Seneca, SD demographics:
population, income, and more

Total population
22
-15.4% year-over-year change
Median household income
$/yr
% year-over-year change
Housing units
26
-13.3% year-over-year change

Seneca population

How many people live in Seneca

Seneca is home to 22 residents, according to the most recent Census data. Gender-wise, 68.2% of Seneca locals are male, and 31.8% are female.

Total population
22
-15.4% year-over-year change
Gender ratio
Male
68.2%
15
Female
31.8%
7
Value Percent YoY change
Male 15 68.2% -16.7%
Female 7 31.8% -12.5%
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

Adults between 25 and 44 make up 9.1% of the population, while another 36.4% fall into the 45 to 64 bracket. Finally, around 54.6% are 65 or older.

Median age
67.3
Age breakdown
Under 15
0%
15 to 24
0%
25 to 44
9.1%
45 to 64
36.4%
Over 65
54.6%
Value Percent YoY change
25 to 44 2 9.1% 100.0%
45 to 64 8 36.4% -55.6%
Over 65 12 54.6% 71.4%
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

In Seneca, 68.2% of the population are US-born citizens, while 31.8% have gained naturalized citizenship.

Citizenship
U.S.-born citizens
68.2%
Non-U.S.-born citizens
31.8%
Non-citizens
0%
Value Percent YoY change
U.S.-born citizens 15 68.2% -28.6%
Non-U.S.-born citizens 7 31.8% 40.0%
Racial breakdown
White
100%
Black or African American
0%
American Indian and Alaska Native
0%
Asian
0%
Native Hawaiian and other Pacific Islander
0%
Two or more races
0%
Other
0%
Value Percent
White 22 100%

Households in Seneca

A peek inside Seneca households

Seneca has 13 households, with an average of 2 members in each. Of these, 46.2% are families, while the remaining 53.8% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
13
-23.5% year-over-year change
Average people per household
2
Non-family households
7
Family households
6
Value Percent YoY change
Non-family households 7 53.8% -36.4%
Family households 6 46.2% 0.0%
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 Seneca

The housing landscape of Seneca

Seneca's housing consists of 26 units, with 100% being detached single-family homes ideal for those wanting space.

Housing units
26
-13.3% year-over-year change
Housing types
Value Percent
1 unit, detached 26 100%
Homes built since 2020
0
% year-over-year change

The age of buildings in Seneca

In Seneca, the median construction year is 1938. 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 21 80.8% -22.2%
Built between 1980 and 1989 2 7.7% 100.0%
Built between 1990 and 1999 2 7.7% 100.0%
Built between 2010 and 2019 1 3.8% 0.0%
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.

Seneca occupancy rates

Meanwhile, 50% of all homes on the local market sit vacant.

Occupied housing units
13
-23.5% year-over-year change
Occupancy breakdown
Renter occupied
0
Owner occupied
13
Value Percent YoY
change
Owner occupied 13 100% -23.5%
Unoccupied housing units
50.0%
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.

Seneca housing costs

Median housing costs per month
$313/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.

Education in Seneca

Seneca education at a glance

Education level
Value Percent YoY change
No high school 5 22.7% 25.0%
High school diploma 6 27.3% -57.1%
Associate degree 11 50% 37.5%
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 Seneca

How much people earn in Seneca

The average annual household income in Seneca was $29,138 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a -16.2% change from the previous year.

Average household income in Seneca
$29,138/year
-16.2% year-over-year change

Seneca income by age

Overall, 72.7% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Above poverty level
16
Below poverty level
6
Value Percent YoY
change
Above poverty level 16 72.7% -23.8%
Below poverty level 6 27.3% 20.0%

Employment in Seneca

Workforce and job types in Seneca

The job market in Seneca is powered by 6 working residents, spread across a range of industries and roles. Also, 16.7% run their own businesses, 66.7% are employed by private companies, and 16.7% work in the public sector.

Workforce demographics

Working population
6
-45.5% year-over-year change
White collar
6
Blue collar
0
Value Percent YoY change
White collar 6 100% -14.3%
Employer type
Self employees
16.7%
Private companies
66.7%
Governmental workers
16.7%
Not for profit companies
0%
Value Percent YoY change
Self employees 1 16.7% 0.0%
Private companies 4 66.7% -55.6%
Governmental workers 1 16.7% 0.0%

Transportation in Seneca

How people get around in Seneca

Commuting methods vary: 83.3% of residents travel by personal vehicle and 16.7% 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 5 83.3% -50.0%
Walk 1 16.7% 0.0%
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 Seneca by zipcode?

Zipcode Population Number of households Median income Average income
57473 246 91 $23,750 $30,673

Explore more communities

FAQs about Seneca demographics 

What is the total population of Seneca?

Seneca has a total population of 22 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 -15.4% compared to a year ago.

What is the gender ratio in Seneca?

The gender ratio in Seneca is as follows:
  • 68.2% males (15 residents)
  • 31.8% females (7 residents)

What is the median age in Seneca?

The median age in Seneca is 67.3.

What is the age distribution of the population in Seneca?

The age distribution in Seneca is as follows:
  • Under 15: 0% (0 residents)
  • Ages 15-24: 0% (0 residents)
  • Ages 25-44: 9.1% (2 residents)
  • Ages 45-64: 36.4% (8 residents)
  • Over 65: 54.6% (12 residents)

What is the racial and ethnic makeup of Seneca?

The racial and ethnic makeup of Seneca is as follows:
  • White: 100% (22 residents)
  • Black or African American: 0% (0 residents)
  • American Indian and Alaska Native: 0% (0 residents)
  • Asian: 0% (0 residents)
  • Native Hawaiian and Other Pacific Islander: 0% (0 residents)
  • Two or More Races: 0% (0 residents)
  • Other: 0% (0 residents)

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

U.S.-born citizens represent 68.2% of the population in Seneca.

How many housing units are there in Seneca?

There are 26 housing units in Seneca, reflecting a -13.3% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

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

Seneca has a total of 13 households, with an average of 2 people in each.

What is the job market overview for Seneca?

Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 100% (6 residents)
  • Blue-collar workers: 0% (0 residents)

Places of employment:
  • Self-employed: 16.7% (1 residents)
  • Private companies: 66.7% (4 residents)
  • Governmental workers: 16.7% (1 residents)
  • Not-for-profit companies: 0% (0 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