Residential delivery area · South Dakota
ZIP Code 57223: Castlewood, SD
ZIP code 57223 uses the postal name Castlewood, South Dakota and lies mostly in Hamlin County (98% of its land) with the rest in Deuel County (Census 2020 ZIP-county file). About 1,400 people live there (Census Bureau, ACS 2020-2024). Median household income is $92,424 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Castlewood (under 1%), Claremont Colony (under 1%) and Poinsett Colony (under 1%); 98% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2023
- ZBP2023
- IRS2022
- Town
- Castlewood · its only residential ZIP
- County
- Hamlin County (98%); Deuel County (2%)
- Census places
- Castlewood (under 1%); Claremont Colony (under 1%) census-designated place; Poinsett Colony (under 1%) census-designated place
- House district
- SD at large 119th Congress
- State
- South Dakota
- Time zone
- Central
- Land area
- 124.6 sq mi · 11 people per sq mi
Where is ZIP code 57223?
57223 centers on 44.712°, -96.994° and covers 124.6 square miles of land plus 3.2 of water. It borders 6 ZIP codes: 57234, 57241, 57238, 57248, 57226, 57201.
The map draws ZIP code areas only. For the streets inside 57223, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 57223 compare with the rest of Hamlin County?
| Measure | 57223 | In Hamlin County | In SD |
|---|---|---|---|
| People (ACS 2020-2024) | 1,429 | 2nd of 10 | 100th of 375 |
| Median household income | $92k | 2nd of 5 | 23rd of 107 |
| Median home value | $237k | 2nd of 5 | 51st of 109 |
Its median household income is higher than in 75% of U.S. residential ZIP codes, and it is denser than 18% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 57223?
The 2020 Census counted 1,437 people in 57223; the ACS, which samples households over 2020-2024, estimates 1,429. Between the 2010 and 2020 censuses its population grew 6.0% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 1,429±158 (90% margin)
- 2020 Census count
- 1,437+6.0% since 2010 (1,356)
- Households
- 510
- Median age
- 34.3
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 57223?
Of the 1,429 people the ACS estimates in 57223, 34.7% are under 18 and 13.0% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (94.3%).
- Under 1834.7%
- 18 to 6452.3%
- 65 and older13.0%
- White, not Hispanic94.3%
- Other or two or more4.5%
- Asian, not Hispanic0.6%
- Black, not Hispanic0.3%
- Hispanic or Latino0.3%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 57223 earn?
Median household income is $92,424 (ACS 2020-2024), the 2nd highest of the 5 ranked ZIP codes in Hamlin County. It rose from $86,483 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.
- Median household income
- $92,424
- Income per person
- $39,865
- Below the poverty line
- 3.4%
- Unemployed (of the labor force)
- 1.0%
- Adults 25+ with a bachelor's degree
- 28.5%
- Adjusted gross income per tax return, 2022
- $81,214700 returns; wages 57% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 57223?
- Median home value (owners' estimate)
- $236,600
- Median gross rent
- $1,133
- Homes owned by their occupants
- 87.6%
- Housing units
- 575
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 57223?
43 business establishments had a location in this ZIP code in 2023, 6 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction14
- Retail trade6
- Finance and insurance5
- Administrative and support and waste management and remediation services4
- Professional, scientific, and technical services3
- Other services (except public administration)3
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 57223?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 57234 | Estelline | 1,339 | $82k | 8.6 mi |
| 57241 | Hayti | 936 | $86k | 11.0 mi |
| 57238 | Goodwin | 315 | $66k | 12.9 mi |
| 57248 | Lake Norden | 1,295 | $96k | 13.0 mi |
| 57226 | Clear Lake | 1,953 | $83k | 14.0 mi |
| 57201 | Watertown | 26,781 | $73k | 16.2 mi |
| 57245 | Kranzburg | 151 | $86k | 13.1 mi (near) |
| 57220 | Bruce | 665 | $86k | 17.9 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.