Zip Code 45040 — Mason, OH
45040 is a ZIP Code associated with Mason, OH, located within Warren. The postal region supports an estimated population of 59,518 residents across Data Pending housing units, with a population density of 807.7 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (39.350230, -84.309960)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 45040 |
| Primary City | Mason |
| State / Province | OH |
| County | Warren |
| Total Population | 59,518 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 807.7 people/sq mi |
| Timezone | America/New_York |
How 45040 Compares
| Metric | ZIP 45040 | Warren County | OH State Average |
|---|
| Population | 59,518 | 230,451 | 11,810,293 |
| Median Income | Data Pending | N/A | N/A |
| Population Density | 807.7 /sq mi | -- | -- |
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 →