Marshall County GIS Maps
Marshall County, Iowa, has 40,105 residents and covers 572.5 square miles. The population declined 1.3% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Marshall County is 19127.
Marshalltown is the county's largest population center. Marshall County also includes 13 zip codes, 9 public school districts and 32 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 population, demographics, school enrollment and housing patterns in more detail.
Maps, GIS layers and sample data. Paid packages add full layers, analytics and database files.
Marshall County Trends
- Population
- 40,105▾
- Median Home Value
- $134,100▴
- K-12 Enrollment
- 9,280▾
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.
Marshall 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.
Marshall County Population
Marshall County had 40,105 residents in 2020. That was 1.3% lower than in 2010. Marshall County added 794 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 70 people per square mile. Some of the county's most populated postal areas include Marshalltown, State Center and Melbourne.
Population Trend in Marshall County IA
Marshall County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Marshall County Zip Codes
Marshall County has 13 zip codes. Some of the county's most populated zip codes include Marshalltown (50158), State Center (50247) and Melbourne (50162). Marshalltown is the largest zip by population, with about 31,466 residents or 78% of the county total. Together, the three largest zips account for about 87% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Marshall County IA
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 50158 | Marshalltown | 31,466 | ▾ -0.4% |
| 50247 | State Center | 2,365 | ▾ -6% |
| 50162 | Melbourne | 1,236 | ▴ 0.2% |
| 50106 | Gilman | 1,044 | ▴ 0.5% |
| 50142 | Le Grand | 905 | ▾ -2.8% |
| Download all zip code data | |||
Marshall County Zip Code populations and trends per most recent census data.
Marshall County Demographics
Marshall County has a median age of 38.7, which is close to the Iowa average. About 25.3% of residents are under 18, while 18.5% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 25 to 44 at about 29.1% of the population, which points to a solid working-age base. About 21.4% of adults have a bachelor's degree or higher, above the statewide figure of 30.9%. The county is majority White by population, with Hispanic, Asian, Black and multiracial residents making up a meaningful share of the local mix.
Key Demographics for Marshall County IA
Median Age
38.7
Under 18
25.3%
Age 65+
18.5%
Bachelor's+
21.4%
Marshall County School Districts
Marshall County is served by 9 public school districts with 9,280 students enrolled in 2024. The largest districts on the county map are Marshalltown Community, West Marshall Community and East Marshall Community. Those three districts account for about 71% of public school enrollment in the map area. Total enrollment has stayed fairly steady in recent years, but it is slightly lower than it was in 2017.
Largest School Districts by Enrollment in Marshall County IA
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Marshalltown Community School District | 5,099 | 54.9% | ▴ 0.4% |
| West Marshall Community School District | 917 | 9.9% | ▾ -2% |
| East Marshall Community School District | 616 | 6.6% | ▾ -8.3% |
| Gladbrook-Reinbeck Community School District | 480 | 5.2% | ▴ 2.8% |
| GMG Community School District | 476 | 5.1% | ▴ 0.8% |
| Download all school district data | |||
Marshall County school district enrollment and trends per most recent NCES reporting data.
Marshall County Housing & Real Estate
Marshall County has a median home value of $134,100 and a median gross rent of $860. About 73% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the Iowa median, while rents come in below the state average. In March 2026, the median listing price was $171,800 and homes spent about 62 days on the market.
Marshall County Housing Mix
Marshall County housing mix: owner, renter and vacant units.
Marshall County Housing Trends
Marshall County median home value and rent trend (last 5 years).
Businesses in Marshall County, IA
Marshall County has 1,586 business listings across 427 categories. The largest categories in Marshall County business listings are Churches & Religious Organizations (63, 4.0%), Medical Offices (37, 2.3%), and Parks & Recreation (28, 1.8%). The full Marshall County business listings dataset includes names, categories, addresses and contact details where available. Marshall County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Marshall County, IA
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 63 | 4.0% |
| Medical Offices | 37 | 2.3% |
| Parks & Recreation | 28 | 1.8% |
| Auto Repair | 28 | 1.8% |
| Contractors | 26 | 1.6% |
| Convenience Stores | 23 | 1.5% |
| Beauty Salons | 22 | 1.4% |
| Landmark And Historical Building | 20 | 1.3% |
| Banks & Credit Unions | 18 | 1.1% |
| Community & Nonprofits | 18 | 1.1% |
Marshall County Business Listings
| Business | Category | City |
|---|---|---|
| Wanatee Accounting Services | Accountant | Marshalltown |
| Marshalltown Parks & Rec | Active Life | Marshalltown |
| Alcoholics Anonymous | Addiction Rehabilitation Center | Marshalltown |
| Adult Shop | Adult Entertainment | Marshalltown |
| Kdao Radio-99.5 Fm-1190 AM | Advertising Agency | Marshalltown |
| Cessford Construction Company, a CRH Company | Aggregate Supplier | Le Grand |
| Marshall County Farm Bureau | Agricultural Cooperatives | Marshalltown |
| Central Iowa Farm Store | Agricultural Service | Marshalltown |
| Mid-Iowa Cooperative Liscomb | Agriculture | Liscomb |
| AG Design | Agriculture Association | State Center |
| Download Marshall County business listings | ||
Marshall County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Marshall County Basemaps
Marshall 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 Marshall County Data Package
This page shows a preview of what's included in the Marshall 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 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 Marshall County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.