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Castlewood, SD Profile: Facts & Data

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Castlewood, South Dakota - Basic Facts

The City of Castlewood had a population of 835 as of July 1, 2025.

The primary coordinate point for Castlewood is located at latitude 44.7227 and longitude -97.0301 in Hamlin County. The formal boundaries for the City of Castlewood encompass a land area of 1.15 sq. miles and a water area of 0 sq. miles. Hamlin County is in the Central time zone (GMT -6).

The City of Castlewood has a C5 Census Class Code which indicates an active incorporated place that is independent of any county subdivision and serves as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.


Jump to... (On This Page!)
  1. Castlewood 2025 Demographic Data
  2. Growth Rates for Castlewood (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. South Dakota Research Tools (Easy Tools & Current Data)
  3. South Dakota Data Comparison Tool - 2025 Demographics
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Castlewood, SD Data & Demographics (As of July 1, 2025)

POPULATION

Total Population 835 (100%)
Population in Households 835 (100.0%)
Population in Families 701 (84.0%)
Population in Group Quarters1 0
Population Density 726
Diversity Index2 22
 
 

INCOME

Median Household Income $86,637
Average Household Income $101,587
% of Income for Mortgage4 19%
Per Capita Income $37,228
Wealth Index5 84
Socioeconomic Status Index6 High (66.3)
 

HOUSING

Total HU (Housing Units) 332 (100%)
Owner Occupied HU 250 (75.3%)
Renter Occupied HU 56 (16.9%)
Vacant Housing Units 26 ( 7.8%)
Median Home Value $255,435
Average Home Value $317,590
Housing Affordability Index3 120
 

HOUSEHOLDS

Total Households 306
Average Household Size 2.73
Family Households 201
Average Family Size 3.00
NOTES
  1. 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.
  2. 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.
  3. 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.
  4. 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).
  5. 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.
  6. 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.

GROWTH RATE / YEAR

 2020-2025 2025-2030
Population 3.47% 1.35%
Households 2.41% 1.15%
Families   2.28%
Median Household Income   0.76%
Per Capita Income   1.34%
Owner Occupied HU   0.94%

Castlewood, SD - Peer Comparisons by Rank and Percentile

The table below compares Castlewood 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.

Variable Description Rank Percentile
Total Population # 95 81st
Population Density # 135 72nd
Median Household Income # 119 76th
Housing Affordability Index # 372 77th
Per Capita Income # 250 49th
Diversity Index # 216 55th

Additional comparisons and rankings can be made with a VERY EASY TO USE South Dakota Census Data Comparison Tool.

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