ZIP Code Tabulation Area · Montana

ZIP Code 59640: Lewis and Clark County, MT

ZIP Code 59640 (Lewis and Clark County, Montana) has an estimated 160 residents in 58 households. The median household income is $99,167, the median home value is $287,500 and the median gross rent is —. Figures are U.S. Census Bureau American Community Survey 2020–2024 5-year estimates for the matching ZIP Code Tabulation Area.

American Community Survey 2020–2024 5-year estimates · Updated Oct 26, 2026

Some estimates have a large margin of error. 8 figures for this ZIP (population, median age, household income, unemployment, bachelor's or higher, owner-occupied, commute, work from home) are marked with *. ACS figures come from a sample, and small areas have fewer responses, so treat these numbers as rough ranges.

Total population

160*

Margin of error ±150· estimate has a large margin of error

Median household income

$99,167*

Margin of error ±$64,055· estimate has a large margin of error

Median home value

$287,500

Margin of error ±$140,642

Median gross rent

—

Margin of error not available

Median age

55.1 yrs*

Margin of error ±28.9 yrs· estimate has a large margin of error

Mean travel time to work

20.2 min*

Margin of error ±24.3 min· estimate has a large margin of error

How ZIP 59640 compares with Montana and the U.S.

State and national figures are the Census Bureau's own estimates for those areas from the same ACS release, not averages of ZIP codes.

Median age

ZIP 5964055.1 yrs*Montana40.4 yrsUnited States38.9 yrs

Median household income

ZIP 59640$99,167*Montana$72,509United States$80,734

Per capita income

ZIP 59640$42,500Montana$41,711United States$44,673

Poverty rate

ZIP 596403.8%Montana11.5%United States12.5%

Unemployment rate

ZIP 596400.0%*Montana3.6%United States5.2%

Bachelor's degree or higher

ZIP 5964050.9%*Montana35.2%United States35.7%

Median home value

ZIP 59640$287,500Montana$375,800United States$332,700

Median gross rent

ZIP 59640—Montana$1,081/moUnited States$1,413/mo

Owner-occupied homes

ZIP 5964074.1%*Montana69.2%United States65.2%

Mean travel time to work

ZIP 5964020.2 min*Montana19.1 minUnited States26.4 min

Worked from home

ZIP 5964018.8%*Montana12.5%United States15.1%

All figures for ZIP 59640

Each estimate has a 90% margin of error: the true value is likely within that range. * marks estimates with a large margin of error (a coefficient of variation above 30%, or ±10 percentage points or more for rates).

ZIP 59640 — ACS 2020–2024 5-year estimates
Measure	ZIP 59640	Margin of error	Montana	United States
Total population	160*	±150	1,116,875	334,922,499
Median age	55.1 yrs*	±28.9 yrs	40.4 yrs	38.9 yrs
Households	58	±28	458,859	129,227,496
Median household income	$99,167*	±$64,055	$72,509	$80,734
Per capita income	$42,500	±$7,985	$41,711	$44,673
Poverty rate	3.8%	±4.4 pts	11.5%	12.5%
Unemployment rate	0.0%*	±15.9 pts	3.6%	5.2%
Bachelor's degree or higher	50.9%*	±30.1 pts	35.2%	35.7%
Median home value	$287,500	±$140,642	$375,800	$332,700
Median gross rent	—	—	$1,081/mo	$1,413/mo
Owner-occupied homes	74.1%*	±24.0 pts	69.2%	65.2%
Mean travel time to work	20.2 min*	±24.3 min	19.1 min	26.4 min
Worked from home	18.8%*	±24.6 pts	12.5%	15.1%

Race and Hispanic or Latino origin

Shares of the total population by the Census Bureau's race and Hispanic or Latino origin categories (table B03002), listed in the Census Bureau's order. People self-identify on the survey.

Population by race and Hispanic or Latino origin, ZIP 59640
Group	ZIP 59640	Montana	United States
White alone, not Hispanic or Latino	100.0%	83.6%	57.4%
Black or African American alone, not Hispanic or Latino	0.0%	0.4%	11.9%
American Indian and Alaska Native alone, not Hispanic or Latino	0.0%	5.3%	0.5%
Asian alone, not Hispanic or Latino	0.0%	0.8%	5.9%
Native Hawaiian and Other Pacific Islander alone, not Hispanic or Latino	0.0%	0.0%	0.2%
Some other race alone, not Hispanic or Latino	0.0%	0.5%	0.6%
Two or more races, not Hispanic or Latino	0.0%	4.7%	4.3%
Hispanic or Latino (of any race)	0.0%	4.6%	19.3%

Where ZIP 59640 is

State: Montana
Main county: Lewis and Clark County
Largest overlapping place: Marysville (2% of the ZIP's land area)
Land area: 20.19 sq mi· about 8 people per sq mi

County and place names come from the Census Bureau's 2020 ZCTA relationship files. A ZIP code's mailing city, set by the U.S. Postal Service, can differ from these names.

Other ZIP codes in Lewis and Clark County

59410 Lewis and Clark County, MT 59601 Lewis and Clark County, MT 59602 Lewis and Clark County, MT 59625 Helena, MT 59633 Lewis and Clark County, MT 59635 Spokane Creek, MT 59636 Helena West Side, MT 59639 Lewis and Clark County, MT 59648 Lewis and Clark County, MT

See every ZIP code in Montana, or compare ZIP 59640 with another ZIP code.

Census figures describe residents as a group and cannot tell you about any one home or street. For a specific address, check local government and housing records.

About ZIP codes and ZCTAs: the Census Bureau publishes statistics for ZIP Code Tabulation Areas, which approximate USPS ZIP code delivery areas. Learn how they differ.

Sources

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, detailed tables B01003, B01002, B11001, B19013, B19301, B17001, B23025, B15003, B25077, B25064, B25003, B08013, B08303, B08301, B03002 — snapshot Oct 26, 2026.
U.S. Census Bureau, 2020 ZCTA5 relationship files (county and place).
Data: U.S. Census Bureau, American Community Survey 5-year estimates (detailed tables) and 2020 Census ZCTA relationship files. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau. These agencies do not endorse OpenZIP.