Lyon County GIS Maps
Lyon County, Iowa, has 11,934 residents across 10,305 parcels and covers 587.7 square miles. The population grew 3% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for Lyon County is 19119.
Rock Rapids is the county's largest population center. Lyon County also includes 8 zip codes, 6 public school districts and 37 municipalities. Those boundaries help explain why population, schools, and housing can look different from one part of the county to another. The map below shows how those county lines, zip codes, and school districts fit together, and the sections that follow use that same geography to show parcel data, population, demographics, school enrollment and housing patterns in more detail.
Maps, GIS layers, Parcels and sample data. Paid packages add full layers, analytics and database files.
Lyon County Trends
- Population
- 11,934▴
- Median Home Value
- $215,600▴
- K-12 Enrollment
- 4,795▾
County analytics dashboards with historical trends & projections included in package downloads.
Free starter access previews county maps, lightweight GIS, and sample data. Paid packages unlock full GIS layers, analytics, and database files.
Lyon County Maps
The maps below show a few of the county map styles included in our downloads. County packages include map exports in JPEG, PNG, SVG, PDF and GeoTIFF formats plus more than 20 GIS layers for mapping, research and analysis. Available layers include zip codes, area codes, subdivisions, school districts, political boundaries, roads, water features, points of interest and more.
County packages also include historical county demographics, business intelligence, analytical dashboards, AI-ready prompts, markdown files and related reference data. Everything is organized to save hours of manual work collecting current data, cleaning it and joining it together. That makes it easier to move faster on analytics, due diligence, business planning and location research. Paid packages are built for commercial use, but some package contents include source-specific attribution or notice guidance. Review Licensing & Data Source Notices.
Lyon County Parcels
Lyon County has 10,305 mapped parcels covering 352,210 acres. The median assessed value is $172,390. The median lot size is 55.00 acres. 4,327 parcels are 10 acres or larger. The records carry 6,113 distinct owner names. Owner names and assessed values are on nearly every parcel. Site addresses reach 57.8%. Lot sizes reach 54.0%. Browse the interactive Lyon County Parcel viewer here.
Lyon County Parcel Data Coverage
| Field | Parcels | Coverage |
|---|---|---|
| Parcel ID | 10,305 | 100% |
| Owner name | 10,237 | 99.3% |
| Owner mailing address | 0 | 0% |
| Site address | 5,959 | 57.8% |
| Land use code | 0 | 0% |
| Land use description | 0 | 0% |
| Assessed value | 10,224 | 99.2% |
| Land value | 0 | 0% |
| Improvement value | 0 | 0% |
| Acreage | 5,569 | 54.0% |
| Parcel boundary | 10,305 | 100% |
| Download all Lyon County parcels. | ||
Field coverage measured across all Lyon County parcel records.
Lyon County Population
Lyon County had 11,934 residents in 2020. That was 3% higher than in 2010. Lyon County added 171 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 20 people per square mile. Some of the county's most populated postal areas include Rock Rapids, Larchwood and Inwood.
Population Trend in Lyon County IA
Lyon County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Lyon County Zip Codes
Lyon County has 8 zip codes. Some of the county's most populated zip codes include Rock Rapids (51246), Larchwood (51241) and Inwood (51240). Rock Rapids is the largest zip by population, with about 3,834 residents or 32% of the county total. Together, the three largest zips account for about 63% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Lyon County IA
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 51246 | Rock Rapids | 3,834 | ▾ -0.3% |
| 51241 | Larchwood | 1,916 | ▴ 10.3% |
| 51240 | Inwood | 1,816 | ▴ 4% |
| 51237 | George | 1,654 | ▾ -2.9% |
| 51235 | Doon | 1,122 | ▴ 4% |
| Download all zip code data | |||
Lyon County Zip Code populations and trends per most recent census data.
Lyon County Demographics
Lyon County has a median age of 38.1, which makes the county a little younger than Iowa overall. About 28.6% of residents are under 18, while 18.9% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is Under 18 at about 28.6% of the population, which suggests the county has a notable share of children and family households. About 20.8% of adults have a bachelor's degree or higher, above the statewide figure of 30.9%. The county is mostly White by population, though Hispanic, Asian, Black and multiracial residents are also part of the local mix.
