What is the largest city in Yellowstone County, MT?

Billings is the largest city or town in Yellowstone County, with about 119,434 residents.

How many ZIP codes are in Yellowstone County?

Yellowstone County includes 12 ZIP Code Tabulation Areas, including 59002, 59006, 59015, 59024, 59037.

What is the population of Yellowstone County, MT?

About 168,957 people live in Yellowstone County, based on American Community Survey 5-year estimates.

What counties border Yellowstone County?

Yellowstone County borders Big Horn County, Carbon County, Stillwater County, Rosebud County, Musselshell County, Golden Valley County, Treasure County.

Yellowstone County, MT: Cities, ZIP Codes & Local Data

Population

168,957

Land area

2,633sq mi

People per sq mi

64

ZIP codes

12

Yellowstone County at a glance

Yellowstone County is about 8.4 times as dense as Montana as a whole.
No county in Montana has more people.
The median household income is $76,570, 6% above the Montana median of $72,509.
A typical owner-occupied home is valued at $349,500 (7% below Montana) and median rent is $1,131 a month.
Its largest cities are Billings (119,434), Laurel (7,215) and Lockwood (7,181).

Local data for Yellowstone County, MT

Counts from official public data

Housing and community stats

Yellowstone County, MT, American Community Survey 2020-2024

Full profile

Median household income

$76,570

Poverty rate

9.2%

Median home value

$349,500

Prices +1.2% in a year

Median rent

$1,131/mo

Homeownership

69.6%

Bachelor's or higher

34.1%

Median age

39.0

Average commute

18.6 min

Largest reported origins and ancestries: German Americans (48,998), Irish Americans (22,364), Norwegian Americans (15,679).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

2.5%

Sep 2026, -0.6 pts in a year

Average annual pay

$64,980

87,416 jobs, 2025

Income per person

$72,985

BEA, 2024

Federal spending

$1.2B

FY 2026, $7,254 per person

PPP loans

$440M

5,468 loans, 51,739 jobs reported

Campaign donations

$1.4M

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

Yellowstone County, MT, workers 16 and older. American Community Survey 5-year estimates

Drove alone77.4%
Carpooled9.4%
Public transit1.0%
Walked1.9%
Bicycle0.5%
Taxi, ride-hailing, motorcycle or other1.0%
Worked from home8.9%

Average one-way commute: 18.6 minutes for people who do not work from home.

Environment and hazard risk

Yellowstone County, MT, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Moderate

Top: winter weather

Storm events since 1996

900

Most often hail

Flood insurance policies

233

0.4% of homes, county

July high / Jan low

87° / 12°F

14.4 inches of rain a year

Hazards, floods and storm history Check a flood zone 28 historic places

Health statistics

Share of adults in Yellowstone County, MT, CDC PLACES estimates

All 40 measures

Obesity

34.0%

U.S. 33.3% +0.7 pts

Diabetes

9.5%

U.S. 12.1% -2.6 pts

Smoking

13.9%

U.S. 12.8% +1.1 pts

Uninsured (18-64)

9.0%

U.S. 11.1% -2.1 pts

Cities, towns and ZIP codes in Yellowstone County

Population shown

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Frequently asked questions

What is the largest city in Yellowstone County, MT?: Billings is the largest city or town in Yellowstone County, with about 119,434 residents.
How many ZIP codes are in Yellowstone County?: Yellowstone County includes 12 ZIP Code Tabulation Areas, including 59002, 59006, 59015, 59024, 59037.
What is the population of Yellowstone County, MT?: About 168,957 people live in Yellowstone County, based on American Community Survey 5-year estimates.
What counties border Yellowstone County?: Yellowstone County borders Big Horn County, Carbon County, Stillwater County, Rosebud County, Musselshell County, Golden Valley County, Treasure County.