• county
  • FIPS 19119
  • Largest town: Rock Rapids

Lyon County, Iowa

Lyon County had 12,378 residents in the Census Vintage 2024 estimate, on 587.6 square miles of land. It ranks 61st of 99 in Iowa by population and 25th by land area.

Population
12,378
#61 of 99 in Iowa · #2,263 in US
Area
587.6 sq mi
#25 of 99 in Iowa · #1,667 in US
Density
21 / sq mi
#69 of 99 in Iowa · #2,207 in US
Median household income
$74,790
#23 of 99 in Iowa · #680 in US

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

Lyon County within Iowa. Pin: Des Moines.

Measure from here

Tools and pages that start from Lyon County

Lyon County population, land area and income

Lyon County had 12,378 residents in the Census Vintage 2024 estimate, on 587.6 square miles of land. It ranks 61st of 99 in Iowa by population and 25th by land area. That works out to 21.1 people per square mile, below the US average of 96.3, and below the national county median.

The median county-equivalent in Iowa has 15,008 residents; Lyon County is somewhat smaller.

Its SAIPE 2023 median household income of $74,790 is in the top quarter among 3,143 counties with an estimate.

National rank among 3,144

Population

12,378

3144th1st

2263rd of 3,144 (US)

Land area

588 sq mi

3144th1st

1667th of 3,144 (US)

Density

21.1 / sq mi

3144th1st

2207th of 3,144 (US)

Median household income

$74,790

3143rd1st

680th of 3,143 (US)

Rank within Iowa (99)

Population

12,378

99th1st

61st of 99 (IA)

Land area

588 sq mi

99th1st

25th of 99 (IA)

Density

21.1 / sq mi

99th1st

69th of 99 (IA)

Median household income

$74,790

99th1st

23rd of 99 (IA)

How Lyon County's population changed since 2020

Lyon County gained 455 residents between the July 2020 and July 2024 estimates, a rise of 3.8%. That ranks 6th of 99 in Iowa for growth. The median Iowa county changed by -0.6%, and the state as a whole by +1.6%.

Since the April 2020 estimates base, Lyon County recorded 646 births and 482 deaths, a natural change of +164. Net international migration added +103 and net domestic migration, people moving to or from other US counties, came to +185. The largest single component was domestic migration, which added 185 people.

11.9k202012.0k202112.2k202212.3k202312.4k2024
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
646
Deaths
482
Net international migration
+103
Net domestic migration
+185
Change, July 2023 to July 2024
+90

Where Lyon County is

The Census internal point of Lyon County is at 43.383600, -96.207200. It sits in UTM zone 14N. The map shades Iowa's 99 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Lyon County outlined. Dots are towns of 1,000+ people with residents in it.

Monroe County: -2.9%Worth County: -1.7%Buena Vista County: +0.0%Jasper County: +0.8%Van Buren County: -0.0%Hardin County: -2.2%Ida County: -3.1%Marshall County: +0.8%Fayette County: -1.5%Ringgold County: -0.8%Wapello County: +1.0%Webster County: -0.2%Adams County: -2.8%Buchanan County: +0.6%Cerro Gordo County: -1.2%Lucas County: +1.6%Emmet County: -1.9%Floyd County: -3.8%Crawford County: -0.7%Linn County: +0.6%Montgomery County: -2.6%Polk County: +4.7%Cherokee County: +0.0%Bremer County: +1.3%Grundy County: +0.5%Adair County: -0.8%Cedar County: -1.4%Story County: +3.9%Mahaska County: -0.6%Davis County: +0.9%Clay County: +0.8%Johnson County: +4.6%Greene County: -1.0%Palo Alto County: -2.0%Benton County: +1.0%Cass County: -0.7%Wright County: -1.5%Audubon County: -2.1%Henry County: -5.3%Boone County: +0.1%Appanoose County: -1.4%Washington County: +0.4%Chickasaw County: -2.2%Poweshiek County: -0.9%Osceola County: -2.6%Wayne County: +1.8%Mitchell County: +0.4%Jefferson County: +0.5%Union County: -1.4%Butler County: -1.2%Hancock County: -1.3%Marion County: +1.9%Delaware County: +0.9%Humboldt County: +0.2%Sioux County: +1.8%Des Moines County: -1.1%O'Brien County: +0.8%Clayton County: -0.6%Black Hawk County: +1.0%Winnebago County: -2.6%Harrison County: +0.4%Decatur County: -1.0%Pocahontas County: -0.9%Lyon County: +3.8%Iowa County: -1.4%Franklin County: +0.3%Dickinson County: +2.2%Madison County: +3.2%Allamakee County: +0.8%Jones County: +2.2%Carroll County: -1.6%Kossuth County: -2.6%Hamilton County: -1.0%Howard County: -1.4%Page County: -1.1%Guthrie County: +1.5%Tama County: -1.8%Monona County: -3.6%Clarke County: -2.1%Lee County: -3.4%Mills County: +2.1%Sac County: -2.7%Scott County: +0.6%Keokuk County: -1.6%Jackson County: -0.3%Warren County: +7.1%Calhoun County: -1.9%Shelby County: +0.8%Fremont County: -1.1%Dubuque County: -0.1%Louisa County: -1.8%Taylor County: -0.6%Woodbury County: +1.2%Clinton County: -0.9%Winneshiek County: -1.6%Pottawattamie County: -0.1%Plymouth County: +0.5%Muscatine County: -2.4%Dallas County: +14.7%
Change 2020 to 2024
  1. < -1.9%
  2. < -1.0%
  3. < +0.0%
  4. < +0.9%
  5. ≥ +0.9%
no data

Orange pin: Lyon County internal point. Dark pin: Des Moines.

Internal point

Decimal
43.383600, -96.207200
DMS
43°23'0.96"N 96°12'25.92"W
UTM
14N 726220.5E 4807202.9N
Geohash
9zewfc8pc
Plus code
86M59QMV+C4

Towns in Lyon County

2 incorporated places of 1,000+ people have residents in Lyon County, 3,815 people together, or 31% of the county. Each figure counts only the part of the town inside Lyon County; towns marked "part" extend into another county. The largest is Rock Rapids with 2,709.

  1. 01Rock Rapids2,709
  2. 02George1,106
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Lyon County

The Census 2024 county adjacency file lists 7 neighbors for Lyon County, including 4 across a state line. The most populous is Minnehaha County, SD, with 208,639 residents. Distances run between Census internal points in a straight line.

Distance to Des Moines and the nearest big city

Des Moines is 181.5 miles SE of Lyon County's internal point in a straight line. The nearest place of 100,000 or more is Sioux Falls, SD (population 209,289), 28.5 miles away. The nearest place of 10,000 or more is Brandon, SD (population 10,837), 23.8 miles away.

Lyon County FIPS code

The FIPS code of Lyon County is 19119: state code 19 for Iowa plus county code 119. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $74,790.

Questions people ask

What is the population of Lyon County, Iowa?

The Census Vintage 2024 estimate for July 1, 2024 is 12,378. That is up 455 people (3.8%) from the July 2020 estimate of 11,923.

What is the FIPS code of Lyon County?

19119. The first two digits (19) are Iowa; the last three (119) identify the county.

What is the largest town in Lyon County?

Rock Rapids, with 2,709 residents inside Lyon County in 2024.

Which counties border Lyon County?

7 county-equivalents border it in the Census 2024 adjacency file: Minnehaha County, SD; Lincoln County, SD; Sioux County, IA; Nobles County, MN; O'Brien County, IA; Rock County, MN; Osceola County, IA.

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.