Castleford, ID · standard
ZIP Code 83321
Twin Falls County, Idaho - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.
- 550
- 2/sq mi Low-density area
- $60,000
- Median income Below-median income area
- 24.3%
- Bachelor's or higher Near-average bachelor's attainment
National ZIP placement
Castleford pairs a below-median household income, in a rural, homeowner-dominated area.
- 29th pct
- household income, US ZIPs
- 2
- people per sq mi
- 67%
- owner-occupied homes
Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 83321 against every reporting US ZIP.
ZIP code 83321 is a sparsely populated ZIP (a standard USPS delivery area) in Castleford, Twin Falls County, Idaho, home to just 550 residents across 229.2 square miles, a density of 2 people per square mile, in the Boise time zone.
ZIP 83321 reports a modest median household income of $60,000 (18% below the average Idaho ZIP), while per-capita income is $26,022. The poverty rate is 14.8%, with unemployment at 5.7%; those measures add context to the income figure. The ACS does not report a median home value for this ZIP, so housing cost context is limited to the available tenure and rent fields.
Educational attainment sits below the national norm: 24.3% of adults hold a bachelor's degree or higher, the median age is 46.8, and the average commute is -. The page also surfaces 1 ZIP codes within roughly 10 miles and 6 more in Twin Falls County, so 83321 can be compared with both its immediate and county-level context.
Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →
Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 83321, Castleford, ID · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.
Quick Facts
550
Population
229.2
Area (sq mi)
2
People / sq mi
Boise
Time Zone
standard
ZIP Type
Who lives in ZIP 83321?
46.8
Median Age
59.3%
Male
40.7%
Female
12.7%
Foreign-Born
Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
How much do residents earn?
$60,000
Median Household Income
-18% vs state ZIP avg
$26,022
Per Capita Income
14.8%
Poverty Rate
5.7%
Unemployment Rate
How ZIP 83321 ranks among Idaho ZIPs
Castleford, ID household income vs. every Idaho ZIP code
Median household income among 250 reporting Idaho ZIPs (this ZIP's population is too small for a reliable national-corpus placement)
$60,000 22nd percentile higher than 22% of 250 Idaho ZIPs
Each bar is a $20K-wide band; taller bars hold more Idaho ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What is the education profile here?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
231housing units
231
Total Housing Units
210
Occupied Units
21
Vacant Units
2.30
Avg Household Size
Occupancy Type
$925
Median Rent
1980
Median Year Built
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What businesses operate in this ZIP?
Census Bureau data shows 11 business establishments in ZIP 83321, employing approximately 61 people with a combined annual payroll of $2,462,000.
11
Businesses
61
Employees
$2.5M
Annual Payroll
1
Industry Sectors
| Industry | Establishments | % of Total |
|---|---|---|
| Transportation and warehousing | 3 | 27.3% |
Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.
Nearby ZIP Codes
Want a side-by-side? Compare 83321 vs 83316 →
| ZIP Code | City | Population | Distance |
|---|---|---|---|
| 83316 | Buhl, ID | 9,626 | 10.5 mi |
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 83321, both outside ID so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in Twin Falls County
Related Areas
Frequently Asked Questions
What county is ZIP code 83321 in?
ZIP code 83321 (Castleford) is located in Twin Falls County, Idaho. Twin Falls County contains multiple ZIP codes, see the full list at /counties/twin-falls-id.
What is the population of ZIP code 83321?
ZIP code 83321 in Castleford, ID has a population of 550 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 83321?
The median household income in ZIP 83321 is $60,000, which is 21% below the national average of $76,288.
What is the demographic makeup of ZIP 83321?
The largest racial group in ZIP 83321 is White at 69.7%. Hispanic or Latino residents make up 36.7% of the population.
How many businesses are in ZIP code 83321?
ZIP code 83321 has 11 business establishments employing approximately 61 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What is the education level in ZIP code 83321?
In ZIP code 83321, 46.6% of residents aged 25+ have a high school diploma or higher, and 24.3% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What percentage of residents own vs. rent in ZIP 83321?
In ZIP code 83321, approximately 66.7% of occupied housing units are owner-occupied and 33.3% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 83321?
The poverty rate in ZIP code 83321 is 14.8% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.
Related
Take this with you
What to do with ZIP 83321's numbers, next.
- See how ZIP 83321 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Castleford, ID ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
- Save this ZIP to your shortlist to track alongside others you're considering View your shortlist
ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.