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Where am ILOCATED

Lewis and Clark County, Montana

Lewis and Clark County, Montana, has 75,331 residents (July 2025 estimate). Its county seat is Helena. It uses Mountain Time and covers 3,458 sq mi (8,957 km²) of land.

BillingsMissoulaGreat Falls
Lewis and Clark County in Montana
Cascade CountyMeagher CountyPowell CountyTeton CountyHelenaHelena Valley West CentralHelena Valley Northwest
Lewis and Clark County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
75,331
Land area
3,458 sq mi (8,957 km²)
County seat or government
Helena
Time zone
Mountain TimeUTC-07:00 in January; UTC-06:00 in July
Median household income
$78,237 ± $3,203
Median home value
$393,500 ± $9,364
Median rent, with utilities
$1,102 ± $46
Homes lived in by their owners
70.1% ± 1.7 points
County type
County
Metro or micro area
Helena, MT metro areaCentral county
Water area
39.2 sq mi (101 km²)
State
Montana
County code (FIPS)
30049
Coordinates (central point)
47.122105, -112.382890
Open this point in the location finder

These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.

Time zones in Lewis and Clark County

Time zoneLocal time and UTC offsetNext clock change
Mountain TimeAmerica/DenverUTC-07:00 in January; UTC-06:00 in July. Enable JavaScript for the live clock.Enable JavaScript for upcoming changes.

Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.

ZIP Code areas, largest first

  1. 5960131,728 people
  2. 5960230,754 people
  3. 596358,292 people
  4. 594212,069 people
  5. 596391,021 people
  6. 59625663 people
  7. 59410520 people
  8. 59648486 people
  9. 59633272 people
  10. 59640160 people
  11. 5963632 people
  12. 596230 people

12 ZIP Code areas overlap Lewis and Clark County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.

Official county information

Lewis and Clark County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

School districts in Lewis and Clark County, largest first

  1. Helena High School District61,505 people
  2. Helena Elementary School District58,653 people
  3. East Helena K-1210,353 people
  4. Trinity Elementary School District2,190 people
  5. Lincoln K-12 Schools1,021 people
  6. Wolf Creek Elementary School District662 people
  7. Augusta High School District585 people
  8. Augusta Elementary School District545 people
  9. Auchard Creek Elementary School District40 people

Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

  1. Helena, Montana (city)33,639 people
  2. Helena Valley Southeast, Montana (CDP)9,108 people
  3. Helena Valley West Central, Montana (CDP)8,056 people
  4. Helena Valley Northwest, Montana (CDP)5,183 people
  5. Helena Valley Northeast, Montana (CDP)4,659 people
  6. East Helena, Montana (city)1,702 people
  7. Helena West Side, Montana (CDP)1,417 people
  8. Lincoln, Montana (CDP)908 people
  9. Unionville, Montana (CDP)412 people
  10. York, Montana (CDP)182 people
  11. Craig, Montana (CDP)172 people
  12. Augusta, Montana (CDP)165 people
All 18
  1. Marysville, Montana (CDP)160 people
  2. Rimini, Montana (CDP)118 people
  3. Milford Colony, Montana (CDP)40 people
  4. Canyon Creek, Montana (CDP)27 people
  5. Gilman, Montana (CDP)12 people
  6. Wolf Creek, Montana (CDP)12 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Powell County, Montana32 mi southwest
  2. Teton County, Montana48 mi north
  3. Cascade County, Montana50 mi east
  4. Broadwater County, Montana69 mi southeast
  5. Jefferson County, Montana71 mi south
  6. Meagher County, Montana78 mi southeast
  7. Flathead County, Montana112 mi northwest

Before using this answer on a form

Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.

Find the county where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.