PlainZIP

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
$60,000
Median income
24.3%
Bachelor's or higher

The verdict

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 Idaho average), while per-capita income is $26,022. Poverty here runs at 14.8%, with unemployment measured at 5.7%. Housing costs here run - for a typical home value, with rent averaging $925 a month; 66.7% of homes are owner-occupied.

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 -. To put 83321 in local context, 1 ZIP codes within roughly 10 miles appear further down this page alongside 6 additional ZIPs in Twin Falls County, for a geography-aware comparison.

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

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 83321?

46.8

Median Age

59.3%

Male

40.7%

Female

12.7%

Foreign-Born

White 69.7%
African American 0.0%
Asian 0.0%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 17.4%
Hispanic or Latino 36.7%

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

$26,022

Per Capita Income

14.8%

Poverty Rate

5.7%

Unemployment Rate

How ZIP 83321 ranks nationally

Castleford, ID household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$60,000 29th percentile higher than 29% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). Below this entry. $60,000–$80,000: 9,980 US ZIPs (33%). This entry sits in this band. $80,000–$100,000: 5,778 US ZIPs (19%). Above this entry. $100,000–$120,000: 2,855 US ZIPs (9%). Above this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Above this entry. $140,000–$160,000: 686 US ZIPs (2%). Above this entry. $160,000–$180,000: 364 US ZIPs (1%). Above this entry. $180,000–$200,000: 186 US ZIPs (1%). Above this entry. $200,000–$220,000: 324 US ZIPs (1%). Above this entry. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US 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?

High School Graduate or Higher 46.6%
Bachelor's Degree or Higher 24.3%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

231

Total Housing Units

210

Occupied Units

21

Vacant Units

2.30

Avg Household Size

Occupancy Type

Owner 66.7%
Renter 33.3%

$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

More ZIP Codes in Twin Falls County

83301 standard
Twin Falls, ID
Pop: 52,010
83316 standard
Buhl, ID
Pop: 9,626
83341 standard
Kimberly, ID
Pop: 6,491
83328 standard
Filer, ID
Pop: 5,347
83334 standard
Hansen, ID
Pop: 2,060
83344 standard
Murtaugh, ID
Pop: 1,128

Related Areas

Twin Falls County Castleford, ID Idaho

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.

Read our methodology to see how this data is sourced, computed, and verified.