Counties in Montana
Each county page says how cases move there under Montana's rules, and lists the police agencies that serve it.
56 counties, largest first
- Yellowstone County172,692 people · 4 agencies
- Gallatin County128,740 people · 7 agencies
- Missoula County123,513 people · 3 agencies
- Flathead County115,429 people · 4 agencies
- Cascade County85,029 people · 4 agencies
- Lewis and Clark County75,331 people · 3 agencies
- Ravalli County48,582 people · 5 agencies
- Silver Bow County36,118 people · 1 agencies
- Lake County33,392 people · 4 agencies
- Lincoln County22,328 people · 4 agencies
- Park County18,214 people · 2 agencies
- Hill County16,167 people · 2 agencies
- Sanders County14,062 people · 4 agencies
- Glacier County13,463 people · 2 agencies
- Jefferson County13,329 people · 3 agencies
- Big Horn County12,752 people · 2 agencies
- Custer County12,034 people · 2 agencies
- Fergus County11,825 people · 2 agencies
- Carbon County11,466 people · 5 agencies
- Richland County11,377 people · 3 agencies
- Roosevelt County10,242 people · 4 agencies
- Beaverhead County10,043 people · 2 agencies
- Madison County10,026 people · 2 agencies
- Deer Lodge County9,709 people · 1 agencies
- Stillwater County9,445 people · 2 agencies
- Dawson County8,692 people · 2 agencies
- Broadwater County8,493 people · 1 agencies
- Rosebud County8,253 people · 2 agencies
- Valley County7,385 people · 3 agencies
- Powell County7,157 people · 2 agencies
- Blaine County6,860 people · 3 agencies
- Teton County6,496 people · 2 agencies
- Pondera County6,072 people · 3 agencies
- Chouteau County5,865 people · 2 agencies
- Musselshell County5,582 people · 2 agencies
- Toole County5,211 people · 2 agencies
- Mineral County5,185 people · 1 agencies
- Phillips County4,203 people · 2 agencies
- Sweet Grass County3,762 people · 1 agencies
- Granite County3,658 people · 1 agencies
- Sheridan County3,436 people · 2 agencies
- Fallon County2,959 people · 2 agencies
- Judith Basin County2,162 people · 1 agencies
- Meagher County2,137 people · 1 agencies
- Wheatland County2,100 people · 1 agencies
- Liberty County1,957 people · 1 agencies
- Powder River County1,781 people · 1 agencies
- McCone County1,720 people · 1 agencies
- Daniels County1,612 people · 2 agencies
- Carter County1,383 people · 2 agencies
- Garfield County1,148 people · 1 agencies
- Prairie County1,112 people · 1 agencies
- Wibaux County885 people · 2 agencies
- Golden Valley County844 people · 1 agencies
- Treasure County728 people · 1 agencies
- Petroleum County548 people · 1 agencies
Population: Census Bureau county population estimates, Vintage 2025 (cc-est2025-alldata), July 1, 2025.