Red Oak, IA · standard
ZIP Code 51566
Montgomery County, Iowa - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.
- 7,035
- 15/sq mi Moderate-density area
- $56,637
- Median income Below-median income area
- $134,200
- Median home value Below-median home value
- 20.9%
- Bachelor's or higher Near-average bachelor's attainment
National ZIP placement
Red Oak pairs one of the lowest household incomes in the country with among the most affordable home values nationally, in a rural, homeowner-dominated area.
- 23rd pct
- household income, US ZIPs
- 21st pct
- home value, US ZIPs
- 15
- people per sq mi
- 64%
- owner-occupied homes
Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 51566 against every reporting US ZIP.
FHFA HPI release change
What changed in the latest House Price Index year
- FHFA House Price Index values in ZIP 51566 (Red Oak, IA) rose +3.0% from 2023 to 2024. The all-transactions index moved from 183.4 in 2023 to 189.0 in 2024 (2000 = 100).
ZIP code 51566 is a mid-sized community (a standard USPS delivery area) in Red Oak, Montgomery County, Iowa, home to 7,035 residents across 456.8 square miles, a density of 15 people per square mile, in the Chicago time zone.
ZIP 51566 reports a modest median household income of $56,637 (26% below the average Iowa ZIP), while per-capita income is $37,850. The poverty rate is 17.2%, with unemployment at 3.2%; those measures add context to the income figure. Home values sit below the statewide ZIP benchmark: the median is $134,200 (24% below the average Iowa ZIP), and median rent is $829; owner occupancy is 63.7%.
Educational attainment sits below the national norm: 20.9% of adults hold a bachelor's degree or higher, the median age is 42.1, and the average commute is 20 minutes. The page also surfaces 3 ZIP codes within roughly 10 miles and 3 more in Montgomery County, so 51566 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 →
Top industries in ZIP 51566
Top 5 sectors by establishment count in Red Oak, IA
Which industries have the most business establishments in ZIP 51566.
- Retail trade
Retail trade
30 establishments
- Health care and social assistance
Health care and social assistance
28 establishments
- Construction
Construction
25 establishments
- Other services (except public administration)
Other services (except public administration)
23 establishments
- Accommodation and food services
Accommodation and food services
19 establishments
What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.
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 51566, Red Oak, IA · 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
7,035
Population
456.8
Area (sq mi)
15
People / sq mi
Chicago
Time Zone
standard
ZIP Type
Who lives in ZIP 51566?
42.1
Median Age
50.3%
Male
49.7%
Female
2.2%
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?
$56,637
Median Household Income
-26% vs state ZIP avg
$37,850
Per Capita Income
17.2%
Poverty Rate
3.2%
Unemployment Rate
20.4 min
Mean Commute Time
How ZIP 51566 ranks among Iowa ZIPs
Red Oak, IA household income vs. every Iowa ZIP code
Median household income among 911 reporting Iowa ZIPs (this ZIP's population is too small for a reliable national-corpus placement)
$56,637 12th percentile higher than 12% of 911 Iowa ZIPs
Each bar is a $20K-wide band; taller bars hold more Iowa 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
3,432housing units
3,432
Total Housing Units
3,128
Occupied Units
304
Vacant Units
2.20
Avg Household Size
Occupancy Type
$134,200
Median Home Value
-24% vs state ZIP avg
$829
Median Rent
1962
Median Year Built
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
How have home values changed over time?
FHFA House Price Index, annual appreciation data based on repeat sales and appraisals
+3.0%
YoY Change (2024)
189
HPI Index (2000 = 100)
+89%
Total Change Since 2000
Home values in ZIP 51566 have increased 3.0% over the past year (2024). Since 2000, this ZIP has seen +89% cumulative appreciation.
| Year | Annual Change | HPI Index |
|---|---|---|
| 2020 | -1.0% | 129 |
| 2021 | +12.1% | 145 |
| 2022 | +14.7% | 166 |
| 2023 | +10.3% | 183 |
| 2024 | +3.0% | 189 |
Source: Federal Housing Finance Agency (FHFA) House Price Index, All-Transactions, Five-Digit ZIP Codes (Developmental Index). Index base = 100 in year 2000. Data through 2024. ZIP codes with few transactions may show missing values.
