• county
  • FIPS 16031
  • Largest town: Burley

Cassia County, Idaho

Cassia County had 25,976 residents in the Census Vintage 2024 estimate, on 2,565.6 square miles of land. It ranks 16th of 44 in Idaho by population and 9th by land area.

Population
25,976
#16 of 44 in Idaho · #1,584 in US
Area
2,565.6 sq mi
#9 of 44 in Idaho · #210 in US
Density
10 / sq mi
#22 of 44 in Idaho · #2,562 in US
Median household income
$68,267
#17 of 44 in Idaho · #1,119 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Cassia County within Idaho. Pin: Boise.

Measure from here

Tools and pages that start from Cassia County

Cassia County population, land area and income

Cassia County had 25,976 residents in the Census Vintage 2024 estimate, on 2,565.6 square miles of land. It ranks 16th of 44 in Idaho by population and 9th by land area. That works out to 10.1 people per square mile, below the US average of 96.3, and in the bottom quarter nationally.

The median county-equivalent in Idaho has 15,019 residents; Cassia County is somewhat larger.

Its SAIPE 2023 median household income of $68,267 is above the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

25,976

3144th1st

1584th of 3,144 (US)

Land area

2,566 sq mi

3144th1st

210th of 3,144 (US)

Density

10.1 / sq mi

3144th1st

2562nd of 3,144 (US)

Median household income

$68,267

3143rd1st

1119th of 3,143 (US)

Rank within Idaho (44)

Population

25,976

44th1st

16th of 44 (ID)

Land area

2,566 sq mi

44th1st

9th of 44 (ID)

Density

10.1 / sq mi

44th1st

22nd of 44 (ID)

Median household income

$68,267

44th1st

17th of 44 (ID)

How Cassia County's population changed since 2020

Cassia County gained 1,221 residents between the July 2020 and July 2024 estimates, a rise of 4.9%. That ranks 35th of 44 in Idaho for growth. The median Idaho county changed by +7.2%, and the state as a whole by +8.2%.

Since the April 2020 estimates base, Cassia County recorded 1,572 births and 1,007 deaths, a natural change of +565. Net international migration added +627 and net domestic migration, people moving to or from other US counties, came to +104. The largest single component was international migration, which added 627 people.

24.8k202025.2k202125.6k202225.8k202326.0k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
1,572
Deaths
1,007
Net international migration
+627
Net domestic migration
+104
Change, July 2023 to July 2024
+159

Where Cassia County is

The Census internal point of Cassia County is at 42.282300, -113.626300. It sits in UTM zone 12N. The map shades Idaho's 44 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Cassia County outlined. Dots are towns of 1,000+ people with residents in it.

Madison County: +5.0%Idaho County: +8.0%Benewah County: +9.9%Gooding County: +3.4%Lincoln County: +8.2%Minidoka County: +4.7%Custer County: +7.7%Boundary County: +15.6%Lemhi County: +5.5%Twin Falls County: +6.8%Franklin County: +9.5%Oneida County: +9.0%Gem County: +13.4%Shoshone County: +6.6%Fremont County: +7.3%Clearwater County: +4.6%Kootenai County: +9.0%Cassia County: +4.9%Blaine County: +3.8%Clark County: +0.1%Jerome County: +7.4%Bonner County: +13.8%Elmore County: +3.7%Caribou County: +3.2%Bonneville County: +7.1%Jefferson County: +12.1%Power County: +6.3%Lewis County: +5.8%Nez Perce County: +1.7%Ada County: +7.5%Adams County: +12.9%Valley County: +7.9%Bingham County: +5.8%Bannock County: +4.3%Owyhee County: +6.2%Washington County: +9.3%Latah County: +6.4%Teton County: +10.2%Camas County: +15.0%Boise County: +12.0%Bear Lake County: +6.5%Butte County: +5.9%Canyon County: +14.5%Payette County: +8.1%
Change 2020 to 2024
  1. < +4.7%
  2. < +6.4%
  3. < +7.7%
  4. < +9.9%
  5. ≥ +9.9%
no data

Orange pin: Cassia County internal point. Dark pin: Boise.

Internal point

Decimal
42.282300, -113.626300
DMS
42°16'56.28"N 113°37'34.68"W
UTM
12N 283452.8E 4684460.7N
Geohash
9rx0w37b7
Plus code
85J879JF+WF

Towns in Cassia County

One incorporated place of 1,000+ people has residents in Cassia County, 11,860 people together, or 46% of the county. Each figure counts only the part of the town inside Cassia County; towns marked "part" extend into another county. The largest is Burley with 11,860.

  1. 01Burley (part)11,860
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Cassia County

The Census 2024 county adjacency file lists 8 neighbors for Cassia County, including 2 across a state line. The most populous is Twin Falls County, ID, with 96,509 residents. Distances run between Census internal points in a straight line.

Distance to Boise and the nearest big city

Boise is 160.2 miles NW of Cassia County's internal point in a straight line. The nearest place of 100,000 or more is Salt Lake City, UT (population 217,783), 136.0 miles away. The nearest place of 10,000 or more is Burley, ID (population 12,211), 19.5 miles away.

Cassia County FIPS code

The FIPS code of Cassia County is 16031: state code 16 for Idaho plus county code 031. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $68,267.

Questions people ask

What is the population of Cassia County, Idaho?

The Census Vintage 2024 estimate for July 1, 2024 is 25,976. That is up 1,221 people (4.9%) from the July 2020 estimate of 24,755.

What is the FIPS code of Cassia County?

16031. The first two digits (16) are Idaho; the last three (031) identify the county.

What is the largest town in Cassia County?

Burley, with 11,860 residents inside Cassia County in 2024 (12,211 across all 2 counties it spans).

Which counties border Cassia County?

8 county-equivalents border it in the Census 2024 adjacency file: Twin Falls County, ID; Box Elder County, UT; Elko County, NV; Jerome County, ID; Blaine County, ID; Minidoka County, ID; Power County, ID; Oneida County, ID.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.