| City: | Calumet, Iowa |
| County: | Obrien County |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 7:52:21 PM |
| Population: | 146 [See All] |
| Area Code: | 712 |
| Classification: | PO Box |
| Coordinates: | 42.9609, -95.5641 |
| Land Area: | 0.266 sq mi |
| Quick Link: |
Calumet is a small farming community in northwest Iowa's O'Brien County with a population of 146 residents. This is a PO Box Only Zone, meaning there's no alternative mail delivery across the town's compact 0.28 square mile territory. The Calumet post office maintains 68 PO Boxes for 73 households, resulting in a 93% adoption rate that reflects the lack of standard street delivery options.
Despite its PO Box classification, Calumet does have one rural carrier route serving the surrounding agricultural area. The town's street grid includes numbered streets (1st through 3rd) and named avenues (Morse, Railway, Bunce), a layout typical of small Iowa railroad towns. The presence of Railway Avenue hints at the town's origins along a rail line, common in Iowa communities established during westward expansion.
Demographics show a median age of 40.5 years with 146 residents living in 73 occupied homes. The population is 94% white with 12% Hispanic. Home ownership is strong at 78% (57 of 73 homes are owner-occupied). Median household income stands at $53,125, close to the national median, with a median home value of $65,000. About 23% of workers work from home, likely farmers and remote workers.
Calumet supports 6 small businesses employing 23 people total. With 40 workers in transportation, warehousing, and utilities (representing a significant share of the small workforce), the town's economy maintains ties to agricultural logistics and rural infrastructure. This is working farmland where mail delivery by PO Box serves both town residents and the surrounding rural territory.
All mail to Calumet addresses should include a PO Box number. The mailing format is:
PO Box [Number]
Calumet, IA 51009Street addresses are not valid for mail delivery in this PO Box Only Zone.
Street names follow a classic Iowa railroad town pattern with numbered streets and Railway Avenue indicating the town's transportation heritage.
ZIP Code 51009 has 146 residents and 73 households (average 2.00 persons per household). The median age is 40.5 years, slightly older than the state (38.6) and slightly older than the nation (38.8). The gender split is 55.5% male and 44.5% female, which is higher than the national male share (49.1%), making this a male-majority area. Largest groups are White (93.8%, much higher than the state average of 84.5% and well above the national average of 61.6%) and Black or African American (2.1%, much lower than the national average of 12.4%); Hispanic or Latino residents make up 2.1%, which is much lower than the national average (18.7%).
Explore More:Population Over TimeBy Age & GenderBy RaceBy GenderNativity & Citizenship
| 2020 Population: | 146Source: Census DHC |
| 2024 ACS Population Estimate: | 131Source: Census ACS |
| 2026 ZC Population Estimate: | 0Source: ZIP-Codes.com |
| Population Density: | 548.9 people per sq mile |
| Average Income: | $53,125Source: Census ACS |
| Households: | 73Source: Census DHC |
| Average House Value: | $65,000Source: Census ACS |
| Persons Per Household: | 2.00Source: Census DHC |
| Average Family Size: | 2.76Source: Census ACS |
| Group | 2010 | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Census ACS Population Estimate | -- | 284 | 309 | 281 | 304 | 202 | 187 | 164 | 154 | 246 | 147 | 175 | 166 | 131 |
| Decennial Census | 164 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 146 | -- | -- | -- |
Median Age: 40.5
Male Median Age: 39.5
Female Median Age: 43.3
