Jefferson County, Idaho Population and Demographics

In this article, we'll explore the population statistics for Jefferson County, Idaho, including popular demographics data like median age, number of households, household income, gender, employment and unemployment rates, occupations, religion, and more.

We are using the latest American Community Survey (ACS) 5-Year survey data from the US Census Bureau, which is accurate up to 2021.

Table of Contents

Population

There is a lot of data that lets us see how many people live in Jefferson County, Idaho. The most basic data is the total population, which is the total number of people living in Jefferson County, Idaho. The estimated population of Jefferson County, Idaho is 30,427 people, with a median age of 31.9.

We can look at the total population in Jefferson County over the last 5 years to see how much it has changed.

Year Population Change 5-Year Change
2021
30,427
+4.07%
+11.01%
2020
29,238
+2.47%
-
2019
28,534
+2.02%
-
2018
27,969
+2.04%
-
2017
27,410
 - -

Population of Jefferson County, Idaho by Race and Ethnicity

We can also look at how the population has changed over the last 5 years by each of the race/ethnicity types as defined by the US Census Bureau.

Race 2021 2017 Change
White
86.1%
87.1%
 -1.15%
Black/African American
0%
0.1%
 -100.00%
Native
0.8%
0.3%
 +166.67%
Hispanic
10.6%
10.4%
 +1.92%
Asian
0.3%
0.3%
 0.00%
Hawaiian/Pacific Islander
0%
0.2%
 -100.00%
Two Or More Races
1.8%
1.6%
 +12.50%
Other
0.4%
0%
 0.00%

This data can be very important for a number of reasons, including social and economic research, planning and development, and marketing to a multi-cultural population.

Note that the Native group includes both Native American and Alaskan Native people.

Population of Jefferson County, Idaho by Age and Gender

The age and gender of a population is another interesting demographic statistic because it lets us track trends in the population over time. For example, we can see how the population has changed over the last 5 years by median age as a total, and also by male and female.

Year Total Male Female
2021 31.9 0% 32 +1.27% 31.9 -1.24%
2020 31.9 +1.27% 31.6 +0.64% 32.3 +2.54%
2019 31.5 +0.96% 31.4 +1.62% 31.5 0%
2018 31.2 -0.32% 30.9 0% 31.5 -0.63%
2017 31.3 - 30.9 - 31.7 -

The median age of Jefferson County, Idaho gives you an idea of the age distribution, with half of the population being older than the median age and half being younger.

This can then be used to infer and compare against birth rates, parent ages, and more metrics to understand the population. For example, an increasing median age indicates an aging population, which can be a sign of a declining population in terms of birth rates and workforce participation.

Age 2021 2017
(Years) Male Female Male Female
0 to 9 2,580 +3.57% 2,687 -2.52% 2,657 2,604
10 to 19 2,662 +13.15% 2,308 +22.95% 3,023 2,877
20 to 29 1,590 +9.08% 1,512 +10.88% 1,733 1,683
30 to 39 1,839 +3.42% 1,841 +11.01% 1,895 2,049
40 to 49 1,499 +32.3% 1,409 +19.5% 2,026 1,704
50 to 59 1,506 +3.41% 1,595 -2.71% 1,549 1,551
60 to 69 1,310 +26.55% 1,089 +27.94% 1,661 1,420
70+ 925 -3.19% 1,058 +4.44% 891 1,104

Median Household Income

The latest median household income of Jefferson County, Idaho is $69,097.00.

In simple terms, the median income is the middle income of a group of people. Half of the people in the group make more than the median income, and half make less. The median income is a good indicator of the overall income of a group of people, and can be used to compare against other metrics such as the average income, per capita income, and more.

Median Income by Age

We can also look at the median income by age to see how the median income varies by age, and how it compares to the overall median income for Jefferson County.

  • Under 25
    $55,417.00
  • 25 to 44
    $68,856.00
  • 45 to 64
    $83,868.00
  • 65 and over
    $49,808.00

Average Household Income

Whenever we ask what is the average household income in Jefferson County, we are actually talking about the mean household income.

