Zip Code 50565 — Marathon, IA
50565 is a ZIP Code associated with Marathon, IA, located within Buena Vista. 50565 ranks #6 out of 8 ZIP codes in Buena Vista County by population (and #744 out of 970 in IA). The area supports an estimated population of 380 residents across Data Pending housing units, with a population density of 3.4 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (42.861180, -94.996980)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 50565 |
| Primary City | Marathon |
| State / Province | IA |
| County | Buena Vista |
| Total Population | 380 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 3.4 people/sq mi |
| Timezone | America/Chicago |
How 50565 Compares
| Metric | ZIP 50565 | Buena Vista County | IA State Average |
|---|
| Population | 380 | 20,568 (Total) | 3,210,984 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 3.4 /sq mi | -- | -- |
| County Pop Rank | #6 of 8 | -- | -- |
Nearby ZIP Codes
Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →