Duncan, IA ZIP Codes
2 ZIP codes serve Duncan, Iowa: 50438 and 50423. Together they are home to 6,286 residents in 2,878 households. That is more than the 21 people counted inside Duncan Census-designated place, because these ZIP codes reach past its boundary. Median household income ranges from $70,350 in 50438 to $73,151 in 50423.
Duncan Census-designated place
| Measure | Census figure |
|---|---|
| Residents | 21 |
| Households | 5 |
| Median household income | not published |
| Median home value | not published |
| Median age | 55.3 |
| Median rent | not published |
All 2 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 6,286 |
| Households (sum of ZIP codes) | 2,878 |
| Median household income, range across ZIP codes | $70,350 (50438) to $73,151 (50423) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $71,371 |
| Homeowners | 80.8% |
| Households with kids under 18 | 26.6% |
| Moved in the past year | 9.5% |
| Carrier routes in EDDM2GO's route library | 6 routes, 1,699 homes (1 of 2 ZIP codes) |
Top facts
- Highest median household income in Duncan: 50423 ($73,151)
- Most residents: 50438 (3,995 people)
- Highest homeownership: 50438 (81.4% own their home)
- Most households with kids: 50438 (27.2% of households)
- Most new movers: 50423 (11.2% moved in last year)
- Youngest median age: 50438 (48.9 years)
- Highest median home value: 50438 ($197,600)
Every ZIP code in Duncan
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 50438 | Garner | 3,995 | 1,829 | $70,350 | $197,600 | 81.4% | 27.2% | 8.6% | 6 | 1,788 | 0% of its land |
| 50423 | Britt | 2,291 | 1,049 | $73,151 | $118,900 | 79.8% | 25.6% | 11.2% | — | — | 0% of its land |
A ZIP code is listed for Duncan when at least 10% of its land lies inside the Duncan Census-designated place, when it holds at least 10% of the place's land, or when its USPS mailing city is Duncan. The table shows which applies. Totals add up whole ZIP codes, so they include any parts outside Duncan.
Counties
- Hancock County — 12 ZIP codes
Price a mailing to Duncan ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Duncan, IA?
- 50438 and 50423. A ZIP code is listed for Duncan when at least 10% of its land lies inside the Duncan Census-designated place, when it holds at least 10% of the place's land, or when its USPS mailing city is Duncan.
- What is the population of Duncan, IA?
- The Census Bureau counts 21 residents inside Duncan Census-designated place (ACS 2020–2024). The 2 ZIP codes that serve Duncan hold 6,286 residents in all.
- What is the median household income in Duncan, IA?
- Across its ZIP codes the medians run from $70,350 to $73,151.
- Which Duncan ZIP code has the highest median household income?
- 50423, at $73,151, among ZIP codes with at least 1,000 residents.
- How many carrier routes and mailboxes are in Duncan, IA?
- For the 1 of 2 ZIP codes in EDDM2GO's stored route library: 6 carrier routes reaching 1,699 residential and 88 business mailboxes. The route map loads the rest when you search them.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.