Yellowstone County is a county of 168,957 people in Montana. That puts it in the top 6% of US counties for household income. 2% of residents were born outside the United States. The population is up 31% since 2000. Getting to work takes 19 minutes on average. There are 64 people per square mile.
At a glance
Lower income
median household income $76,570, below the US median
US median: $82,259
Mid-age
median age 39.0
US median: 38.9
Average education
34% hold a bachelor's degree
US average: 36%
Less affordable
home values up 97%, inflation adjusted
US median home: $376,019
Unique to this place
What stands out about Yellowstone County
What changed most since 1990
Median home value (2024 dollars)$150,484 → $349,500(+132%)US over the same years: +67%
White share93.7% → 83.4%(−10.3 pts)US over the same years: −17.8 pts
Hispanic share2.7% → 6.6%(+3.9 pts)US over the same years: +9.9 pts
Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.
Section 09 · Service history
Veterans
Veterans by period of service, 2024
Gulf War (2001 or later)24.2%(2,936)
US avg: 26.4%
Gulf War (1990s)21.7%(2,632)
US avg: 24.3%
Vietnam era34.4%(4,174)
US avg: 33.1%
Korean War4.9%(589)
US avg: 4.5%
World War II1.5%(185)
US avg: 1%
Share of the 12,127 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Over time
Yellowstone County, decade by decade
Yellowstone County population, inflation-adjusted income and home value, education, and diversity by year
Year
Population
Median household income
Median home value
Bachelor's degree+
Diversity score
1990
113,419
$62,263
$150,484
21.5%
15.0
2000
129,352
$66,904
$177,065
26.4%
21.1
2010
147,972
$69,974
$242,831
29.0%
27.1
2020
164,731
$75,910
$289,314
32.8%
38.0
2024
168,957
$76,570
$349,500
34.1%
36.5
Census years come from the decennial census and the latest year from the American Community Survey, so part of any change between those two rows can reflect the different surveys. Dollar figures are adjusted for inflation to 2024 dollars; a figure ending in "+" was at the Census Bureau's reporting cap that year. The diversity score runs from 0 to 100; see how it's calculated.