Eureka, SD demographics:
population, income, and more

Total population
778
-17.8% year-over-year change
Median household income
$47,583/yr
39.3% year-over-year change
Housing units
532
-8.6% year-over-year change

Eureka population

How many people live in Eureka

Eureka is home to 778 residents, according to the most recent Census data. Gender-wise, 47% of Eureka locals are male, and 53% are female.

Total population
778
-17.8% year-over-year change
Gender ratio
Male
47%
366
Female
53%
412
Value Percent YoY change
Male 366 47% -16.4%
Female 412 53% -18.9%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in Eureka is 63, with the population distributed as follows: about 8.6% are children under 15, then 14.6% are in the 15 to 24 age group. Adults between 25 and 44 make up 10.3% of the population, while another 19.3% fall into the 45 to 64 bracket. Finally, around 47.2% are 65 or older.

Median age
63.1
Age breakdown
Under 15
8.6%
15 to 24
14.6%
25 to 44
10.3%
45 to 64
19.3%
Over 65
47.2%
Value Percent YoY change
Under 15 67 8.6% -44.6%
15 to 24 114 14.6% -6.6%
25 to 44 80 10.3% -41.2%
45 to 64 150 19.3% -18.5%
Over 65 367 47.2% -4.2%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

At the same time, 0.8% of residents are non-citizens. There’s also a share of 4% that includes residents with two or more races.

Citizenship
U.S.-born citizens
99.2%
Non-U.S.-born citizens
0%
Non-citizens
0.8%
Value Percent YoY change
U.S.-born citizens 772 99.2% -17.0%
Non-citizens 6 0.8% -62.5%
Racial breakdown
White
95.1%
Black or African American
0%
American Indian and Alaska Native
0.4%
Asian
0%
Native Hawaiian and other Pacific Islander
0.5%
Two or more races
4%
Other
0%
Value Percent
White 740 95.1%
American Indian and Alaska Native 3 0.4%
Native Hawaiian and other Pacific Islander 4 0.5%
Two or more races 31 4%

Households in Eureka

A peek inside Eureka households

Eureka has 400 households, with an average of 2 members in each. Of these, 46% are families, while the remaining 54% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
400
-3.9% year-over-year change
Average people per household
2
Non-family households
216
Family households
184
Value Percent YoY change
Non-family households 216 54% 3.4%
Family households 184 46% -11.1%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in Eureka

The housing landscape of Eureka

Eureka's housing consists of 532 units, with 79.9% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 2.4% and offer a more compact, shared living style. Then there are the multifamily buildings in the area, and for those seeking flexibility, non-traditional options like mobile homes account for 2.8% of the housing landscape.

Housing units
532
-8.6% year-over-year change
Housing types
Value Percent
1 unit, detached 425 79.9%
1 unit, attached 13 2.4%
3 or 4 units 49 9.2%
10 to 19 units 7 1.3%
20 to 49 units 19 3.6%
Mobile home 15 2.8%
Boat, RV, van, etc. 4 0.8%
Homes built since 2020
0
% year-over-year change

The age of buildings in Eureka

In Eureka, the median construction year is 1958. About 33.3% of homes were built before the 1940s, with another 6.8% going up by 1949. Most development happened in the second half of the 20th century.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 177 33.3% -9.2%
Built between 1940 and 1949 36 6.8% 16.1%
Built between 1950 and 1959 65 12.2% -46.3%
Built between 1960 and 1969 114 21.4% -11.6%
Built between 1970 and 1979 57 10.7% 11.8%
Built between 1980 and 1989 62 11.6% 51.2%
Built between 1990 and 1999 7 1.3% -22.2%
Built between 2000 and 2009 14 2.6% 180.0%
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

Eureka occupancy rates

Out of the 400 occupied housing units in Eureka, 81.8% are owner-occupied, while 18.2% are lived in by tenants. Meanwhile, 24.8% of all homes on the local market sit vacant.

Occupied housing units
400
-3.9% year-over-year change
Occupancy breakdown
Renter occupied
73
Owner occupied
327
Value Percent YoY
change
Renter occupied 73 18.2% -14.1%
Owner occupied 327 81.8% -1.2%
Unoccupied housing units
24.8%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

Eureka housing costs

Housing costs in Eureka come to a median of $583 per month, while tenants specifically pay a median gross rent of $557.

Median housing costs per month
$583/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in Eureka
$557/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in Eureka

Eureka education at a glance

About 34.6% of the population in Eureka went to high school, while 9.4% pursued college studies. Another 18.3% earned an associate degree and 19.5% hold a bachelor’s. Meanwhile, 1.9% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 109 16.2% -8.4%
High school diploma 232 34.6% -32.4%
College diploma 63 9.4% 0.0%
Associate degree 123 18.3% 8.8%
Bachelor's degree 131 19.5% 27.2%
Graduate degree 13 1.9% -71.1%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in Eureka

How much people earn in Eureka

The average annual household income in Eureka was $88,841 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +14.2% change from the previous year. At the same time, the median income stood at $47,583, reflecting a +39.3% shift over the same period.

