Jefferson County GIS Maps
Jefferson County, Kansas, has 18,368 residents and covers 532.6 square miles. The population declined 4% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Jefferson County is 20087.
Oskaloosa is the county's largest population center. Jefferson County also includes 9 zip codes, 7 public school districts and 28 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.
Jefferson County Trends
- Population
- 18,368▾
- Median Home Value
- $200,800▴
- K-12 Enrollment
- 4,488▾
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.
Jefferson 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.
Jefferson County Population
Jefferson County had 18,368 residents in 2020. That was 4% lower than in 2010. Jefferson County had 58 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 34 people per square mile. Some of the county's most populated postal areas include Meriden, Mc Louth and Oskaloosa.
Population Trend in Jefferson County KS
Jefferson County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Jefferson County Zip Codes
Jefferson County has 9 zip codes. Some of the county's most populated zip codes include Meriden (66512), Mc Louth (66054) and Oskaloosa (66066). Meriden is the largest zip by population, with about 3,390 residents or 18% of the county total. Together, the three largest zips account for about 48% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Jefferson County KS
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 66512 | Meriden | 3,390 | ▴ 0.9% |
| 66054 | Mc Louth | 2,774 | ▾ -3% |
| 66066 | Oskaloosa | 2,681 | ▴ 1.7% |
| 66070 | Ozawkie | 2,519 | ▾ -5.3% |
| 66088 | Valley Falls | 2,310 | ▾ -6% |
| Download all zip code data | |||
Jefferson County Zip Code populations and trends per most recent census data.
Jefferson County Demographics
Jefferson County has a median age of 43.8, which makes the county a little older than Kansas overall. About 22.2% of residents are under 18, while 19.4% 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 28.4% of the population, which points to a solid working-age base. About 24.6% of adults have a bachelor's degree or higher, above the statewide figure of 35.2%. The county is mostly White by population, though Hispanic, Asian, Black and multiracial residents are also part of the local mix.
Key Demographics for Jefferson County KS
Median Age
43.8
Under 18
22.2%
Age 65+
19.4%
Bachelor's+
24.6%
Jefferson County School Districts
Jefferson County is served by 7 public school districts with 4,488 students enrolled in 2024. The largest districts on the county map are Holton Unified 336, Jefferson West Unified 340 and Perry Public Schools Unified 343. Those three districts account for about 60% 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 Jefferson County KS
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Holton Unified School District 336 | 1,067 | 23.8% | ▾ -8.7% |
| Jefferson West Unified School District 340 | 843 | 18.8% | ▾ -50.8% |
| Perry Public Schools Unified School District 343 | 800 | 17.8% | ▴ 1.4% |
| Oskaloosa Public Schools Unified School District 341 | 502 | 11.2% | ▾ -6.3% |
| Jefferson County North Unified School District 339 | 455 | 10.1% | ▾ -2.2% |
| Download all school district data | |||
Jefferson County school district enrollment and trends per most recent NCES reporting data.
Jefferson County Housing & Real Estate
Jefferson County has a median home value of $200,800 and a median gross rent of $844. About 85% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the Kansas median, while rents come in below the state average. In March 2026, the median listing price was $348,700 and homes spent about 45 days on the market.
Jefferson County Housing Mix
Jefferson County housing mix: owner, renter and vacant units.
Jefferson County Housing Trends
Jefferson County median home value and rent trend (last 5 years).
Businesses in Jefferson County, KS
Jefferson County has 668 business listings across 234 categories. The largest categories in Jefferson County business listings are Churches & Religious Organizations (34, 5.1%), Farm (17, 2.5%), and Convenience Stores (13, 1.9%). The full Jefferson County business listings dataset includes names, categories, addresses and contact details where available. Jefferson County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Jefferson County, KS
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 34 | 5.1% |
| Farm | 17 | 2.5% |
| Convenience Stores | 13 | 1.9% |
| Auto Repair | 13 | 1.9% |
| Elementary School | 12 | 1.8% |
| Gas Stations | 12 | 1.8% |
| Public And Government Association | 12 | 1.8% |
| Libraries | 11 | 1.6% |
| Parks & Recreation | 11 | 1.6% |
| Insurance Agencies | 10 | 1.5% |
Jefferson County Business Listings
| Business | Category | City |
|---|---|---|
| Timber Trails Ranch | Accommodation | Winchester |
| S2 Accounting and Tax Services | Accountant | Oskaloosa |
| MMTH Creative Studio | Advertising Agency | Meriden |
| Perry Milling Feed and Supply | Agricultural Service | Perry |
| Threshing Bee Airport (5KS1) | Airport | Mc Louth |
| Pierson Remodeling | Altering And Remodeling Contractor | Nortonville |
| Jefferson County Rural Fire District 1 Kaw Township | Ambulance And Ems Services | Grantville |
| Ashlie's Homestyle Family Restaurant | American Restaurants | Oskaloosa |
| Freedom Saddles | Amusement Park | Perry |
| Jefferson County Humane Society | Animal Shelters | Valley Falls |
| Download Jefferson County business listings | ||
Jefferson County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Jefferson County Basemaps
Jefferson 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 Jefferson County Data Package
This page shows a preview of what's included in the Jefferson 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 Jefferson County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.