Residential delivery area · Ohio
ZIP Code 45123: Greenfield, OH
ZIP code 45123 uses the postal name Greenfield, Ohio and lies mostly in Highland County (43% of its land), reaching into Ross County and Fayette County (Census 2020 ZIP-county file). About 8,700 people live there (Census Bureau, ACS 2020-2024). Median household income is $62,404 (Census Bureau, ACS 2020-2024). By Census place, 2% of its land lies in Greenfield; 98% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Greenfield · its only residential ZIP
- County
- Highland County (43%); Ross County (33%); Fayette County (24%)
- Census places
- Greenfield
- House districts
- OH-2 (90%), OH-15 (10%) 119th Congress, by share of land
- State
- Ohio
- Time zone
- Eastern
- Land area
- 106.8 sq mi · 82 people per sq mi
Where is ZIP code 45123?
45123 centers on 39.349°, -83.389° and covers 106.8 square miles of land plus 1.2 of water. It borders 6 ZIP codes: 45681, 45135, 45628, 45612, 43160, 45133.
The map draws ZIP code areas only. For the streets inside 45123, 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 45123 compare with the rest of Highland County?
| Measure | 45123 | In Highland County | In OH |
|---|---|---|---|
| People (ACS 2020-2024) | 8,740 | 3rd of 15 | 408th of 1,233 |
| Median household income | $62k | 8th of 12 | 518th of 755 |
| Median home value | $162k | 9th of 12 | 576th of 810 |
Its median household income is higher than in 34% of U.S. residential ZIP codes, and it is denser than 51% 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 45123?
The 2020 Census counted 8,776 people in 45123; the ACS, which samples households over 2020-2024, estimates 8,740. Between the 2010 and 2020 censuses its population grew 1.2% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 8,740
- 2020 Census count
- 8,776+1.2% since 2010 (8,671)
- Households
- 3,313
- Median age
- 36.8
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 45123?
Of the 8,740 people the ACS estimates in 45123, 27.5% are under 18 and 15.6% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (90.6%).
- Under 1827.5%
- 18 to 6456.9%
- 65 and older15.6%
- White, not Hispanic90.6%
- Other or two or more4.6%
- Black, not Hispanic3.1%
- Hispanic or Latino1.5%
- Asian, not Hispanic0.2%
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 45123 earn?
Median household income is $62,404 (ACS 2020-2024), the 8th highest of the 12 ranked ZIP codes in Highland County. It is not measurably different from 2015-2019 ($58,547 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $62,404±$11,744
- Income per person
- $29,397
- Below the poverty line
- 17.6%
- Unemployed (of the labor force)
- 2.3%
- Adults 25+ with a bachelor's degree
- 13.8%
- Adjusted gross income per tax return, 2022
- $52,7183,650 returns; wages 72% 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 45123?
FHFA's house price index for 45123, built from repeat sales and appraisals of the same homes, rose 145% from 2015 to 2025 and rose 81% from 2020 to 2025, and moved +18.4% in 2025.
- Median home value (owners' estimate)
- $161,700
- Median gross rent
- $756
- Homes owned by their occupants
- 68.4%
- Housing units
- 3,806
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 45123?
134 business establishments had a location in this ZIP code in 2023, 19 more than in 2018; the most are in retail trade (ZIP Code Business Patterns).
- Retail trade27
- Health care and social assistance16
- Accommodation and food services16
- Construction14
- Other services (except public administration)14
- Manufacturing10
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 45123?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 45681 | South Salem | 1,451 | $50k | 7.8 mi |
| 45135 | Leesburg | 5,291 | $80k | 8.2 mi |
| 45628 | Frankfort | 5,999 | $73k | 10.8 mi |
| 45612 | Bainbridge | 4,933 | $54k | 11.4 mi |
| 43160 | Washington Court House | 22,105 | $62k | 12.7 mi |
| 45133 | Hillsboro | 23,443 | $62k | 16.3 mi |
| 45132 | Highland | 87 | $35k | 11.3 mi (near) |
| 45624 | Cynthiana | 0 | – | 12.3 mi (near) |
| 45617 | Bourneville | 0 | – | 13.4 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.