Saint Onge, SD Profile: Facts & Data

The primary coordinate point for Saint Onge is located at latitude 44.5466 and longitude -103.721 in Lawrence County. The formal boundaries for the Saint Onge Census Designated Place encompass a land area of 1.35 sq. miles and a water area of 0 sq. miles. Lawrence County is in the Mountain time zone (GMT -7).

The Saint Onge Census Designated Place has a U1 Census Class Code which indicates a census designated place with an official federally recognized name. It also has a Functional Status Code of "S" which identifies a statistical entity.

A Census Designated Place (CDP) is a statistical counterpart to a self-governing (incorporated) place such as a city, town, or village. A CDP is not a legal entity and has no governmental functions.

Saint Onge, SD Data & Demographics (As of July 1, 2025)

POPULATION
Total Population	204 (100%)
Population in Households	204 (100.0%)
Population in Families	168 (82.4%)
Population in Group Quarters¹	0
Population Density	152
Diversity Index²	27


INCOME
Median Household Income	$83,584
Average Household Income	$172,531
% of Income for Mortgage⁴	28%
Per Capita Income	$70,196
Wealth Index⁵	197
Socioeconomic Status Index⁶	High (67.1)

HOUSING
Total HU (Housing Units)	91 (100%)
Owner Occupied HU	67 (73.6%)
Renter Occupied HU	16 (17.6%)
Vacant Housing Units	8 ( 8.8%)
Median Home Value	$376,316
Average Home Value	$534,328
Housing Affordability Index³	83

HOUSEHOLDS
Total Households	83
Average Household Size	2.46
Family Households	63
Average Family Size	3.00

NOTES

Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different races or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.
The Socioeconomic Index ranges from zero (lowest relative status) to 100 (highest relative status). This measure quantifies disparities in social position of an area's inhabitants and is built from a broad range of demographic, housing, and socioeconomic inputs. More information on this measure can be found in Esri's SEI tutorial.

Saint Onge, SD - Peer Comparisons by Rank and Percentile

The table below compares Saint Onge to the other 485 incorporated cities, towns and CDPs in South Dakota by rank and percentile using July 1, 2025 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

GROWTH RATE / YEAR	2020-2025	2025-2030
Population	3.53%	0.00%
Households	1.69%	0.95%
Families		-1.30%
Median Household Income		7.29%
Per Capita Income		4.33%
Owner Occupied HU		0.30%

Variable Description	Rank	Percentile
Total Population	# 220	55th
Population Density	# 339	30th
Median Household Income	# 143	71st
Housing Affordability Index	# 277	57th
Per Capita Income	# 20	96th
Diversity Index	# 154	68th

Saint Onge, SD Profile: Facts & Data

Saint Onge, South Dakota - Basic Facts

Saint Onge, SD Data & Demographics (As of July 1, 2025)

POPULATION

INCOME

HOUSING

HOUSEHOLDS

GROWTH RATE / YEAR

Saint Onge, SD - Peer Comparisons by Rank and Percentile

Saint Onge, SD - Most Popular Things to Do

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Lawrence County