Residential delivery area · Ohio
ZIP Code 45042: Middletown, OH
ZIP code 45042 uses the postal name Middletown, Ohio and lies mostly in Butler County (92% of its land) with the rest in Preble County (Census 2020 ZIP-county file). About 28,000 people live there (Census Bureau, ACS 2020-2024), the less populous of Middletown's 2 residential ZIP codes. Median household income is $69,520 (Census Bureau, ACS 2020-2024). By Census place, 17% of its land lies in Middletown; 82% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Middletown · 2 residential ZIPs
- County
- Butler County (92%); Preble County (7%)
- Census places
- Middletown
- Metro area
- Cincinnati, OH-KY-IN
- House district
- OH-8 119th Congress
- State
- Ohio
- Time zone
- Eastern
- Land area
- 49.2 sq mi · 562 people per sq mi
Where is ZIP code 45042?
45042 centers on 39.557°, -84.420° and covers 49.2 square miles of land plus 0.7 of water. It borders 7 ZIP codes: 45327, 45044, 45067, 45005, 45070, 45064, 45311.
The map draws ZIP code areas only. For the streets inside 45042, 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 45042 compare with the rest of Middletown?
| Measure | 45042 | In Middletown | In Butler County | In OH |
|---|---|---|---|---|
| People (ACS 2020-2024) | 27,652 | 2nd of 2 | 6th of 18 | 126th of 1,233 |
| Median household income | $70k | 2nd of 2 | 10th of 13 | 412th of 755 |
| Median home value | $202k | 2nd of 2 | 14th of 15 | 387th of 810 |
Its median household income is higher than in 46% of U.S. residential ZIP codes, and it is denser than 73% 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 45042?
The 2020 Census counted 26,972 people in 45042; the ACS, which samples households over 2020-2024, estimates 27,652. Between the 2010 and 2020 censuses its population grew 2.0% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 27,652
- 2020 Census count
- 26,972+2.0% since 2010 (26,451)
- Households
- 11,578
- Median age
- 41.6
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 45042?
Of the 27,652 people the ACS estimates in 45042, 22.3% are under 18 and 20.0% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (87.9%).
- Under 1822.3%
- 18 to 6457.8%
- 65 and older20.0%
- White, not Hispanic87.9%
- Other or two or more5.0%
- Hispanic or Latino4.0%
- Black, not Hispanic2.6%
- Asian, not Hispanic0.4%
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 45042 earn?
Median household income is $69,520 (ACS 2020-2024), the 10th highest of the 13 ranked ZIP codes in Butler County. It is not measurably different from 2015-2019 ($68,828 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $69,520
- Income per person
- $39,573
- Below the poverty line
- 11.0%
- Unemployed (of the labor force)
- 2.9%
- Adults 25+ with a bachelor's degree
- 21.2%
- Adjusted gross income per tax return, 2022
- $64,67313,410 returns; wages 70% 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 45042?
FHFA's house price index for 45042, built from repeat sales and appraisals of the same homes, rose 115% from 2015 to 2025 and rose 60% from 2020 to 2025, and moved +10.4% in 2025.
- Median home value (owners' estimate)
- $202,200
- Median gross rent
- $922
- Homes owned by their occupants
- 72.2%
- Housing units
- 12,216
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 45042?
355 business establishments had a location in this ZIP code in 2023, 12 fewer than in 2018; the most are in retail trade (ZIP Code Business Patterns).
- Retail trade50
- Health care and social assistance48
- Other services (except public administration)38
- Construction37
- Accommodation and food services31
- Professional, scientific, and technical services26
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 45042?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 45327 | Germantown | 9,315 | $95k | 5.0 mi |
| 45044 | Middletown | 56,217 | $74k | 5.2 mi |
| 45067 | Trenton | 15,471 | $82k | 5.4 mi |
| 45005 | Franklin | 32,251 | $75k | 7.2 mi |
| 45070 | West Elkton | 142 | $50k | 7.7 mi |
| 45064 | Somerville | 3,373 | $103k | 10.2 mi |
| 45311 | Camden | 5,701 | $69k | 13.6 mi |
| 45050 | Monroe | 12,248 | $104k | 8.3 mi (near) |
| 45055 | Overpeck | 198 | – | 8.4 mi (near) |
| 45330 | Gratis | 710 | $77k | 8.6 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.