Poweshiek County GIS Maps

Poweshiek 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.

Poweshiek County Parcels

Poweshiek County has 1,498 mapped parcels. The median assessed value is $76,060. The median lot size is 37.60 acres. 1,017 parcels are 10 acres or larger. The records carry 970 distinct owner names. Owner names and assessed values are on nearly every parcel. Lot sizes reach 97.9%. Browse the interactive Poweshiek County Parcel viewer here.

Poweshiek County Parcel Data Coverage

Field coverage measured across all Poweshiek County parcel records. Download free sample data here.

Poweshiek County Population

Poweshiek County had 18,662 residents in 2020. That was 1.3% lower than in 2010. Poweshiek County had 153 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 32 people per square mile. Some of the county's most populated postal areas include Grinnell, Montezuma and Brooklyn.

Population Trend in Poweshiek County IA

Poweshiek County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.

Poweshiek County Zip Codes

Poweshiek County has 8 zip codes. Some of the county's most populated zip codes include Grinnell (50112), Montezuma (50171) and Brooklyn (52211). Grinnell is the largest zip by population, with about 11,849 residents or 63% of the county total. Together, the three largest zips account for about 92% of all county residents based on 2020 population estimates.

Most Populated Zip Codes in Poweshiek County IA

Poweshiek County Zip Code populations and trends per most recent census data.

Poweshiek County Demographics

Poweshiek County has a median age of 40.8, which makes the county a little older than Iowa overall. About 19.5% of residents are under 18, while 21% 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 25.3% of the population, which points to a solid working-age base. About 28.2% 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 Poweshiek County IA

Poweshiek County School Districts

Poweshiek County is served by 11 public school districts with 6,980 students enrolled in 2024. The largest districts on the county map are Grinnell-Newburg Community, South Tama County Community and East Marshall Community. Those three districts account for about 50% 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 Poweshiek County IA

Poweshiek County school district enrollment and trends per most recent NCES reporting data.

Poweshiek County Housing & Real Estate

Poweshiek County has a median home value of $184,200 and a median gross rent of $864. About 71% 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 $258,000 and homes spent about 54 days on the market.

Businesses in Poweshiek County, IA

Poweshiek County has 1,020 business listings across 340 categories. The largest categories in Poweshiek County business listings are Churches & Religious Organizations (31, 3.0%), Medical Offices (23, 2.3%), and Insurance Agencies (19, 1.9%). The full Poweshiek County business listings dataset includes names, categories, addresses and contact details where available. Poweshiek County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.

Top Business Categories in Poweshiek County, IA

Poweshiek County Business Listings

Poweshiek County business listings sourced from Overture Maps. Includes locations with a high level of confidence.

Poweshiek County Basemaps

Poweshiek 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.

Preview a Live Package Demo

See exactly what is included in a county data package. Inspect how files are organized, the interactive data explorer and how maps and analytics are laid out. The demo loads a real sample package from Iowa — explore the full structure before you buy.