County facts · Population · October 25, 2026

Wyoming Population by County, 2025 Census Estimates

Wyoming population by county: July 2025 Census estimates for all 23 counties, change since 2020, density, and a link to each official parcel map.

Looking for Wyoming population by county? The Census Bureau estimates that Wyoming had 588,753 residents on July 1, 2025, spread across 23 counties. Laramie County is the most populous, with 102,938 people (17% of the state), and Niobrara County is the least populous, with 2,341.

The table below lists every county with its 2025 estimate, its April 2020 starting point, the change, people per square mile, and a link to its official parcel viewer.

Wyoming population at a glance

Counties: 23
Statewide, July 1, 2025: 588,753 (April 1, 2020 estimates base: 576,872; change +11,881, +2.1%)
Most populous: Laramie County (102,938); least populous: Niobrara County (2,341)
Median county: about 14,013 residents (half of the counties are smaller)
The 5 largest counties hold 53% of all Wyoming residents
Counties with 1,000,000+ residents: 0 · 100,000+: 1 · under 10,000: 8
Statewide density: about 6.1 people per square mile of land

Wyoming population by county, July 2025 (all 23)

#	County	Jul 2025	Apr 2020	% change	People per sq mi	Parcel viewer
1	Laramie County	102,938	100,511	+2.4%	38	TerraGIS
2	Natrona County	80,526	79,965	+0.7%	15	ArcGIS Experience Builder
3	Campbell County	48,145	47,028	+2.4%	10	Beacon (Schneider Geospatial)
4	Sweetwater County	41,267	42,268	−2.4%	4.0	TerraGIS
5	Fremont County	39,464	39,234	+0.6%	4.3	Beacon (Schneider Geospatial)
6	Albany County	38,558	37,068	+4.0%	9.0	TerraGIS
7	Sheridan County	33,241	30,923	+7.5%	13	TerraGIS
8	Park County	31,171	29,629	+5.2%	4.5	TerraGIS
9	Teton County	23,333	23,330	+0.0%	5.8	TerraGIS
10	Lincoln County	21,180	19,578	+8.2%	5.2	county web map
11	Uinta County	20,728	20,450	+1.4%	10.0	TerraGIS
12	Carbon County	14,013	14,533	−3.6%	1.8	TerraGIS
13	Converse County	13,824	13,753	+0.5%	3.2	TerraGIS
14	Goshen County	12,640	12,508	+1.1%	5.7	Beacon (Schneider Geospatial)
15	Big Horn County	12,024	11,519	+4.4%	3.8	TerraGIS
16	Sublette County	8,929	8,730	+2.3%	1.8	TerraGIS
17	Johnson County	8,908	8,452	+5.4%	2.1	TerraGIS
18	Platte County	8,634	8,602	+0.4%	4.1	TerraGIS
19	Crook County	7,852	7,182	+9.3%	2.8	ArcGIS Experience Builder
20	Washakie County	7,597	7,681	−1.1%	3.4	Beacon (Schneider Geospatial)
21	Weston County	6,840	6,841	−0.0%	2.9	ArcGIS Web AppBuilder
22	Hot Springs County	4,600	4,619	−0.4%	2.3	TerraGIS
23	Niobrara County	2,341	2,468	−5.1%	0.9	ArcGIS Web AppBuilder

Percent change runs from the April 1, 2020 estimates base to July 1, 2025. People per square mile is the July 2025 estimate divided by the county's land area in the Census Bureau's 2020 Gazetteer file, so lakes and bays are left out.

How Wyoming's population is spread out

Grouping the counties by size shows how concentrated the state is:

Residents (July 2025)	Counties	Total residents	Share of state
100,000 to 249,999	1	102,938	17%
25,000 to 99,999	7	312,372	53%
10,000 to 24,999	7	117,742	20%
Under 10,000	8	55,701	9%

Most and least densely populated

The most crowded counties by people per square mile of land:

Laramie County: 38 per sq mi (102,938 people on 2,686 sq mi)
Natrona County: 15 per sq mi (80,526 people on 5,341 sq mi)
Sheridan County: 13 per sq mi (33,241 people on 2,523 sq mi)
Campbell County: 10 per sq mi (48,145 people on 4,802 sq mi)
Uinta County: 10.0 per sq mi (20,728 people on 2,082 sq mi)

The most thinly settled:

Niobrara County: 0.9 per sq mi (2,341 people on 2,626 sq mi)
Carbon County: 1.8 per sq mi (14,013 people on 7,898 sq mi)
Sublette County: 1.8 per sq mi (8,929 people on 4,886 sq mi)
Johnson County: 2.1 per sq mi (8,908 people on 4,154 sq mi)
Hot Springs County: 2.3 per sq mi (4,600 people on 2,004 sq mi)

About these numbers

They are estimates. Between censuses the Census Bureau's Population Estimates Program updates county totals each year from births, deaths and migration records. The next full count is the 2030 census.
The base is April 1, 2020. The estimates start from an April 1, 2020 "estimates base" built from the 2020 census, which is why it is slightly different from the published census count.
Each new release revises the past. A newer vintage can change earlier years as well, so compare numbers from the same release, as this page does.
Statewide total. The counties add up exactly to the statewide figure of 588,753 in the same file.

Using population numbers in a land search

Big counties, busy offices. In the most populous counties, parcel maps and deed records are usually online and searchable, but recording and permit offices are busier. Allow for that if you are on a deadline.
Small counties, fewer sales. In counties with only a few thousand people, land changes hands less often, so there are fewer recent sales to compare a price with. Recorded deeds and the local assessor's sales records are the best source.
Density hints at lot size. A low people-per-square-mile figure usually means farms, ranches and timber tracts; a high one means subdivided lots. The parcel viewer shows the actual parcel lines.
Check the official map. Use the parcel viewer link in the table for boundaries, parcel numbers and owner names, then confirm anything important with the local assessor and the office that records deeds.

Sources

U.S. Census Bureau, Population Estimates Program, county totals, Vintage 2025 (April 1, 2020 estimates base and July 1, 2020–2025 estimates, with components of change). Statewide totals are the sum of the counties and match the file's state row.
U.S. Census Bureau Gazetteer files, 2020 county land and water area (for people per square mile).
Platbookmapper county GIS directory (live data file behind our county pages, pulled October 25, 2026) for each official parcel viewer.