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U.S. Census Bureau · 2025 Population Estimates Program (PEP)

Montana County Population — 2025 PEP

July 1, 2025 resident population estimates for 56 counties. State total (sum of these county estimates): 1,144,694 persons.

Separate 2025 TIGER/Line county boundaries validate county identity; these are not ACS 2024 survey estimates.

Official Vintage 2025 county identities and unsimplified TIGER coordinates; separate-period ACS housing is joined only by exact full GEOID. Original 2020 counts require separately evidenced compatible geography; incompatible observations remain null with reasons. The revised April estimates base is not an original census count; no boundary allocation is invented.

Source and downloads

2025 Census PEP county estimates, 2020–2025 series; counts are persons, migration counts are persons, published rates are per 1,000, and unavailable values remain null (not zero). 2020 rates are unavailable for the partial-year interval. County totals and characteristics are verified against the pinned raw Census CSV receipts and independent 2025 county geometry.

Official Census PEP county source · Download JSON · Download CSV · Download source metadata

Official state totals and county summaries

Official NST July 1, 2025 state total: 1,144,694 persons (SUMLEV 040, PEP Vintage 2025). County sum: 1,144,694 persons; comparison status: equal.

Official NST July 2020: 1,087,156 persons; July 2020–July 2025 change: +57,538 persons; growth: 5.292525 percent (denominator: official July 2020 population).

County July 2024–July 2025: Growing: 38 · Shrinking: 16 · Unchanged: 2 · Missing: 0. Median county growth: 0.315847 percent.

Largest county: Yellowstone County (GEOID 30111): 172692 persons.

Fastest county growth: Richland County (GEOID 30083): 2.763978 percent.

Greatest numeric increase: Gallatin County (GEOID 30031): 1242 persons.

no minimum population; missing excluded per measure; median of county percentages, not population weighted; equal values use ascending full GEOID.

Official state demographics

Resident population · SUMLEV 040 · July 1, 2025 · Census PEP Vintage 2025. Denominator for every share: 1,144,694 resident persons. Six exclusive race groups; Hispanic origin overlaps race and must not be added to it. Release: June 2026; exact day unproved; PEP estimates have no ACS sampling MOE.

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Official state age, sex, race and overlapping Hispanic origin
MeasureCountShare
Female569,765 persons49.774438 percent
Male574,929 persons50.225562 percent
Ages 18–24105,331 persons9.201673 percent
Ages 25–44292,343 persons25.538965 percent
Ages 45–64261,595 persons22.852832 percent
Ages 65 and older253,772 persons22.169418 percent
Under 18231,653 persons20.237111 percent
American Indian or Alaska Native alone72,833 persons6.362661 percent
Asian alone11,501 persons1.004723 percent
Black or African American alone7,824 persons0.683501 percent
Native Hawaiian or other Pacific Islander alone1,265 persons0.110510 percent
Two or more races54,798 persons4.787131 percent
White alone996,473 persons87.051474 percent
Hispanic (any race)60,174 persons5.256776 percent
Not Hispanic1,084,520 persons94.743224 percent

Official state median age: 41.2 years. Published state SYASEX median age; not a county aggregation, not ACS.

Download all state demographic observations (CSV)

Revised April 1, 2020 estimates base (official NST): 1,084,221 persons; county base sum: 1,084,221 persons; comparison: equal. This is not the original decennial census count.

Original April 1, 2020 Census count: 56 compatible counties; 0 unavailable. Published Census county centers-of-population POPULATION, original 2020 Gazetteer and official 2020–2025 geographic-change evidence; no boundary allocation. Original count, revised April estimates base and July 2020 estimate are separate observations. Documentation: November 2021; exact file release day unproved; retrieval is not release. Official original count source. Original 2020 Gazetteer identity plus Census geographic-change notes 2014–2025; no county-level change recorded from 2020 onward, exact full modern name, and original count required. Any recorded county-level change or referenced counterparty is conservatively unavailable, including unresolved internal redistricting. Same GEOID alone is insufficient. Not a claim of identical cartographic coordinates; no invented allocations.

Source release date unavailable: retained pins do not attest an official release date; retrieval is not release. Reference dates and Vintage 2025 are explicit; no current-vintage refresh is implied.

County population and demographic explorer

Choose a measure, observation year and county without downloading boundaries. Rankings, search, trends and CSV work without a map. Load map explicitly to download the full, unsimplified 2025 TIGER boundaries; this defers rather than removes their payload. The table remains available without JavaScript.

PEP population · persons · July 1, 2025. Denominator: none. Calculation/source: CO POPESTIMATEy. Vintage 2025; null with metric_status reason; measured zero remains zero; no imputation.

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After loading, Tab to a county and press Enter or Space; colors and the legend indicate signed direction and magnitude. Outlines show selection. The county picker works before and after map loading.

