Allen County GIS Maps
Allen County, Ohio, has 102,206 residents and covers 402.5 square miles. The population declined 3.9% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Allen County is 39003.
Lima is the county's largest population center. Allen County also includes 13 zip codes, 11 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.
Allen County Trends
- Population
- 102,206▾
- Median Home Value
- $158,400▴
- K-12 Enrollment
- 15,385▾
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.
Allen 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.
Allen County Population
Allen County had 102,206 residents in 2020. That was 3.9% lower than in 2010. Allen County had 6,537 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 254 people per square mile. Some of the county's most populated postal areas include Lima, Lima and Lima.
Population Trend in Allen County OH
Allen County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Allen County Zip Codes
Allen County has 13 zip codes. Some of the county's most populated zip codes include Lima (45801), Lima (45805) and Lima (45804). Lima is the largest zip by population, with about 22,819 residents or 22% of the county total. Together, the three largest zips account for about 59% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Allen County OH
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 45801 | Lima | 22,819 | ▾ -9.8% |
| 45805 | Lima | 22,740 | ▴ 1% |
| 45804 | Lima | 14,573 | ▾ -7.5% |
| 45807 | Elida | 11,856 | ▾ -3% |
| 45806 | Cridersville | 11,238 | ▴ 0.7% |
| Download all zip code data | |||
Allen County Zip Code populations and trends per most recent census data.
Allen County Demographics
Allen County has a median age of 39.7, which is close to the Ohio average. About 23.6% of residents are under 18, while 18.7% 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 29.6% of the population, which points to a solid working-age base. About 19.9% 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 Allen County OH
Median Age
39.7
Under 18
23.6%
Age 65+
18.7%
Bachelor's+
19.9%
Allen County School Districts
Allen County is served by 11 public school districts with 15,385 students enrolled in 2024. The largest districts on the county map are Lima City, Shawnee Local and Elida Local. 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 Allen County OH
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Lima City School District | 3,370 | 21.9% | ▴ 1.1% |
| Shawnee Local School District | 2,239 | 14.6% | ▾ -1.6% |
| Elida Local School District | 2,016 | 13.1% | ▾ -3.1% |
| Bath Local School District | 1,588 | 10.3% | ▾ -2.3% |
| Bluffton Exempted Village School District | 1,248 | 8.1% | ▴ 1% |
| Download all school district data | |||
Allen County school district enrollment and trends per most recent NCES reporting data.
Allen County Housing & Real Estate
Allen County has a median home value of $158,400 and a median gross rent of $898. About 68% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the Ohio median, while rents come in below the state average. In March 2026, the median listing price was $183,725 and homes spent about 55 days on the market.
Allen County Housing Mix
Allen County housing mix: owner, renter and vacant units.
Allen County Housing Trends
Allen County median home value and rent trend (last 5 years).
Businesses in Allen County, OH
Allen County has 4,361 business listings across 652 categories. The largest categories in Allen County business listings are Churches & Religious Organizations (141, 3.2%), Contractors (74, 1.7%), and Auto Repair (70, 1.6%). The full Allen County business listings dataset includes names, categories, addresses and contact details where available. Allen County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Allen County, OH
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 141 | 3.2% |
| Contractors | 74 | 1.7% |
| Auto Repair | 70 | 1.6% |
| Beauty Salons | 67 | 1.5% |
| ATMs | 60 | 1.4% |
| Pizza Restaurants | 54 | 1.2% |
| Gas Stations | 52 | 1.2% |
| Medical Offices | 51 | 1.2% |
| Car Dealerships | 43 | 1.0% |
| Hospitals | 42 | 1.0% |
Allen County Business Listings
| Business | Category | City |
|---|---|---|
| Community Medical Services | Abuse And Addiction Treatment | Lima |
| The Annex of Lima / Longmeadow of Lima | Accommodation | Lima |
| Fortune Accounting and Business Solutions | Accountant | Lima |
| Hog Creek Game Club | Active Life | Ada |
| LOAM Acupuncture & Herbal Medicine | Acupuncture | Lima |
| Adam & Eve Stores | Adult Entertainment | Lima |
| PromoHits | Advertising Agency | Bluffton |
| Suever Seed & Feed | Agricultural Cooperatives | Delphos |
| Layman Feed & Lawn | Agricultural Service | Elida |
| Heritage Cooperative | Agriculture | Cairo |
| Download Allen County business listings | ||
Allen County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Allen County Basemaps
Allen 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 Allen County Data Package
This page shows a preview of what's included in the Allen 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 Allen County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.