Residential delivery area · Kentucky
ZIP Code 40031: La Grange, KY
ZIP code 40031 uses the postal name La Grange, Kentucky and lies mostly in Oldham County (93% of its land) with the rest in Henry County (Census 2020 ZIP-county file). About 26,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $98,513 (Census Bureau, ACS 2020-2024). By Census place, its land lies in La Grange (11%) and Buckner (9%); 80% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- La Grange · its only residential ZIP
- County
- Oldham County (93%); Henry County (7%)
- Census places
- La Grange (11%); Buckner (9%) census-designated place
- Metro area
- Louisville/Jefferson County, KY-IN
- House district
- KY-4 119th Congress
- State
- Kentucky
- Time zone
- Eastern
- Land area
- 66.9 sq mi · 393 people per sq mi
- PO Box ZIPs
- 40032 also use the name La Grange
Where is ZIP code 40031?
40031 centers on 38.429°, -85.401° and covers 66.9 square miles of land plus 0.9 of water. It borders 6 ZIP codes: 40010, 40077, 40055, 40026, 40014, 40068.
The map draws ZIP code areas only. For the streets inside 40031, 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 40031 compare with the rest of Oldham County?
| Measure | 40031 | In Oldham County | In KY |
|---|---|---|---|
| People (ACS 2020-2024) | 26,259 | 2nd of 10 | 47th of 780 |
| Median household income | $99k | 5th of 8 | 23rd of 310 |
| Median home value | $341k | 5th of 7 | 18th of 320 |
Its median household income is higher than in 80% of U.S. residential ZIP codes, and it is denser than 70% 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 40031?
The 2020 Census counted 25,322 people in 40031; the ACS, which samples households over 2020-2024, estimates 26,259. Between the 2010 and 2020 censuses its population grew 10.8% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 26,259
- 2020 Census count
- 25,322+10.8% since 2010 (22,863)
- Households
- 8,232
- Median age
- 39.4
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 40031?
Of the 26,259 people the ACS estimates in 40031, 20.4% are under 18 and 15.0% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (83.5%).
- Under 1820.4%
- 18 to 6464.6%
- 65 and older15.0%
- White, not Hispanic83.5%
- Hispanic or Latino6.8%
- Black, not Hispanic4.6%
- Other or two or more4.3%
- Asian, not Hispanic0.8%
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 40031 earn?
Median household income is $98,513 (ACS 2020-2024), the 5th highest of the 8 ranked ZIP codes in Oldham County. It is not measurably different from 2015-2019 ($91,265 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $98,513
- Income per person
- $38,010
- Below the poverty line
- 6.8%
- Unemployed (of the labor force)
- 3.0%
- Adults 25+ with a bachelor's degree
- 34.7%
- Adjusted gross income per tax return, 2022
- $89,29110,360 returns; wages 73% 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 40031?
FHFA's house price index for 40031, built from repeat sales and appraisals of the same homes, rose 88% from 2015 to 2025 and rose 54% from 2020 to 2025, and moved +4.8% in 2025.
- Median home value (owners' estimate)
- $341,000
- Median gross rent
- $1,092
- Homes owned by their occupants
- 82.0%
- Housing units
- 8,617
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 40031?
486 business establishments had a location in this ZIP code in 2023, 63 more than in 2018; the most are in health care and social assistance (ZIP Code Business Patterns).
- Health care and social assistance72
- Construction67
- Professional, scientific, and technical services60
- Accommodation and food services55
- Retail trade52
- Other services (except public administration)43
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 40031?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 40010 | Buckner | 678 | $196k | 5.1 mi |
| 40077 | Westport | 678 | $73k | 5.1 mi |
| 40055 | Pendleton | 1,942 | $98k | 6.1 mi |
| 40026 | Goshen | 5,975 | $134k | 6.3 mi |
| 40014 | Crestwood | 23,101 | $121k | 6.4 mi |
| 40068 | Smithfield | 2,570 | $81k | 6.8 mi |
| 47104 | Bethlehem, IN | 9 | – | 8.8 mi (near) |
| 40070 | Sulphur | 360 | – | 9.4 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 La Grange?
1 more ZIP code carries the postal name La Grange, KY 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 |
|---|---|
| 40032 | Oldham 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.