Key Demographics for Lyon County IA
Median Age
38.1
Under 18
28.6%
Age 65+
18.9%
Bachelor's+
20.8%
Lyon County School Districts
Lyon County is served by 6 public school districts with 4,795 students enrolled in 2024. The largest districts on the county map are Sheldon Community, West Lyon Community and Rock Valley Community. Those three districts account for about 63% of public school enrollment in the map area. Total enrollment has stayed fairly steady in recent years, based on district totals from 2017 to 2024.
Largest School Districts by Enrollment in Lyon County IA
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Sheldon Community School District | 1,179 | 24.6% | ▴ 1.6% |
| West Lyon Community School District | 973 | 20.3% | ▴ 0.1% |
| Rock Valley Community School District | 884 | 18.4% | ▾ -5.5% |
| Central Lyon Community School District | 789 | 16.5% | ▾ -0.6% |
| Boyden-Hull Community School District | 575 | 12% | ▾ -3.2% |
| Download all school district data | |||
Lyon County school district enrollment and trends per most recent NCES reporting data.
Lyon County Housing & Real Estate
Lyon County has a median home value of $215,600 and a median gross rent of $802. About 83% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run above the Iowa median, while rents come in below the state average. In March 2026, the median listing price was $299,175 and homes spent about 109 days on the market.
Lyon County Housing Mix
Lyon County housing mix: owner, renter and vacant units.
Lyon County Housing Trends
Lyon County median home value and rent trend (last 5 years).
Businesses in Lyon County, IA
Lyon County has 566 business listings across 234 categories. The largest categories in Lyon County business listings are Churches & Religious Organizations (33, 5.8%), Auto Repair (17, 3.0%), and Gas Stations (11, 1.9%). The full Lyon County business listings dataset includes names, categories, addresses and contact details where available. Lyon County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Lyon County, IA
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 33 | 5.8% |
| Auto Repair | 17 | 3.0% |
| Gas Stations | 11 | 1.9% |
| Agricultural Service | 11 | 1.9% |
| Parks & Recreation | 11 | 1.9% |
| Banks & Credit Unions | 11 | 1.9% |
| Farm | 11 | 1.9% |
| Public And Government Association | 9 | 1.6% |
| Shipping Center | 8 | 1.4% |
| Hair Salons | 7 | 1.2% |
Lyon County Business Listings
| Business | Category | City |
|---|---|---|
| De Noble, Austin & Company PC | Accountant | Rock Rapids |
| Rock River Golf and Country Club | Active Life | Rock Rapids |
| Keep It Local | Advertising Agency | Inwood |
| Hog Slat, Inc. | Agricultural Service | Rock Rapids |
| Icon Ag & Turf | Agriculture Association | Doon |
| Rock Rapids Municipal Airport | Airport | Rock Rapids |
| Larchwood Emergency Medical Services | Ambulance And Ems Services | Larchwood |
| JJ's Drive In | American Restaurants | Rock Rapids |
| Inwood Trading Post | Antique Store | Inwood |
| Lvo Manufacturing | Appliance Manufacturer | Rock Rapids |
| Download Lyon County business listings | ||
Lyon County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Lyon County Basemaps
Lyon County map and data packages include a set of useful basemaps to help you get started quickly. These include a custom light grey canvas, USGS topo, imagery and other reference layers that make it easier to build clear, meaningful county maps using the included GIS layers, your own data or both. Pre-rendered map tiles for the light grey basemap are included so you can use them offline or host them on your own CDN.
Get the Full Lyon County Data Package
This page shows a preview of what's included in the Lyon County data package. The full package gives you a ready-to-use county data system with GIS layers, historical data, maps, database files and planning tools that save hours of manual data gathering, cleanup and joins. Everything is organized to help you skip data wrangling and start analysis faster.
- 20+ GIS layers for parcels, zip codes, school districts, roads, water, boundaries and more
- Historical county demographics, housing, income and trend data
- ZIP code population files and school district enrollment history
- Database files, markdowns, AI-ready prompts and documentation
- Map exports in PNG, JPEG, PDF, SVG and GeoTIFF formats
- Offline-ready data explorer, map and analytics tools
Paid packages support commercial use, client work, and derived outputs. Some package contents may include source-specific attribution or provider notices. See Licensing & Data Source Notices.
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Nearby Counties
Browse county data pages for the counties that border Lyon County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.