Selected county demographic breakdown

July 1, 2025 · Yellowstone County (GEOID 30111). Same-period county population is the share denominator. Hispanic origin overlaps race; do not add origin to race counts. Other overlapping classifications are not additive. Official county median age is from PEP AGESEX MEDIAN_AGE_TOT, not ACS.

County demographics: counts, shares and official median age
Classification / sourceCount or statisticShare / status
Sex · PEP male84,991 persons49.215366 percent
Sex · PEP female87,701 persons50.784634 percent
Age bands · PEP under1837,623 persons21.786186 percent
Age bands · PEP age18 2414,223 persons8.236050 percent
Age bands · PEP age25 4446,927 persons27.173812 percent
Age bands · PEP age45 6439,098 persons22.640308 percent
Age bands · PEP age65plus34,821 persons20.163644 percent
Race alone (partition) · PEP white alone151,531 persons87.746392 percent
Race alone (partition) · PEP black alone1,421 persons0.822852 percent
Race alone (partition) · PEP aian alone9,187 persons5.319876 percent
Race alone (partition) · PEP asian alone1,521 persons0.880759 percent
Race alone (partition) · PEP nhpi alone245 persons0.141871 percent
Race alone (partition) · PEP two or more8,787 persons5.088250 percent
Hispanic origin (overlaps race) · PEP hispanic any race12,651 persons7.325759 percent
Hispanic origin (overlaps race) · PEP not hispanic160,041 persons92.674241 percent
Other overlapping classifications (not additive) · PEP white alone or combination160,019 persons92.661501 percent
Other overlapping classifications (not additive) · PEP not hispanic white alone142,283 persons82.391194 percent
Official county median age · AGESEX MEDIAN_AGE_TOT39.7 yearsNot a share; not ACS or an average of county medians

Use Ctrl/Command or Shift to select multiple counties. The following trend uses exact resident persons, not percentages; county size affects the scale. Missing observations break lines; the revised April estimates base is a separate dashed partial interval.

2025 county population rankings

All 56 county estimates are present without JavaScript, ranked by 2025 population (largest first). Signed changes compare July 1, 2024 to July 1, 2025. Unavailable is not zero; equal values break ties by GEOID (ascending).

Showing all 56 counties; ranked by 2025 population, descending.

Montana County Population — 2025 PEP — July 1, 2025; rank reflects the selected ordering
RankCountyGEOIDPopulation (persons)Signed change (persons)Signed change (percent)
1Yellowstone County30111172,692+1144 persons+0.666869%
2Gallatin County30031128,740+1242 persons+0.974133%
3Missoula County30063123,513+1042 persons+0.850814%
4Flathead County30029115,429+1062 persons+0.928590%
5Cascade County3001385,029+361 persons+0.426371%
6Lewis and Clark County3004975,331+239 persons+0.318276%
7Ravalli County3008148,582+545 persons+1.134542%
8Silver Bow County3009336,118+27 persons+0.074811%
9Lake County3004733,392+9 persons+0.026960%
10Lincoln County3005322,328+181 persons+0.817266%
11Park County3006718,214+41 persons+0.225609%
12Hill County3004116,167+52 persons+0.322681%
13Sanders County3008914,062+170 persons+1.223726%
14Glacier County3003513,463-52 persons-0.384758%
15Jefferson County3004313,329+98 persons+0.740685%
16Big Horn County3000312,752-95 persons-0.739472%
17Custer County3001712,034+57 persons+0.475912%
18Fergus County3002711,825-1 persons-0.008456%
19Carbon County3000911,466-38 persons-0.330320%
20Richland County3008311,377+306 persons+2.763978%
21Roosevelt County3008510,242+32 persons+0.313418%
22Beaverhead County3000110,043+53 persons+0.530531%
23Madison County3005710,026+254 persons+2.599263%
24Deer Lodge County300239,709-57 persons-0.583658%
25Stillwater County300959,445+16 persons+0.169689%
26Dawson County300218,692-47 persons-0.537819%
27Broadwater County300078,493+204 persons+2.461093%
28Rosebud County300878,253+35 persons+0.425894%
29Valley County301057,3850 persons0.000000%
30Powell County300777,157+36 persons+0.505547%
31Blaine County300056,860-16 persons-0.232693%
32Teton County300996,496+57 persons+0.885231%
33Pondera County300736,072+7 persons+0.115416%
34Chouteau County300155,865+12 persons+0.205023%
35Musselshell County300655,582+130 persons+2.384446%
36Toole County301015,211+58 persons+1.125558%
37Mineral County300615,185-2 persons-0.038558%
38Phillips County300714,203+7 persons+0.166826%
39Sweet Grass County300973,762-56 persons-1.466737%
40Granite County300393,658+19 persons+0.522121%
41Sheridan County300913,436-42 persons-1.207591%
42Fallon County300252,959-1 persons-0.033784%
43Judith Basin County300452,162+47 persons+2.222222%
44Meagher County300592,137+42 persons+2.004773%
45Wheatland County301072,100+42 persons+2.040816%
46Liberty County300511,957+6 persons+0.307535%
47Powder River County300751,781+23 persons+1.308305%
48McCone County300551,720+5 persons+0.291545%
49Daniels County300191,612-31 persons-1.886792%
50Carter County300111,383-39 persons-2.742616%
51Garfield County300331,148-27 persons-2.297872%
52Prairie County300791,112+4 persons+0.361011%
53Wibaux County30109885-27 persons-2.960526%
54Golden Valley County300378440 persons0.000000%
55Treasure County30103728-7 persons-0.952381%
56Petroleum County30069548+10 persons+1.858736%