This is calculated by adding up all the incomes of all the households in Jefferson County, and then dividing that number by the total number of households. This is a good way to get a general idea of the average income of a group of people, but it can be skewed by a very high or very low incomes.

The average household income of Jefferson County, Idaho is currently $83,354.00.

In terms of accurately summarizing income at a geographic level, the median income is a better metric than the average income because it isn't affected by a small number of very high or very low incomes.

If you had an area where the average income was greater than the median, it can mean that there is significant income inequality, with income being concentrated in a small number of wealthy households.

5.52% of households in Jefferson County are classed as high income households (making $200,000+ per year).

Household Income Tiers

The US Census Bureau divides households into income tiers based on the median income for the area. This is a good way to compare the income of Jefferson County against other areas.

  • Less than $24,999
    10.66%
  • $25,000 to $49,999
    19.61%
  • $50,000 to $74,999
    24.39%
  • $75,000 to $99,999
    16.52%
  • $100,000 to $149,999
    18.75%
  • $150,000 to $199,999
    4.55%
  • $200,000 or more
    5.52%

Per Capita Income

The per capita income in Jefferson County is $26,438.00.

Per capita income is the average income of a person in a given area. It is calculated by dividing the total income of Jefferson County by the total population of Jefferson County.

This is different from the average or mean income because it includes and accounts for all people in Jefferson County, Idaho, including people like children, the elderly, unemployed people, retired people, and more.

Education Levels

We can also look at the education levels in Jefferson County to see how many people have a high school degree, a bachelor's degree, or a graduate degree.

Educational attainment is a good indicator of the overall education level of a population, and can be used to compare against other metrics such as the average income, per capita income, and more to see how education levels affect income, unemployment rates, and more.

  • Master's degree or higher
    12.57%
  • Bachelor's degree
    31.10%
  • Some college or associate's degree
    13.87%
  • High school diploma or equivalent
    39.47%
  • Less than high school diploma
    2.99%

Employment

Employment rates are all based around the total population in Jefferson County that are over the age of 16.

The total population of Jefferson County over the age of 16 is 21,317.

Of those people, a total of 67.00% are working or actively looking for work. This is called the labor force participation rate.

The participation rate is a useful market measure because it shows the relative amount of labor resources available to the economy.

The employment to total population rate in Jefferson County is 64.70%.

Employment by Age

We can look at the employment rates by age to see how it compares to the overall employment rate.

Age Population Participation Unemployment Rate
16 to 19 years 2,051 64.00% 7.20%
20 to 24 years 1,756 75.90% 7.40%
25 to 29 years 1,660 85.50% 12.00%
30 to 34 years 1,823 72.40% 1.60%
35 to 44 years 4,190 75.90% 0.80%
45 to 54 years 3,210 88.00% 1.40%
55 to 59 years 1,551 74.90% 0.50%
60 to 64 years 1,685 62.70% 0.10%
65 to 74 years 2,194 26.40% 7.80%
75 years and over 1,197 8.50% 0.00%

Employment by Race

Another very interesting employment statistic we can look at is the employment and unemployment rates by race in Jefferson County. The table below shows the rates for each of the ethnicity groups types defined by the US Census Bureau.

Age Population Participation Unemployment Rate
White 19,197 65.70% 3.50%
Black or African American 21 76.20% 0.00%
American Indian and Alaska Native 227 90.70% 0.00%
Asian 89 100.00% 0.00%
Native Hawaiian and Other Pacific Islander 0 0.00% 0.00%
Other 1,032 72.80% 2.30%
Two or more races 751 83.00% 7.20%
Hispanic or Latino 2,039 76.40% 5.50%
Not Hispanic or Latino 18,622 65.50% 3.10%

Occupations

In this section we can look at the most common occupations in Jefferson County as well as the gender breakdown and earnings of them.

The total population of civilian employees that are 16 years old or older in Jefferson County is 13,785, with median earnings of $35,896.00.

Women in Jefferson County, Idaho earning approximately 53.30% of the men's earnings.