| Group | < 5 | 5-9 | 10-14 | 15-19 | 20-24 | 25-29 | 30-34 | 35-39 | 40-44 | 45-49 | 50-54 | 55-59 | 60-64 | 65-69 | 70-74 | 75-79 | 80-84 | 85+ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Male | 5 | 2 | 10 | 5 | 3 | 5 | 4 | 8 | 9 | 3 | 0 | 8 | 5 | 3 | 5 | 4 | 0 | 2 |
| Female | 4 | 5 | 5 | 6 | 1 | 4 | 2 | 4 | 3 | 3 | 2 | 5 | 7 | 3 | 3 | 6 | 0 | 2 |
| Total | 9 | 7 | 15 | 11 | 4 | 9 | 6 | 12 | 12 | 6 | 2 | 13 | 12 | 6 | 8 | 10 | 0 | 4 |
| White: | 137 | 95.14% |
| Black: | 3 | 2.08% |
| Hispanic:* | 3 | 2.08% |
| Asian: | 0 | 0% |
| American Indian: | 0 | 0% |
| Hawaiian: | 0 | 0% |
| Other: | 1 | 0.69% |
| Total: | 144 | 100% |
| Gender | Count | % | Median Age |
|---|---|---|---|
| Males: | 81 | 55.48% | 39.5 years |
| Females: | 65 | 44.52% | 43.3 years |
| Total: | 146 | 100% | 40.5 years |
| Native, born in the United States: | 129 | 98.47% |
| Native, born in PR, Island Areas, or abroad: | 0 | 0.00% |
| Foreign born, naturalized U.S. citizen: | 0 | 0.00% |
| Foreign born, not a U.S. citizen: | 2 | 1.53% |
| Total Population: | 131 | 100% |
| Total Native Population: | 129 | 98.47% |
| Total Foreign-born Population: | 2 | 1.53% |
In 2023, the Median household income is $53,125, which is well under the national median ($78,538), is down $903 (1.7%) since 2011 and above its 2019 pre-pandemic level by $9,875. Family households earn a median of $76,875 versus $28,750 for nonfamily households (a difference of $48,125). By gender, male median income is $57,500 and female is $41,875, which is much lower than the national female median ($53,445), with a current gap of $15,625 that has widened from 2011 to 2023. The labor-force participation rate is 58.1%, which is markedly below the state rate (66.5%). The unemployment rate is 4.0%, which is generally lower than the national rate (5.2%). The largest occupation group is Management (33.3%).
Explore More:Income Over TimeHousehold IncomeEmployment StatusBy Occupation
| Income Type | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Household Income | $54,028 | $56,827 | $55,500 | $52,361 | $59,063 | $49,375 | $46,250 | $42,143 | $43,250 | $40,417 | $48,125 | $52,917 | $53,125 |
| Median Family Income | $39,438 | $42,500 | $58,750 | $56,250 | $58,125 | $42,813 | $43,750 | $42,321 | $44,500 | $44,063 | $76,250 | $73,125 | $76,875 |
| Median NonFamily Income | $33,750 | $47,708 | $48,750 | $51,719 | $55,000 | $60,000 | $47,083 | $39,375 | $0 | $25,833 | $27,500 | $28,438 | $28,750 |
| Median Male Income | $36,667 | $37,083 | $43,214 | $43,250 | $0 | $43,750 | $46,964 | $49,167 | $60,833 | $46,250 | $51,250 | $58,750 | $57,500 |
| Median Female Income | $28,125 | $30,625 | $26,719 | $26,736 | $0 | $25,417 | $26,667 | $30,000 | $24,712 | $28,750 | $31,250 | $46,250 | $41,875 |
| Employed: | 48 | 55.81% |
| Unemployed: | 2 | 2.33% |
| Not In Labor Force: | 36 | 41.86% |
| Total: | 86 | 100% |
| Management, business, science, and arts: | 16 | 33.33% |
| Service: | 10 | 20.83% |
| Sales and Office: | 5 | 10.42% |
| Natural resources, construction, and maintenance: | 3 | 6.25% |
| Production, transportation, and material moving: | 14 | 29.17% |
| Total Civilian Employed Population: | 48 | 100% |
In 2023, the median home value is $65,000, which is well under the national median ($303,400), is up $6,700 (11.49%) since 2011 and above its 2019 pre-pandemic level by $1,200. The median gross rent is $475, which is well under the national median ($1,348), is down $150 (24.00%) since 2011 and above its 2019 pre-pandemic level by $29. Of occupied housing, owners make up 83.64% (26.09% with a mortgage, 73.91% free-and-clear) and renters 16.36% - making this ZIP Code more home ownership than the state and under national rental averages. Insufficient data for vacancy rate.
