What city is 40031 in?

40031 is a La Grange, KY mailing address. By land area, 11% lies inside La Grange and 9% lies inside Buckner; the rest is outside any Census-defined city or community.

What is the population of 40031?

About 26,259 people (±930), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 25,322.

What is the median household income in 40031?

$98,513 (±$7,738), compared with $63,726 for Kentucky as a whole. Half the households in the ZIP code earn more and half earn less.

How many carrier routes and mailboxes are in 40031?

17 USPS carrier routes with 9,242 residential and 498 business mailboxes (9,742 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 40031?

The closest, measured center to center: 40010 (5.1 mi, Buckner), 40077 (5.1 mi, Westport), 40055 (6.1 mi), 40026 (6.3 mi, Goshen), 40014 (6.4 mi, Crestwood) and 40068 (6.8 mi, Smithfield).

40031 ZIP Code, La Grange, KY

Q: What county is 40031 in?

40031 is mostly in Oldham County (93% of its land), with smaller parts in Henry County.

40031 is a ZIP code in La Grange, Kentucky — mostly in Oldham County (93% of its land), with smaller parts in Henry County. It covers 67 square miles of land. The closest ZIP codes are 40010, 40077 and 40055. 26,259 people live here in 8,232 households, more than in 9 of every 10 Kentucky ZIP codes. With about 393 people per square mile it is lightly settled, and most homes are owner-occupied (82%). Median household income is $98,513, well above the Kentucky median of $63,726.

Quick facts

Mailing city: La Grange, KY
County: Oldham County
Land area: 67 sq mi
Population: 26,259
Median household income: $98,513
Carrier routes: 17 (9,242 homes)

Key figures

Measure	Value
Residents	26,259
Households	8,232
Median household income	$98,513
Income per person	$38,010
Median age	39.4
Homeowners	82.0%
Median home value	$341,000
Median rent	$1,092
Bachelor's degree or higher	34.7%
Average commute (minutes)	25.2
Households with kids under 18	35.4%
Moved in the past year	17.2%
Below the poverty line	6.8%
Broadband internet	93.8%
Speak a non-English language at home	7.1%

Household income

% of households	Value
<$10K	3.4%
$10–15K	2.3%
$15–25K	5.1%
$25–35K	4.1%
$35–50K	10.4%
$50–75K	12.7%
$75–100K	12.7%
$100–150K	21.5%
$150–200K	14.8%
$200K+	12.9%

Age

% of all residents	Value
<10	10.6%
10–19	11.7%
20–24	7.2%
25–34	14.3%
35–44	15.1%
45–54	14.4%
55–64	11.8%
65–74	9.7%
75+	5.2%

Tenure

% of housing units	Value
Owned, with mortgage	51.2%
Owned outright	27.4%
Rented	17.0%
Vacant	4.4%

Type of building

% of housing units	Value
Detached house	80.6%
Townhome	4.1%
2–4 units	3.9%
5–19 units	6.7%
20+ units	0.9%
Mobile / other	3.7%

Businesses in 40031

486 business establishments with 7,139 employees (ZIP Codes Business Patterns 2023).

Health Care and Social Assistance: 72
Construction: 67
Professional, Scientific, and Technical Services: 60
Accommodation and Food Services: 55
Retail Trade: 52
Other Services (except Public Administration): 43
Finance and Insurance: 31
Administrative and Support and Waste Management and Remediation Services: 30

EDDM carrier routes

40031 has 17 USPS carrier routes with 9,242 residential and 498 business mailboxes. Open the EDDM route map.

Carrier routes in 40031

40031 has 17 USPS carrier routes (4 city (C), 13 rural (R)) with 9,242 residential and 498 business mailboxes. Routes range from 165 homes (C004) to 720 homes (R012); the median route has 578 homes. The Census counted 8,232 households in 40031 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	1
250–499	3
500–749	13
750–999	0
1,000–1,499	0
1,500+	0

Best routes in 40031 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

Route R012 — USPS business mailboxes 117, 720 homes
Route C003 — USPS business mailboxes 116, 454 homes
Route R011 — USPS business mailboxes 54, 561 homes
Route C004 — USPS business mailboxes 45, 165 homes
Route C001 — USPS business mailboxes 35, 550 homes

Select these 5 routes on the route map

Every carrier route in 40031

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C001	City	550	35	$74,355	—	—	—
C002	City	564	31	$71,612	—	—	—
C003	City	454	116	$55,901	—	—	—
C004	City	165	45	$71,612	—	—	—
R001	Rural	581	10	$80,263	—	—	—
R002	Rural	583	8	$102,129	—	—	—
R003	Rural	614	0	$106,761	—	—	—
R004	Rural	559	12	$113,992	—	—	—
R005	Rural	578	11	$100,962	—	—	—
R006	Rural	628	1	$118,328	—	—	—
R007	Rural	677	4	$102,129	—	—	—
R008	Rural	316	6	$98,583	—	—	—
R009	Rural	639	10	$80,263	—	—	—
R010	Rural	417	17	$100,962	—	—	—
R011	Rural	561	54	$116,985	—	—	—
R012	Rural	720	117	$118,328	—	—	—
R013	Rural	636	21	$100,962	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 40031 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

40010 — Buckner CDP, KY (5.1 mi)
40077 — Westport CDP, KY (5.1 mi)
40055 (6.1 mi)
40026 — Goshen city, KY (6.3 mi)
40014 — Crestwood city, KY (6.4 mi)
40068 — Smithfield city, KY (6.8 mi)
47104 (8.8 mi)
40070 (9.4 mi)

Areas that include 40031

Where it ranks

Mail every home in 40031

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 40031, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 40031 in?: 40031 is a La Grange, KY mailing address. By land area, 11% lies inside La Grange and 9% lies inside Buckner; the rest is outside any Census-defined city or community.
What county is 40031 in?: 40031 is mostly in Oldham County (93% of its land), with smaller parts in Henry County.
What is the population of 40031?: About 26,259 people (±930), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 25,322.
What is the median household income in 40031?: $98,513 (±$7,738), compared with $63,726 for Kentucky as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 40031?: 17 USPS carrier routes with 9,242 residential and 498 business mailboxes (9,742 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 40031?: The closest, measured center to center: 40010 (5.1 mi, Buckner), 40077 (5.1 mi, Westport), 40055 (6.1 mi), 40026 (6.3 mi, Goshen), 40014 (6.4 mi, Crestwood) and 40068 (6.8 mi, Smithfield).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.