County population trend · 2020–2025

Resident population (persons), not ACS housing. April 1, 2020 estimates base is distinct from the July 1, 2020 estimate. The April–July 2020 change is partial-year; the July 2020–July 2021 interval is the first July-to-July comparison. No 2020 annual rate is shown. Missing observations are unavailable, never zero.

Showing Yellowstone County (GEOID 30111). Select a county on the map or in the rankings table to update this trend.

Horizontal axis: year (2020–2025); vertical axis: resident population (persons). The 2020 base is a separate April 1 observation; July 1 estimates run from 2020 through 2025. Focus the chart viewport and use Left/Right arrows to scroll on narrow screens. Complete axis labels stay here outside the scrolling chart; the table gives exact values and availability.

Population observations for Yellowstone County (GEOID 30111), persons
DatePopulation (persons)Interval
April 1, 2020 base164,726Estimates base; not July 1
July 1, 2020165,208April–July partial-year; no annual rate
July 1, 2021167,444July 2020–July 2021 comparison
July 1, 2022169,743July-to-July estimate
July 1, 2023170,568July-to-July estimate
July 1, 2024171,548July-to-July estimate
July 1, 2025172,692July-to-July estimate

County population and median home value · different vintages

Each point pairs a county’s PEP July 1, 2025 resident population (persons) with its ACS 2024 5-year median owner-occupied home value (B25077, U.S. dollars). These are different reference periods and different statistical programs. This descriptive comparison does not imply causality or matched vintages. Suppressed, missing or invalid ACS estimates are unavailable, not zero and not plotted. A valid zero remains zero.

The exact-value table below works without JavaScript; chart loading requires JavaScript.

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County comparison: PEP July 1, 2025 population (persons) and ACS 2024 5-year median owner-occupied home value (U.S. dollars); unavailable values identified
CountyGEOIDPEP July 1, 2025 population (persons)ACS 2024 5-year median home value (U.S. dollars)
Beaverhead County3000110,043$308,300
Big Horn County3000312,752$143,400
Blaine County300056,860$155,500
Broadwater County300078,493$426,600
Carbon County3000911,466$420,800
Carter County300111,383$199,200
Cascade County3001385,029$265,300
Chouteau County300155,865$207,800
Custer County3001712,034$219,100
Daniels County300191,612$184,800
Dawson County300218,692$185,300
Deer Lodge County300239,709$231,700
Fallon County300252,959$244,800
Fergus County3002711,825$236,100
Flathead County30029115,429$535,500
Gallatin County30031128,740$667,600
Garfield County300331,148$169,900
Glacier County3003513,463$165,100
Golden Valley County30037844$212,200
Granite County300393,658$352,700
Hill County3004116,167$202,600
Jefferson County3004313,329$446,900
Judith Basin County300452,162$238,300
Lake County3004733,392$421,800
Lewis and Clark County3004975,331$393,500
Liberty County300511,957$169,100
Lincoln County3005322,328$296,500
McCone County300551,720$211,600
Madison County3005710,026$470,100
Meagher County300592,137$259,800
Mineral County300615,185$364,300
Missoula County30063123,513$472,100
Musselshell County300655,582$235,000
Park County3006718,214$467,500
Petroleum County30069548$201,400
Phillips County300714,203$197,600
Pondera County300736,072$206,100
Powder River County300751,781$192,100
Powell County300777,157$306,500
Prairie County300791,112$165,700
Ravalli County3008148,582$476,600
Richland County3008311,377$263,000
Roosevelt County3008510,242$118,800
Rosebud County300878,253$182,400
Sanders County3008914,062$359,000
Sheridan County300913,436$124,000
Silver Bow County3009336,118$255,200
Stillwater County300959,445$405,800
Sweet Grass County300973,762$330,100
Teton County300996,496$264,000
Toole County301015,211$218,400
Treasure County30103728$230,300
Valley County301057,385$198,400
Wheatland County301072,100$180,800
Wibaux County30109885$98,600
Yellowstone County30111172,692$349,500