Grundy County GIS Maps
Grundy County, Iowa, has 12,329 residents across 10,530 parcels and covers 501.9 square miles. The population declined 1% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Grundy County is 19075.
Grundy Center is the county's largest population center. Grundy County also includes 9 zip codes, 7 public school districts and 30 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.
Grundy County Trends
- Population
- 12,329▾
- Median Home Value
- $180,500▴
- K-12 Enrollment
- 4,586▾
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.
Grundy 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.
Grundy County Parcels
Grundy County has 10,530 mapped parcels covering 311,110 acres. The median assessed value is $177,540. The median lot size is 2.89 acres. 4,022 parcels are 10 acres or larger. The records carry 6,909 distinct owner names. Owner names and assessed values are on nearly every parcel. Site addresses reach 59.8%. Lot sizes reach 97.1%. Browse the interactive Grundy County Parcel viewer here.
Grundy County Parcel Data Coverage
| Field | Parcels | Coverage |
|---|---|---|
| Parcel ID | 10,530 | 100% |
| Owner name | 10,523 | 99.9% |
| Owner mailing address | 0 | 0% |
| Site address | 6,295 | 59.8% |
| Land use code | 0 | 0% |
| Land use description | 0 | 0% |
| Assessed value | 10,516 | 99.9% |
| Land value | 0 | 0% |
| Improvement value | 0 | 0% |
| Acreage | 10,226 | 97.1% |
| Parcel boundary | 10,530 | 100% |
| Download all Grundy County parcels. | ||
Field coverage measured across all Grundy County parcel records.
Grundy County Population
Grundy County had 12,329 residents in 2020. That was 1% lower than in 2010. Grundy County had 40 fewer people in 2020 than it did in 2000, which points to a long-term population decline. The county is fairly spread out, with about 25 people per square mile. Some of the county's most populated postal areas include Grundy Center, Reinbeck and Dike.
Population Trend in Grundy County IA
Grundy County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Grundy County Zip Codes
Grundy County has 9 zip codes. Some of the county's most populated zip codes include Grundy Center (50638), Reinbeck (50669) and Dike (50624). Grundy Center is the largest zip by population, with about 3,411 residents or 28% of the county total. Together, the three largest zips account for about 61% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Grundy County IA
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 50638 | Grundy Center | 3,411 | ▴ 3% |
| 50669 | Reinbeck | 2,335 | ▾ -4.1% |
| 50624 | Dike | 1,835 | ▴ 5.3% |
| 50621 | Conrad | 1,450 | ▾ -5.2% |
| 50680 | Wellsburg | 1,128 | ▴ 3% |
| Download all zip code data | |||
Grundy County Zip Code populations and trends per most recent census data.
Grundy County Demographics
Grundy County has a median age of 41.5, which makes the county a little older than Iowa overall. About 23.6% of residents are under 18, while 20.8% 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 28.7% of the population, which points to a solid working-age base. About 24.7% 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 Grundy County IA
Median Age
41.5
Under 18
23.6%
Age 65+
20.8%
Bachelor's+
24.7%
Grundy County School Districts
Grundy County is served by 7 public school districts with 4,586 students enrolled in 2024. The largest districts on the county map are Dike-New Hartford Community, Aplington-Parkersburg Community and Grundy Center Community. Those three districts account for about 55% 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 Grundy County IA
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Dike-New Hartford Community School District | 957 | 20.9% | — 0% |
| Aplington-Parkersburg Community School District | 821 | 17.9% | ▾ -0.4% |
| Grundy Center Community School District | 743 | 16.2% | ▴ 0.1% |
| AGWSR Community School District | 642 | 14% | ▾ -0.2% |
| Gladbrook-Reinbeck Community School District | 480 | 10.5% | ▴ 2.8% |
| Download all school district data | |||
Grundy County school district enrollment and trends per most recent NCES reporting data.
Grundy County Housing & Real Estate
Grundy County has a median home value of $180,500 and a median gross rent of $777. About 84% 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 $248,725 and homes spent about 72 days on the market.
Grundy County Housing Mix
Grundy County housing mix: owner, renter and vacant units.
Grundy County Housing Trends
Grundy County median home value and rent trend (last 5 years).
Businesses in Grundy County, IA
Grundy County has 596 business listings across 228 categories. The largest categories in Grundy County business listings are Churches & Religious Organizations (34, 5.7%), Medical Offices (19, 3.2%), and Contractors (14, 2.3%). The full Grundy County business listings dataset includes names, categories, addresses and contact details where available. Grundy County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Grundy County, IA
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 34 | 5.7% |
| Medical Offices | 19 | 3.2% |
| Contractors | 14 | 2.3% |
| Auto Repair | 13 | 2.2% |
| Community & Nonprofits | 10 | 1.7% |
| Flowers & Gifts | 9 | 1.5% |
| Shipping Center | 9 | 1.5% |
| Elementary School | 9 | 1.5% |
| Hair Salons | 8 | 1.3% |
| Parks & Recreation | 8 | 1.3% |
Grundy County Business Listings
| Business | Category | City |
|---|---|---|
| Clock Tower Suites | Accommodation | Grundy Center |
| LattaHarris | Accountant | Grundy Center |
| BCLUW Softball Field | Active Life | Conrad |
| Hometown PC | Advertising Agency | Wellsburg |
| Nutrien Ag Solutions- Reinbeck, IA | Agricultural Service | Reinbeck |
| US Grain Storage Systems | Agriculture | Dike |
| Mid-Iowa Cooperative | Agriculture Association | Holland |
| Eldora Municipal Airport | Airport | Eldora |
| Grundy Center Ambulance | Ambulance And Ems Services | Grundy Center |
| Shabby Shack | Antique Store | Grundy Center |
| Download Grundy County business listings | ||
Grundy County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Grundy County Basemaps
Grundy 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 Grundy County Data Package
This page shows a preview of what's included in the Grundy 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 Grundy County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.