Gallatin
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Gallatin

County
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Details

GEOID
30031
State
MT
Population
128,740 (2025 est.)
Data Source
Census tiger
Center Coordinates
45.5404, -111.1704

Geographic Boundary

Cities & Towns (10)

place Billings
121,239
place Missoula
78,903
place Great Falls
60,208
place Bozeman
58,814
place Butte-Silver Bow (balance)
35,469
place Helena
35,138
place Kalispell
31,851
place Belgrade
13,107
place Anaconda-Deer Lodge County
9,709
place Whitefish
9,358

Data Completeness

70% (7/10)
Geographic boundary
Center coordinates
Wikipedia link
Budget link
Agencies (11)
Services (3)
Legislative bodies (4)
Elected officials (2)
State abbreviation
Parent jurisdiction
Help fill in missing data

Agencies (11)

County Commission Office

Legislative Gallatin

Elected governing body overseeing county departments, budget, taxes, and property

County Administrator's Office

Executive Gallatin

Oversees Compliance, Court Services, Dispatch-911, Facilities, Finance, Grants, GIS, HR, IT, Open Space, Planning, Rest Home, and Road/Bridge

Finance Department

Executive Gallatin

County financial management, budgeting, and accounting

Sheriff's Office

Public_safety Gallatin

County law enforcement, detention, and search and rescue

Treasurer and Assessor's Office

Executive Gallatin

Property tax collection, assessment, and county financial management

Clerk and Recorder's Office

Executive Gallatin

Official county records, elections, and surveyor services

Planning Department

Executive Gallatin

Land use planning, zoning, and development review

Road and Bridge Department

Executive Gallatin

County road maintenance, construction, and bridge infrastructure

Clerk of District Court

Judicial Gallatin

Court services and public administrator

Justice Court

Judicial Gallatin

County justice court handling misdemeanors, civil claims, and traffic violations

Dispatch 911

Public_safety Gallatin

Emergency dispatch services for Gallatin County