Residential delivery area · Ohio
ZIP Code 45040: Mason, OH
ZIP code 45040 is in Mason, Ohio, entirely in Warren County (Census 2020 ZIP-county file). About 60,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $133,240 (Census Bureau, ACS 2020-2024). By Census place, 62% of its land lies in Mason, and 3% in smaller places; 35% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Mason · its only residential ZIP
- County
- Warren County
- Census places
- Mason
- Metro area
- Cincinnati, OH-KY-IN
- House district
- OH-1 119th Congress
- State
- Ohio
- Time zone
- Eastern
- Land area
- 28.5 sq mi · 2,092 people per sq mi
Where is ZIP code 45040?
45040 centers on 39.351°, -84.313° and covers 28.5 square miles of land plus 0.0 of water. It borders 8 ZIP codes: 45034, 45039, 45249, 45069, 45241, 45140, 45036, 45044.
The map draws ZIP code areas only. For the streets inside 45040, 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 45040 compare with the rest of Warren County?
| Measure | 45040 | In Warren County | In OH |
|---|---|---|---|
| People (ACS 2020-2024) | 59,518 | 1st of 21 | 12th of 1,233 |
| Median household income | $133k | 1st of 17 | 22nd of 755 |
| Median home value | $440k | 2nd of 18 | 24th of 810 |
Its median household income is higher than in 94% of U.S. residential ZIP codes, and it is denser than 85% 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 45040?
The 2020 Census counted 57,153 people in 45040; the ACS, which samples households over 2020-2024, estimates 59,518. Between the 2010 and 2020 censuses its population grew 12.9% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 59,518
- 2020 Census count
- 57,153+12.9% since 2010 (50,627)
- Households
- 22,000
- Median age
- 41.5
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 45040?
Of the 59,518 people the ACS estimates in 45040, 24.7% are under 18 and 14.1% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (68.2%), then Asian (not Hispanic) (19.7%).
- Under 1824.7%
- 18 to 6461.2%
- 65 and older14.1%
- White, not Hispanic68.2%
- Asian, not Hispanic19.7%
- Other or two or more4.5%
- Hispanic or Latino4.0%
- Black, not Hispanic3.6%
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 45040 earn?
Median household income is $133,240 (ACS 2020-2024), the highest of the 17 ranked ZIP codes in Warren County. It is not measurably different from 2015-2019 ($128,537 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $133,240
- Income per person
- $66,545
- Below the poverty line
- 4.6%
- Unemployed (of the labor force)
- 2.4%
- Adults 25+ with a bachelor's degree
- 63.0%
- Adjusted gross income per tax return, 2022
- $139,52728,110 returns; wages 74% 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 45040?
FHFA's house price index for 45040, built from repeat sales and appraisals of the same homes, rose 108% from 2015 to 2025 and rose 69% from 2020 to 2025, and moved +4.4% in 2025.
- Median home value (owners' estimate)
- $440,000
- Median gross rent
- $1,811
- Homes owned by their occupants
- 77.7%
- Housing units
- 22,719
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 45040?
1,588 business establishments had a location in this ZIP code in 2023, 166 more than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services241
- Health care and social assistance198
- Accommodation and food services193
- Retail trade140
- Other services (except public administration)122
- Finance and insurance104
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 45040?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 45034 | Kings Mills | 968 | $152k | 3.6 mi |
| 45039 | Maineville | 28,335 | $109k | 4.4 mi |
| 45249 | Cincinnati | 14,490 | $106k | 5.3 mi |
| 45069 | West Chester | 56,037 | $115k | 5.3 mi |
| 45241 | Cincinnati | 23,955 | $104k | 6.9 mi |
| 45140 | Loveland | 57,211 | $115k | 7.5 mi |
| 45036 | Lebanon | 42,204 | $99k | 8.2 mi |
| 45044 | Middletown | 56,217 | $74k | 10.5 mi |
| 45065 | South Lebanon | 7,053 | $105k | 5.5 mi (near) |
| 45050 | Monroe | 12,248 | $104k | 7.1 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.