• county
  • FIPS 55109
  • Largest town: Hudson

St. Croix County, Wisconsin

St. Croix County had 97,954 residents in the Census Vintage 2024 estimate, on 722.2 square miles of land. It ranks 17th of 72 in Wisconsin by population and 39th by land area.

Population
97,954
#17 of 72 in Wisconsin · #632 in US
Area
722.2 sq mi
#39 of 72 in Wisconsin · #1,237 in US
Density
136 / sq mi
#20 of 72 in Wisconsin · #743 in US
Median household income
$103,731
#1 of 72 in Wisconsin · #100 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

St. Croix County within Wisconsin. Pin: Madison.

Measure from here

Tools and pages that start from St. Croix County

St. Croix County population, land area and income

St. Croix County had 97,954 residents in the Census Vintage 2024 estimate, on 722.2 square miles of land. It ranks 17th of 72 in Wisconsin by population and 39th by land area. That works out to 135.6 people per square mile, 1.4 times the US average of 96.3, and in the top quarter nationally.

The median county-equivalent in Wisconsin has 41,821 residents, so St. Croix County is 2.3 times that size.

Its SAIPE 2023 median household income of $103,731 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

97,954

3144th1st

632nd of 3,144 (US)

Land area

722 sq mi

3144th1st

1237th of 3,144 (US)

Density

135.6 / sq mi

3144th1st

743rd of 3,144 (US)

Median household income

$103,731

3143rd1st

100th of 3,143 (US)

Rank within Wisconsin (72)

Population

97,954

72nd1st

17th of 72 (WI)

Land area

722 sq mi

72nd1st

39th of 72 (WI)

Density

135.6 / sq mi

72nd1st

20th of 72 (WI)

Median household income

$103,731

72nd1st

1st of 72 (WI)

How St. Croix County's population changed since 2020

St. Croix County gained 4,061 residents between the July 2020 and July 2024 estimates, a rise of 4.3%. That ranks 2nd of 72 in Wisconsin for growth. The median Wisconsin county changed by +1.0%, and the state as a whole by +1.1%.

Since the April 2020 estimates base, St. Croix County recorded 4,440 births and 3,249 deaths, a natural change of +1,191. Net international migration added +375 and net domestic migration, people moving to or from other US counties, came to +2,839. The largest single component was domestic migration, which added 2,839 people.

93.9k202095.0k202196.1k202297.2k202398.0k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
4,440
Deaths
3,249
Net international migration
+375
Net domestic migration
+2,839
Change, July 2023 to July 2024
+798

Where St. Croix County is

The Census internal point of St. Croix County is at 45.029000, -92.447300. It sits in UTM zone 15N. The map shades Wisconsin's 72 county-equivalents by population change from 2020 to 2024, darker for faster growth, with St. Croix County outlined. Dots are towns of 1,000+ people with residents in it.

Barron County: +0.2%Green County: +0.4%Dunn County: +1.5%Jefferson County: +0.0%Lincoln County: +0.1%Rusk County: -0.1%Fond du Lac County: +0.1%Marquette County: +1.0%Outagamie County: +2.3%Waupaca County: -1.2%Oneida County: +0.8%Eau Claire County: +2.8%Washington County: +1.4%Portage County: +2.3%Menominee County: +0.7%Clark County: +0.5%Monroe County: +0.2%Milwaukee County: -1.5%Buffalo County: +1.1%Lafayette County: +4.2%Ozaukee County: +2.5%Rock County: +1.0%Sheboygan County: +0.2%Green Lake County: +1.8%Waukesha County: +2.3%Calumet County: +2.1%Dodge County: -0.8%Wood County: -0.3%Winnebago County: +0.9%Sawyer County: +4.0%Dane County: +4.6%Sauk County: +1.1%Pepin County: +2.9%Adams County: +3.2%Price County: +0.4%Taylor County: +1.1%Grant County: +0.7%Trempealeau County: -0.0%Vernon County: +2.1%Waushara County: +2.2%Iowa County: +1.0%Crawford County: -0.5%Kenosha County: -0.3%Shawano County: +1.1%Juneau County: -0.7%Jackson County: -0.3%Vilas County: +3.7%Bayfield County: +3.7%Chippewa County: +1.5%Iron County: +1.5%Racine County: +0.3%Door County: +1.3%Ashland County: +1.1%Kewaunee County: +0.9%Polk County: +1.8%Florence County: +2.4%Douglas County: -0.2%Forest County: +3.7%Columbia County: -0.7%Walworth County: +0.7%La Crosse County: +0.1%Manitowoc County: +0.1%Oconto County: +2.5%Langlade County: +0.4%Marathon County: +0.7%Washburn County: +2.2%Brown County: +1.8%Richland County: -0.9%Marinette County: +1.1%St. Croix County: +4.3%Pierce County: +2.7%Burnett County: +3.7%
Change 2020 to 2024
  1. < +0.1%
  2. < +0.7%
  3. < +1.3%
  4. < +2.3%
  5. ≥ +2.3%
no data

Orange pin: St. Croix County internal point. Dark pin: Madison.

Internal point

Decimal
45.029000, -92.447300
DMS
45°01'44.40"N 92°26'50.28"W
UTM
15N 543539.2E 4986320.5N
Geohash
cbn20m3bv
Plus code
86Q92HH3+J3

Towns in St. Croix County

11 incorporated places of 1,000+ people have residents in St. Croix County, 49,500 people together, or 51% of the county. Each figure counts only the part of the town inside St. Croix County; towns marked "part" extend into another county. The largest is Hudson with 15,031.

  1. 01Hudson15,031
  2. 02New Richmond10,879
  3. 03River Falls (part)4,995
  4. 04Baldwin4,352
  5. 05North Hudson3,819
  6. 06Somerset3,382
  7. 07Roberts2,476
  8. 08Hammond1,881
  9. 09Woodville1,401
  10. 10Glenwood City1,267
  11. 11Spring Valley (part)17
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering St. Croix County

The Census 2024 county adjacency file lists 5 neighbors for St. Croix County, including 1 across a state line. The most populous is Washington County, MN, with 283,960 residents. Distances run between Census internal points in a straight line.

Distance to Madison and the nearest big city

Madison is 203.4 miles SE of St. Croix County's internal point in a straight line. The nearest place of 100,000 or more is St. Paul, MN (population 307,465), 32.6 miles away. The nearest place of 10,000 or more is New Richmond, WI (population 10,879), 8.3 miles away.

St. Croix County FIPS code

The FIPS code of St. Croix County is 55109: state code 55 for Wisconsin plus county code 109. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $103,731.

Questions people ask

What is the population of St. Croix County, Wisconsin?

The Census Vintage 2024 estimate for July 1, 2024 is 97,954. That is up 4,061 people (4.3%) from the July 2020 estimate of 93,893.

What is the FIPS code of St. Croix County?

55109. The first two digits (55) are Wisconsin; the last three (109) identify the county.

What is the largest town in St. Croix County?

Hudson, with 15,031 residents inside St. Croix County in 2024.

Which counties border St. Croix County?

5 county-equivalents border it in the Census 2024 adjacency file: Washington County, MN; Barron County, WI; Dunn County, WI; Polk County, WI; Pierce County, WI.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.