Explore More:Compare Home ValueHome Value Over TimeRent & Over TimeHousing Occupancy
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Home Value | $58,300 | $49,600 | $48,200 | $46,300 | $47,900 | $53,100 | $54,500 | $55,500 | $63,800 | $71,500 | $62,500 | $70,800 | $65,000 |
| Less than $500: | 6 | 66.67% |
| $500 to $999: | 2 | 22.22% |
| $1,000 to $1,499: | 0 | 0.00% |
| $1,500 to $1,999: | 0 | 0.00% |
| $2,000 to $2,499: | 0 | 0.00% |
| $2,500 to $2,999: | 0 | 0.00% |
| $3,000 or more: | 0 | 0.00% |
| No Rent: | 1 | 11.11% |
| Total: | 9 | 100% |
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Rent | $625 | $708 | $592 | $719 | $525 | $0 | $488 | $475 | $446 | $450 | $434 | $525 | $475 |
| Owner Occupied (with mortgage): | 12 | 21.82% |
| Owner Occupied (free and clear, no mortgage): | 34 | 61.82% |
| Renter Occupied: | 9 | 16.36% |
| Total Occupied Housing Units: | 55 | 100% |
| Occupied Housing Units: | 55 | 94.83% |
| Vacant Housing Units (not graphed): | 3 | 5.17% |
| Total Housing Units: | 58 | 100% |
| Single-Family Units: | 58 | 100.00% |
| Multi-Family Units: | 0 | 0.00% |
| Other Units: | 0 | 0.00% |
| Total Housing Units: | 58 | 100% |
In 2023, 17.30% of adults (25+) have a bachelor's degree or higher, which is far lower than the national rate (35.00%). High school or higher is 96.30%, which is far higher than the national rate (89.40%). The uninsured rate is 0.80%, which is far lower than the national rate (8.60%). The share of people in poverty is 19.40%, which is on par with the state rate (6.90%), up 10.90 percentage points since 2011 and below its 2019 pre-pandemic level by 14.50 percentage points. This signals a sharp increase in hardship - a shrinking consumer base, heavy pressure on public services, and job-market contraction risks. Among residents ages 3+, the largest enrollment group is elementary (62.86%). College enrollment is 17.14%, which is comparable to the national rate (26.70%), meaning the community mirrors broader higher-education participation.
Explore More:Educational AttainmentHealth InsurancePoverty Over TimeSchool Enrollment
| Less than 9th grade: | 0 | 0.00% |
| 9th to 12th grade, no diploma: | 3 | 3.70% |
| High school graduate (includes equivalency): | 45 | 55.56% |
| Some college, no degree: | 9 | 11.11% |
| Associate's degree: | 10 | 12.35% |
| Bachelor's degree: | 12 | 14.81% |
| Graduate or professional degree: | 2 | 2.47% |
| Total: | 81 | 100% |
| High school or higher: | 78 | 96.30% |
| Bachelor's degree or higher: | 14 | 17.28% |
| Private Insurance: | 76 | 51.35% |
| Public Insurance: | 71 | 47.97% |
| No Insurance: | 1 | 0.68% |
| Total: | 148 | 100% |
| Has Health Insurance: | 147 | 99.32% |
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| % of People in Poverty | 8.5% | 9.1% | 8.1% | 12.1% | 5.9% | 9.8% | 7.5% | 17.1% | 33.9% | 28.6% | 28.6% | 18.9% | 19.4% |
Note: Counts of Families & People in poverty are not published at the ZIP Code level due to small sample sizes. Percentages shown are survey estimates from the American Community Survey (ACS). They may differ from official poverty statistics. The U.S. Census Bureau defines poverty status by comparing a family's or individual's total income with federal poverty thresholds that vary by family size and composition.
| Nursery School, Preschool: | 1 | 2.86% |
| Kindergarten: | 0 | 0.00% |
| Elementary school (grades 1-8): | 22 | 62.86% |
| High school (grades 9-12): | 6 | 17.14% |
| College or graduate school: | 6 | 17.14% |
| Total: | 35 | 100% |
| Early Childhood: | 1 | 2.86% |
| K-12 (Primary & Secondary School): | 28 | 80.00% |
ZIP Code 51009 supports both business and residential activity. According to the Business Census (2024), there are 5 business establishments, employing about 28 people with an annual payroll of $2,082,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 78Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 5Source: CBP |
| 1st Quarter Payroll: | $414,000Source: CBP |
| Annual Payroll: | $2,082,000Source: CBP |
| # of Employees: | 28Source: CBP |
ZIP Code 51009 is located in Obrien County, Iowa, within the Metropolitan Statistical Area (CBSA ) and Iowa's 4th Congressional District. This area has a population of 0 people, about 0.00% of whom live in ZIP Code 51009. It covers 0.266 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | --Source: Census |
| CBSA Number: | --Source: Census |
| CBSA Type: | --Source: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 0Source: Census |
| MSA: | Source: Census |
| Land Area: | 0.266 sq miSource: Census |
| Water Area: | --Source: Census |
| Congressional District: | 04Source: USPS |
| Congressional Land Area: | 22756.75 sq miSource: Census |
| PMSA: | Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 1910090Source: Census |
| Place Name: | Calumet city; IowaSource: Census |
We could not locate which school district 51009 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on January 1, 2026.