Population Earnings
Total 13,785 $35,896.00
Male 8,372 $44,128.00
Female 5,413 $23,534.00

Occupations by Category

In the table below, we can break down the population and earnings even further by occupation. The list of occupation categories below will show you how many people are employed in each category and the median earnings of each profession.

Occupation Employed Earnings
Management 1,817 $66,294.00
Business and Financial 559 $51,836.00
Computer and Mathematical 158 $97,857.00
Architecture and Engineering 409 $49,408.00
Life, Physical, and Social Science 111 $60,625.00
Community and Social Service 167 $22,031.00
Legal 0 $0.00
Educational and Library 1,086 $39,820.00
Arts, Design, Entertainment, Sports, and Media 245 $12,402.00
Healthcare Practitioners 795 $29,456.00
Healthcare Support 435 $20,246.00
Firefighters and Protective Service 92 $105,500.00
Law Enforcement 91 $56,144.00
Food Preparation and Serving 491 $7,285.00
Building and Grounds Cleaning 635 $4,230.00
Personal Care and Service 279 $7,782.00
Sales 1,187 $27,031.00
Office and Administrative Support 1,358 $29,286.00
Farming, Fishing, and Forestry 556 $28,125.00
Construction and Extraction 979 $32,340.00
Installation, Maintenance, and Repair 464 $42,556.00
Production 701 $27,023.00
Transportation and Material Moving 733 $40,625.00

Occupations by Gender

The table below shows the same occupations from the list above, but we have split them by male and female to see how many male and females work in each occupation, the median earnings, and the male to female ratio of earnings.

That last metric is important because it can be used to look at the gender pay gap between men and women.

Occupation Male Female
Population Earnings Population Earnings
Management 1,411 $77,953.00 406 $37,440.00
Business and Financial 336 $84,300.00 223 $26,250.00
Computer and Mathematical 109 $84,219.00 49 $120,969.00
Architecture and Engineering 394 $49,561.00 15 $38,750.00
Life, Physical, and Social Science 75 $83,472.00 36 $21,875.00
Community and Social Service 135 $17,150.00 32 $30,750.00
Legal 0 $0.00 0 $0.00
Educational and Library 216 $50,326.00 870 $39,746.00
Arts, Design, Entertainment, Sports, and Media 107 $56,063.00 138 $10,955.00
Healthcare Practitioners 319 $27,278.00 476 $29,879.00
Healthcare Support 38 $2,499.00 397 $20,701.00
Firefighters and Protective Service 91 $105,583.00 1 $0.00
Law Enforcement 77 $55,771.00 14 $0.00
Food Preparation and Serving 177 $18,125.00 314 $5,930.00
Building and Grounds Cleaning 548 $4,087.00 87 $15,125.00
Personal Care and Service 26 $41,667.00 253 $7,440.00
Sales 630 $52,708.00 557 $16,826.00
Office and Administrative Support 295 $37,117.00 1,063 $25,631.00
Farming, Fishing, and Forestry 459 $35,202.00 97 $9,313.00
Construction and Extraction 938 $33,103.00 41 $2,499.00
Installation, Maintenance, and Repair 464 $42,556.00 0 $0.00
Production 456 $45,119.00 245 $25,536.00
Transportation and Material Moving 723 $41,875.00 10 $12,500.00

Households and Family Size

A household defined bu the US Census Bureau is a group of people who occupy a housing unit. A housing unit is a house, apartment, mobile home, group of rooms, or single room occupied as separate living quarters.

There are currently 9,345 households in Jefferson County, with an average household size of 3.25 people.

A family is defined as a group of two or more people related by birth, marriage, or adoption who live together in the same household.

There are 7,545 families in Jefferson County with an average family size of 3.69 people.

Households by Marital Status

The four categories of household by marital status are:

  • Married-couple family
  • Male householder with no spouse present
  • Female household with no spouse present
  • Nonfamily household

The table below shows the total number of households and families, with the average sizes of each.

