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Zip Code 45312 — Casstown, OH

45312 is a ZIP Code associated with Casstown, OH, located within Miami. 45312 ranks #9 out of 11 ZIP codes in Miami County by population (and #914 out of 1,232 in OH). The area supports an estimated population of 1,086 residents across Data Pending housing units, with a population density of 15.3 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (40.060280, -84.079760)

Data MetricLocal Statistic
Postal / Zip Code45312
Primary CityCasstown
State / ProvinceOH
CountyMiami
Total Population1,086
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density15.3 people/sq mi
TimezoneAmerica/New_York

How 45312 Compares

MetricZIP 45312Miami CountyOH State Average
Population1,086105,795 (Total)11,810,293 (Total)
Average ZIP IncomeData PendingN/AN/A
Population Density15.3 /sq mi----
County Pop Rank#9 of 11----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 45389Christiansburg2.9 mi708N/A
Zip 45326Fletcher5.7 mi1,446N/A
Zip 45373Troy6.4 mi37,565N/A
Zip 43072Saint Paris7.7 mi5,253N/A
Zip 45344New Carlisle8.2 mi16,979N/A

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 →