Average household income in Eureka
$88,841/year
14.2% year-over-year change
Median household income in Eureka
$47,583/year
39.3% year-over-year change

Eureka income by age

In Eureka, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $71,500. Those with someone between 45 and 64 in charge, often well established professionally, earn $100,417 overall. Younger households, where the main provider is under 25 and just starting out, report a median income of $49,500, while those led by someone over 65, many of whom may be retired, have about $30,500 in earnings. Overall, 84.6% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Under 25 $49,500 80.5%
25 - 44 $71,500 -0.2%
45 - 64 $100,417 42.6%
Over 65 $30,500 11.4%
Above poverty level
567
Below poverty level
103
Value Percent YoY
change
Above poverty level 567 84.6% -19.5%
Below poverty level 103 15.4% -24.8%

Average renter income in Eureka

To get a better sense of what renters earn on average in Eureka, their median household income was $26,563 according to 2022 Census data. In addition, the rent-to-income ratio in the area, at 25.2%, shows what portion of their earnings goes toward housing expenses.

Renter median household income
$26,563
Rent-to-income ratio
25.2%
Understanding the rent-to-income ratio can help renters gauge if local housing costs align with their earnings. A ratio under 30% usually signals affordability, while exceeding this mark means rent is taking a larger-than-recommended bite out of income. That could make it harder for you to cover other costs like transportation, healthcare, or child care.

Employment in Eureka

Workforce and job types in Eureka

The job market in Eureka is powered by 313 working residents, spread across a range of industries and roles. 77.3% of the working population are employed in professional or administrative positions, while 22.7% are in hands-on or service-based jobs. Also, 19.8% run their own businesses, 42.5% are employed by private companies, and 27.2% work in the public sector.

Workforce demographics

Working population
313
-23.3% year-over-year change
White collar
242
Blue collar
71
Value Percent YoY change
White collar 242 77.3% -17.4%
Blue collar 71 22.7% -38.3%
Employer type
Self employees
19.8%
Private companies
42.5%
Governmental workers
27.2%
Not for profit companies
10.5%
Value Percent YoY change
Self employees 62 19.8% -16.2%
Private companies 133 42.5% -38.7%
Governmental workers 85 27.2% 25.0%
Not for profit companies 33 10.5% -32.6%
Unemployment rate
0.3%

Available workforce

The unemployment rate in Eureka stands at 0.3%, representing the share of the workforce currently without a job and actively looking for one.

For renters, the unemployment rate helps paint a picture of job security and financial stability in the area. Rates around 4% to 5% are considered typical. A lower-than-average rate might suggest strong job prospects and a thriving local economy, while a higher rate could hint at fewer opportunities—both useful to consider when planning a move.

Transportation in Eureka

How people get around in Eureka

Commuting methods vary: 91.7% of residents travel by personal vehicle and 8% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Means of transportation
Value Percent YoY change
Car 287 91.7% -19.8%
Walk 25 8% -40.5%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in Eureka by zipcode?

Zipcode Population Number of households Median income Average income
57437 1,074 556 $49,276 $102,125

Explore more communities

FAQs about Eureka demographics 

What is the total population of Eureka?

Eureka has a total population of 778 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by -17.8% compared to a year ago.

What is the gender ratio in Eureka?

The gender ratio in Eureka is as follows:
  • 47% males (366 residents)
  • 53% females (412 residents)

What is the median age in Eureka?

The median age in Eureka is 63.1.

What is the age distribution of the population in Eureka?

The age distribution in Eureka is as follows:
  • Under 15: 8.6% (67 residents)
  • Ages 15-24: 14.6% (114 residents)
  • Ages 25-44: 10.3% (80 residents)
  • Ages 45-64: 19.3% (150 residents)
  • Over 65: 47.2% (367 residents)

What is the racial and ethnic makeup of Eureka?

The racial and ethnic makeup of Eureka is as follows:
  • White: 95.1% (740 residents)
  • Black or African American: 0% (0 residents)
  • American Indian and Alaska Native: 0.4% (3 residents)
  • Asian: 0% (0 residents)
  • Native Hawaiian and Other Pacific Islander: 0.5% (4 residents)
  • Two or More Races: 4% (31 residents)
  • Other: 0% (0 residents)

What percentage of the population in Eureka are U.S.-born citizens?

U.S.-born citizens represent 99.2% of the population in Eureka.

How many housing units are there in Eureka?

There are 532 housing units in Eureka, reflecting a -8.6% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in Eureka and what is the average household size?

Eureka has a total of 400 households, with an average of 2 people in each.

What is the median household income in Eureka?

Eureka has a median household income of $47,583, representing a +39.3% shift from the previous year, according to the U.S. Census Bureau.

What is the employment rate and job market overview for Eureka?

The employment rate is 99.7% in Eureka, with a workforce of 313 residents. Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 77.3% (242 residents)
  • Blue-collar workers: 22.7% (71 residents)

Places of employment:
  • Self-employed: 19.8% (62 residents)
  • Private companies: 42.5% (133 residents)
  • Governmental workers: 27.2% (85 residents)
  • Not-for-profit companies: 10.5% (33 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025