Married Male Female Nonfamily
Total Households 6,810 219 516 1,800
Average Household Size 3.8 3.21 3.16 1.19
Total Families 6,810 219 516 0
Average Household Size 3.77 2.94 2.95 0

Poverty

Of the 7,545 families in Jefferson County, 5.90% are considered to be below the poverty threshold.

The table below shows the latest poverty thresholds in Jefferson County:

Household Size Poverty Threshold
1 Person $14,580.00
2 People $19,720.00
3 People $24,860.00
4 People $30,000.00
5 People $35,140.00
6 People $40,280.00
7 People $45,420.00
8 People $50,560.00

Housing

There are 9,953 housing units in Jefferson County, Idaho.

The table below shows the split between occupied and vacant units:

Total Percentage
Occupied 9,345 93.89%
Vacant 608 6.11%

13.60% of the total 9,953 housing units in Jefferson County are rental units. This is approximately 1,354 properties.

For owner-occupied housing units, a total of 7,700 are occupied by the owner - or 77.36% of the total.

Rental Rates

The median rent for a property in Jefferson County is $890.00.

In the chart below, we can look at the number of rental properties in Jefferson County that fall into a particular rent range. These can then be used to compare with other areas, or to see how they have changed over time.

  • No rent paid
    291
  • Less than $500
    58
  • $500 to $999
    971
  • $1,000 to $1,499
    262
  • $1,500 to $1,999
    54
  • $2,000 to $2,499
    9
  • $2,500 to $2,999
    0
  • $3,000 or more
    0

Property Value

The median value of a property in Jefferson County is $245,100.00.

Just like with rental rates, we can look at the number of properties in Jefferson County that fall into a particular value range.

  • Less than $50,000
    409
  • $50,000 to $99,999
    496
  • $100,000 to $149,999
    1,087
  • $150,000 to $199,999
    887
  • $200,000 to $299,999
    2,306
  • $300,000 to $499,999
    1,694
  • $500,000 to $999,999
    757
  • $1,000,000 or more
    64

Property Age

We can also look at the age of properties in Jefferson County. The chart below shows the number of properties in Jefferson County that fall into a particular age range.

  • 1939 or earlier
    1,059
  • 1940 to 1949
    486
  • 1950 to 1959
    550
  • 1960 to 1969
    566
  • 1970 to 1979
    1,644
  • 1980 to 1989
    986
  • 1990 to 1999
    904
  • 2000 to 2009
    2,503
  • 2010 to 2013
    1,231
  • 2014 or later
    24

Vehicles per Household

The number of vehicles available per household can be a good indicator of the level of affluence in an area. The chart below shows the number of households in Jefferson County that have a particular number of vehicles available.

  • No vehicles available
    90
  • 1 vehicle available
    1,216
  • 2 vehicles available
    3,666
  • 3 or more vehicles available
    4,373

Commuting to Work

In this section, we can also look at how people in Jefferson County get to work. The chart below shows the number of people in Jefferson County that commute to work in a particular way.

23.2 minutes is the average travel time to work for people in Jefferson County.

These commute times can be compared to other date like income and educational levels to see how they relate to each other and if there are any trends in the data that might suggest a correlation.

  • Less than 5 minutes
    947
  • 5 to 9 minutes
    1,448
  • 10 to 14 minutes
    1,268
  • 15 to 19 minutes
    1,350
  • 20 to 24 minutes
    2,876
  • 25 to 29 minutes
    1,460
  • 30 to 34 minutes
    1,640
  • 35 to 39 minutes
    143
  • 40 to 44 minutes
    325
  • 45 to 59 minutes
    330
  • 60 to 89 minutes
    509
  • 90 or more minutes
    285

Summary

We've covered a LOT of demographic and population data for Jefferson County, Idaho in this article! Hopefully you have found it very useful in your research of the area.

If you use any of the data found on this page, please consider linking back to USPopulation.org as the source and if you have any feedback or data requests, click here to contact us.

Places in Jefferson County, Idaho

We have data for 11 places in Jefferson County, Idaho. Click on a place below to see more information about the demographics of that place.