Residential delivery area · Ohio
ZIP Code 45342: Miamisburg, OH
ZIP code 45342 uses the postal name Miamisburg, Ohio and lies mostly in Montgomery County (98% of its land) with the rest in Warren County (Census 2020 ZIP-county file). About 36,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $84,907 (Census Bureau, ACS 2020-2024). By Census place, 35% of its land lies in Miamisburg, and 13% in smaller places; 53% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Miamisburg · its only residential ZIP
- County
- Montgomery County (98%); Warren County (2%)
- Census places
- Miamisburg
- Metro area
- Dayton-Kettering-Beavercreek, OH
- House districts
- OH-10 (98%), OH-1 (2%) 119th Congress, by share of land
- State
- Ohio
- Time zone
- Eastern
- Land area
- 34.3 sq mi · 1,054 people per sq mi
- PO Box ZIPs
- 45343 also use the name Miamisburg
Where is ZIP code 45342?
45342 centers on 39.629°, -84.276° and covers 34.3 square miles of land plus 0.4 of water. It borders 8 ZIP codes: 45449, 45439, 45459, 45066, 45458, 45327, 45005, 45417.
The map draws ZIP code areas only. For the streets inside 45342, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 45342 compare with the rest of Montgomery County?
| Measure | 45342 | In Montgomery County | In OH |
|---|---|---|---|
| People (ACS 2020-2024) | 36,152 | 3rd of 39 | 69th of 1,233 |
| Median household income | $85k | 9th of 34 | 197th of 755 |
| Median home value | $230k | 10th of 34 | 275th of 810 |
Its median household income is higher than in 68% of U.S. residential ZIP codes, and it is denser than 79% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 45342?
The 2020 Census counted 37,508 people in 45342; the ACS, which samples households over 2020-2024, estimates 36,152. Between the 2010 and 2020 censuses its population grew 2.0% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 36,152
- 2020 Census count
- 37,508+2.0% since 2010 (36,784)
- Households
- 15,157
- Median age
- 38.3
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 45342?
Of the 36,152 people the ACS estimates in 45342, 23.3% are under 18 and 15.8% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (82.3%).
- Under 1823.3%
- 18 to 6461.0%
- 65 and older15.8%
- White, not Hispanic82.3%
- Other or two or more5.7%
- Black, not Hispanic5.1%
- Asian, not Hispanic4.3%
- Hispanic or Latino2.6%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 45342 earn?
Median household income is $84,907 (ACS 2020-2024), the 9th highest of the 34 ranked ZIP codes in Montgomery County. It rose from $77,091 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.
- Median household income
- $84,907
- Income per person
- $42,931
- Below the poverty line
- 9.0%
- Unemployed (of the labor force)
- 4.3%
- Adults 25+ with a bachelor's degree
- 33.3%
- Adjusted gross income per tax return, 2022
- $68,58018,560 returns; wages 75% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 45342?
FHFA's house price index for 45342, built from repeat sales and appraisals of the same homes, rose 105% from 2015 to 2025 and rose 56% from 2020 to 2025, and moved +8.5% in 2025.
- Median home value (owners' estimate)
- $230,300
- Median gross rent
- $1,312
- Homes owned by their occupants
- 65.1%
- Housing units
- 15,927
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 45342?
798 business establishments had a location in this ZIP code in 2023, 41 more than in 2018; the most are in retail trade (ZIP Code Business Patterns).
- Retail trade107
- Professional, scientific, and technical services85
- Accommodation and food services84
- Health care and social assistance78
- Other services (except public administration)67
- Manufacturing59
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 45342?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 45449 | Dayton | 19,066 | $64k | 3.1 mi |
| 45439 | Dayton | 11,914 | $52k | 5.4 mi |
| 45459 | Dayton | 28,553 | $90k | 5.9 mi |
| 45066 | Springboro | 27,545 | $131k | 6.4 mi |
| 45458 | Dayton | 38,712 | $110k | 6.6 mi |
| 45327 | Germantown | 9,315 | $95k | 6.8 mi |
| 45005 | Franklin | 32,251 | $75k | 7.0 mi |
| 45417 | Dayton | 28,186 | $37k | 7.2 mi |
| 45429 | Dayton | 26,347 | $80k | 7.1 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.
Which other ZIP codes use the name Miamisburg?
1 more ZIP code carries the postal name Miamisburg, OH without a residential delivery area: PO boxes at the post office, or a single organization with its own ZIP code. The Census Bureau publishes no figures for it.
| ZIP | County |
|---|---|
| 45343 | Montgomery County |
Source: GeoNames postal codes (CC BY 4.0), downloaded 2026-10-09; a ZIP code with no Census ZCTA has no residential delivery area.