Zip Code 51640 — Hamburg, IA
51640 is a ZIP Code associated with Hamburg, IA, located within Fremont. 51640 ranks #3 out of 9 ZIP codes in Fremont County by population (and #373 out of 970 in IA). The area supports an estimated population of 1,381 residents across Data Pending housing units, with a population density of 4.6 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (40.622620, -95.663400)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 51640 |
| Primary City | Hamburg |
| State / Province | IA |
| County | Fremont |
| Total Population | 1,381 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 4.6 people/sq mi |
| Timezone | America/Chicago |
How 51640 Compares
| Metric | ZIP 51640 | Fremont County | IA State Average |
|---|
| Population | 1,381 | 6,859 (Total) | 3,210,984 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 4.6 /sq mi | -- | -- |
| County Pop Rank | #3 of 9 | -- | -- |
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 →