What is the county seat of Cascade County?

The county seat of Cascade County is Great Falls.

Is there an online parcel map for Cascade County?

Yes. Cascade County publishes a parcel map of 23,467 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Cascade County's boundary or name changed?

Cascade County was created in 1887 from Choteau County, Chouteau County, Fergus County, Lewis and Clark County and Meagher County. Since then the Atlas of Historical County Boundaries records 10 later changes, chiefly involving Lewis and Clark County, Meagher County and Choteau County.

Is my lot in a flood zone?

We do not have flood maps for Cascade County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

County · code 30013

Cascade CountyMontana

Cascade County, Montana, was created on December 19, 1887, from parts of four existing counties and is located in west-central Montana with Great Falls as its county seat.

Founded1887
County seatGreat Falls
Land area2,698 sq mi + 13 sq mi water
Population84,414 2020 Census
Parcels mapped23,467 checked 15 October 2026

Open the free map Click any parcel in Cascade County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated 20 October 2026

Census outline · seat marked

History

Formed in 1887 from Choteau County, Chouteau County, Fergus County, Lewis and Clark County and Meagher County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Cascade County was initially created by Montana Territory from Chouteau, Fergus, Lewis and Clark, and Meagher counties but was not fully organized until February 1, 1888. The county became part of the state of Montana when statehood was achieved on November 8, 1889. Over the following decades, Cascade County gained and lost territory through boundary adjustments with neighboring counties, including Meagher, Chouteau, and Lewis and Clark, and lost land to the creation of Judith Basin County in 1920.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

1887
Cascade County created Cascade created by Montana Territory from Choteau (now Chouteau), Fergus, Lewis and Clark, and Meagher; Cascade not fully organized, attached to Choteau "for judicial purposes." Act passed 12 September 1887; took effect 19 December 1887.
from Choteau from Chouteau from Fergus from Lewis and Clarkfrom Meagher
19 December 1887 · Mont. Terr. Laws 1887, 15th leg., ext. sess., pp. 105-109
1889
Became part of Montana Cascade became a county in the state of Montana. 8 November 1889 · U.S. Stat., vol. 26, pp. 1551-1552 and vol. 25, ch. 180 [1889]/pp. 676-684; Swindler, 6:82-83
1897
Lost territory Cascade lost to Lewis and Clark.
to Lewis and Clark
5 March 1897 · Mont. Laws 1897, 5th leg., pp. 53-55
1899
Gained territory Cascade gained from Meagher.
from Meagher
28 February 1899 · Mont. Laws 1899, 6th leg., pp. 41-42
1899
Gained territory Cascade gained from Meagher.
from Meagher
6 March 1899 · Mont. Laws 1899, 6th leg., p. 43

Show all 11 changes (6 more)

1887
Cascade County created Cascade created by Montana Territory from Choteau (now Chouteau), Fergus, Lewis and Clark, and Meagher; Cascade not fully organized, attached to Choteau "for judicial purposes." Act passed 12 September 1887; took effect 19 December 1887.
from Choteau from Chouteau from Fergus from Lewis and Clarkfrom Meagher
19 December 1887 · Mont. Terr. Laws 1887, 15th leg., ext. sess., pp. 105-109
1888
Changed Cascade fully organized, detached from Choteau (now Chouteau).
ChoteauChouteau
1 February 1888 · Mont. Terr. Laws 1887, 15th leg., ext. sess., sec. 13/p. 109
1889
Became part of Montana Cascade became a county in the state of Montana. 8 November 1889 · U.S. Stat., vol. 26, pp. 1551-1552 and vol. 25, ch. 180 [1889]/pp. 676-684; Swindler, 6:82-83
1897
Gained territory Cascade gained from Meagher and exchanged small areas with Meagher along Smith River.
from Meagher
1 March 1897 · Mont. Laws 1897, 5th leg., pp. 50-52
1897
Lost territory Cascade lost to Lewis and Clark.
to Lewis and Clark
5 March 1897 · Mont. Laws 1897, 5th leg., pp. 53-55
1899
Gained territory Cascade gained from Meagher.
from Meagher
28 February 1899 · Mont. Laws 1899, 6th leg., pp. 41-42
1899
Gained territory Cascade gained from Meagher.
from Meagher
6 March 1899 · Mont. Laws 1899, 6th leg., p. 43
1903
Gained territory Cascade gained from Choteau (now Chouteau).
from Choteaufrom Chouteau
3 March 1903 · Mont. Laws 1903, 8th leg., ch. 51/pp. 111-112
1920
Lost territory Cascade lost to creation of Judith Basin.
to Judith Basin
10 December 1920 · Mont. Rev. Code 1921, sec. 4327/pp. 1584-1586; Burlingame, 17-20
1921
Changed Part of Cascade boundary with Lewis and Clark placed on federal land survey line according to the Cascade boundary description; change was not reflected in Lewis and Clark description (no change).
Lewis and Clark
1 June 1921 · Mont. Rev. Code 1921, secs. 4311, 4328/pp. 1563, 1586-1587
1941
Exchanged territory Cascade exchanged small areas with Lewis and Clark.
with Lewis and Clark
28 February 1941 · Mont. Laws 1941, 27th leg., ch. 58/pp. 89-93

Land and parcels

What the maps cover in Cascade

Who publishes each layer, how good it is, and when we last checked.

Parcels Good enough

Lot lines and tax-map numbers for 23,467 parcels from Cascade County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 7 October 2024 · checked 15 October 2026
Address points Official

One point per address, 48,255 in all from Montana State Library.
edited 13 October 2026 · checked 14 October 2026
Buildings Reference

Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026

Official: from the office that keeps the record
Good enough: a reliable statewide or national copy
Fallback: a guide only; check the official record
Missing: nothing public found yet

People and land

Cascade by the Census

Population

84,414 2020 Census count

Housing units

38,937 2020 Census count

Land area

2,698 square miles

Water area

13 square miles

People per sq mi

31 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Cascade County's official site

We have found the county's site but not its offices yet; start there.

County government

County government
The official website of Cascade County.
co.cascade.mt.us

See your own lot on these maps

Open Cascade County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

Open the free map no sign-in Pro early access

Questions

Common questions about Cascade County

When was Cascade County founded?: Cascade County was founded in 1887, formed from Choteau County, Chouteau County, Fergus County, Lewis and Clark County and Meagher County.
What is the county seat of Cascade County?: The county seat of Cascade County is Great Falls.
Is there an online parcel map for Cascade County?: Yes. Cascade County publishes a parcel map of 23,467 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Cascade County's boundary or name changed?: Cascade County was created in 1887 from Choteau County, Chouteau County, Fergus County, Lewis and Clark County and Meagher County. Since then the Atlas of Historical County Boundaries records 10 later changes, chiefly involving Lewis and Clark County, Meagher County and Choteau County.
Is my lot in a flood zone?: We do not have flood maps for Cascade County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby