2025, or 27% of the state. The least populous is Clark, with 783.
What each county borders
Blaine borders the most counties in the state: 9 (Bingham, Butte, Camas, Cassia, Custer, Elmore, Lincoln, Minidoka, and Power).
25 counties touch another state. 8 border Montana: Bonner, Boundary, Clark, Clearwater, Fremont, Idaho, Lemhi, and Shoshone. 7 border Oregon: Adams, Canyon, Idaho, Nez Perce, Owyhee, Payette, and Washington. 6 border Washington: Benewah, Bonner, Boundary, Kootenai, Latah, and Nez Perce. 5 border Wyoming: Bear Lake, Bonneville, Caribou, Fremont, and Teton. 4 border Utah: Bear Lake, Cassia, Franklin, and Oneida. 3 border Nevada: Cassia, Owyhee, and Twin Falls.
Only Boundary borders Canada.
None has a coastline: Idaho is landlocked.
Number key
Numbers follow alphabetical order, from 1 (Ada) to 44 (Washington). Canyon, Payette, and Teton are too small for a number on Letter or A4 but keep their number in the table; Tabloid and A3 fit more. Area is land area, without lakes or sea, and population is the Census estimate for July 1, 2025; “Borders” counts neighboring counties in the same state.
Show the whole table (44 rows)
| No. | County | Land area | Population (2025) | Borders |
|---|---|---|---|---|
| 1 | Ada | 1,052 sq mi | 546,141 | 5 |
| 2 | Adams | 1,363 sq mi | 5,013 | 4 |
| 3 | Bannock | 1,112 sq mi | 91,591 | 5 |
| 4 | Bear Lake | 976 sq mi | 6,727 | 2 |
| 5 | Benewah | 777 sq mi | 10,508 | 3 |
| 6 | Bingham | 2,094 sq mi | 51,153 | 7 |
| 7 | Blaine | 2,638 sq mi | 25,517 | 9 |
| 8 | Boise | 1,899 sq mi | 8,545 | 5 |
| 9 | Bonner | 1,733 sq mi | 54,420 | 3 |
| 10 | Bonneville | 1,866 sq mi | 135,771 | 5 |
| 11 | Boundary | 1,269 sq mi | 13,997 | 1 |
| 12 | Butte | 2,236 sq mi | 2,783 | 6 |
| 13 | Camas | 1,074 sq mi | 1,316 | 4 |
| 14 | Canyon | 587 sq mi | 275,123 | 4 |
| 15 | Caribou | 1,764 sq mi | 7,252 | 5 |
| 16 | Cassia | 2,566 sq mi | 26,397 | 6 |
| 17 | Clark | 1,763 sq mi | 783 | 4 |
| 18 | Clearwater | 2,457 sq mi | 9,118 | 5 |
| 19 | Custer | 4,922 sq mi | 4,636 | 6 |
| 20 | Elmore | 3,075 sq mi | 29,465 | 8 |
| 21 | Franklin | 663 sq mi | 15,889 | 4 |
| 22 | Fremont | 1,864 sq mi | 14,208 | 4 |
| 23 | Gem | 560 sq mi | 21,773 | 7 |
| 24 | Gooding | 729 sq mi | 16,446 | 5 |
| 25 | Idaho | 8,477 sq mi | 17,874 | 6 |
| 26 | Jefferson | 1,094 sq mi | 35,297 | 6 |
| 27 | Jerome | 598 sq mi | 26,362 | 5 |
| 28 | Kootenai | 1,238 sq mi | 191,864 | 3 |
| 29 | Latah | 1,076 sq mi | 41,842 | 4 |
| 30 | Lemhi | 4,564 sq mi | 8,474 | 5 |
| 31 | Lewis | 479 sq mi | 3,704 | 3 |
| 32 | Lincoln | 1,201 sq mi | 5,603 | 5 |
| 33 | Madison | 469 sq mi | 55,172 | 4 |
| 34 | Minidoka | 757 sq mi | 22,911 | 4 |
| 35 | Nez Perce | 848 sq mi | 42,905 | 4 |
| 36 | Oneida | 1,199 sq mi | 5,085 | 4 |
| 37 | Owyhee | 7,668 sq mi | 12,661 | 4 |
| 38 | Payette | 407 sq mi | 27,824 | 3 |
| 39 | Power | 1,404 sq mi | 8,246 | 5 |
| 40 | Shoshone | 2,637 sq mi | 14,130 | 5 |
| 41 | Teton | 449 sq mi | 13,254 | 3 |
| 42 | Twin Falls | 1,922 sq mi | 97,539 | 5 |
| 43 | Valley | 3,665 sq mi | 12,831 | 6 |
| 44 | Washington | 1,453 sq mi | 11,583 | 3 |
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Frequently asked questions
How many counties does Idaho have?
44 counties. Only 18 states have fewer.
What is the largest county in Idaho?
Idaho, with 8,477 sq mi of land. The smallest is Payette, with 407 sq mi.
What is the most populous county in Idaho?
Ada County, with an estimated 546,141 people in 2025, or 27% of the state.
What county is Boise in?
The state capital, Boise, is in Ada County.
Which Idaho counties border Canada?
1 county: Boundary.
Can I use it in class?
Yes, it’s free. Print it, copy it and hand it out as many times as you like. If you post it on a blog or a class website, credit “Mapsfera · data US Census Bureau”.
How do I print it on US Letter paper?
Choose Letter in “Paper size” and click “Download PDF”. In the print window, pick Letter paper and 100% scale (“Actual size”). For a bigger map, choose Tabloid (11 × 17 in) or A3.
What order are the numbers in?
Alphabetical, from 1 to the last one. That makes the key easy to follow when you grade, and it’s the same key the worksheet’s answer page uses.
Sources
- Boundaries: U.S. Census Bureau, Cartographic Boundary Files 2025, counties at 1:500,000 (public domain)
- Land and water area: U.S. Census Bureau (TIGER/Line and 2025 Gazetteer); population: Vintage 2025 estimates (July 1, 2025)
- State capital: Natural Earth, Populated Places (public domain); which counties it spans, Census places
- Neighbors, coastline and borders: calculated from those boundaries (and checked against the Census county adjacency file)