Zip Code 64780 — Rockville, MO
64780 is a ZIP Code associated with Rockville, MO, located within St. Clair. 64780 ranks #5 out of 6 ZIP codes in St. Clair County by population (and #835 out of 1,035 in MO). The area supports an estimated population of 364 residents across Data Pending housing units, with a population density of 1.5 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (38.062460, -94.042760)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 64780 |
| Primary City | Rockville |
| State / Province | MO |
| County | St. Clair |
| Total Population | 364 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 1.5 people/sq mi |
| Timezone | America/Chicago |
How 64780 Compares
| Metric | ZIP 64780 | St. Clair County | MO State Average |
|---|
| Population | 364 | 8,861 (Total) | 6,191,989 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 1.5 /sq mi | -- | -- |
| County Pop Rank | #5 of 6 | -- | -- |
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 →