What businesses operate in this ZIP?
Census Bureau data shows 207 business establishments in ZIP 51566, employing approximately 2,900 people with a combined annual payroll of $138,717,000.
207
Businesses
2,900
Employees
$138.7M
Annual Payroll
14
Industry Sectors
| Industry | Establishments | % of Total |
|---|---|---|
| Retail trade | 30 | 14.5% |
| Health care and social assistance | 28 | 13.5% |
| Construction | 25 | 12.1% |
| Other services (except public administration) | 23 | 11.1% |
| Accommodation and food services | 19 | 9.2% |
| Finance and insurance | 15 | 7.3% |
| Real estate and rental and leasing | 12 | 5.8% |
| Manufacturing | 11 | 5.3% |
| Wholesale trade | 11 | 5.3% |
| Professional, scientific, and technical services | 11 | 5.3% |
| Administrative and support and waste management and remediation services | 7 | 3.4% |
| Information | 5 | 2.4% |
| Transportation and warehousing | 4 | 1.9% |
| Arts, entertainment, and recreation | 4 | 1.9% |
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 51566 vs 51533 →
ZIP 51566 vs its nearest neighbors, by population
Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 51566
Red Oak (51566)
7,035 residents
- 51573 1,093
Stanton (51573)
1,093 residents
- 51533 895
Emerson (51533)
895 residents
- 51532 622
Elliott (51532)
622 residents
What this shows Among its immediate neighbors, ZIP 51566 ranks the most populous - useful context the national average alone can't give.
ZIP 51566 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 51573
Stanton (51573)
$86,438 median income
- 51533
Emerson (51533)
$68,750 median income
- 51532
Elliott (51532)
$65,375 median income
- 51566
Red Oak (51566)
$56,637 median income
What this shows By household income, ZIP 51566 ranks #4 of 4 neighboring ZIPs, local affluence varies block to block, not just metro to metro.
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 51566, both outside IA so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar population
Nearest cross-state ZIPs by resident population (7,035 here; floor ≥1,000).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in Montgomery County
Related Areas
Frequently Asked Questions
What county is ZIP code 51566 in?
ZIP code 51566 (Red Oak) is located in Montgomery County, Iowa. Montgomery County contains multiple ZIP codes, see the full list at /counties/montgomery-ia.
What is the population of ZIP code 51566?
ZIP code 51566 in Red Oak, IA has a population of 7,035 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 51566?
The median household income in ZIP 51566 is $56,637, which is 26% below the national average of $76,288.
What is the average home value in ZIP 51566?
The median home value in ZIP 51566 is $134,200, which is 52% below the national average of $278,155.
What is the demographic makeup of ZIP 51566?
The largest racial group in ZIP 51566 is White at 90.7%. Hispanic or Latino residents make up 0.5% of the population.
How many businesses are in ZIP code 51566?
ZIP code 51566 has 207 business establishments employing approximately 2,900 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 51566?
The top industries by establishment count in ZIP 51566 are: Retail trade (30), Health care and social assistance (28), Construction (25). There are 14 industry sectors represented in total.
How have home values changed in ZIP code 51566?
According to the FHFA House Price Index, home values in ZIP 51566 increased by 3.0% in 2024. Since 2000, home values in this ZIP have appreciated by approximately 89%. This is a developmental index based on repeat sales and appraisal data from Fannie Mae and Freddie Mac.
What is the education level in ZIP code 51566?
In ZIP code 51566, 60.4% of residents aged 25+ have a high school diploma or higher, and 20.9% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What is the average commute time in ZIP 51566?
The mean commute time for workers in ZIP code 51566 is 20.4 minutes according to Census ACS data. The national average is roughly 26 minutes, so commuters here spend less time traveling to work than typical.
What percentage of residents own vs. rent in ZIP 51566?
In ZIP code 51566, approximately 63.7% of occupied housing units are owner-occupied and 36.3% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 51566?
The poverty rate in ZIP code 51566 is 17.2% 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 51566's numbers, next.
- See how ZIP 51566 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Red Oak, IA 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.