Ottawa County GIS Maps
Ottawa County, Ohio, has 40,364 residents and covers 254.7 square miles. The population declined 2.6% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Ottawa County is 39123.
Port Clinton is the county's largest population center. Ottawa County also includes 15 zip codes, 8 public school districts and 21 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.
Ottawa County Trends
- Population
- 40,364▾
- Median Home Value
- $200,700▴
- K-12 Enrollment
- 5,580▾
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.
Ottawa 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.
Ottawa County Population
Ottawa County had 40,364 residents in 2020. That was 2.6% lower than in 2010. Ottawa County had 621 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 158 people per square mile. Some of the county's most populated postal areas include Port Clinton, Oak Harbor and Lakeside Marblehead.
Population Trend in Ottawa County OH
Ottawa County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Ottawa County Zip Codes
Ottawa County has 15 zip codes. Some of the county's most populated zip codes include Port Clinton (43452), Oak Harbor (43449) and Lakeside Marblehead (43440). Port Clinton is the largest zip by population, with about 13,443 residents or 33% of the county total. Together, the three largest zips account for about 65% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Ottawa County OH
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 43452 | Port Clinton | 13,443 | ▾ -2.7% |
| 43449 | Oak Harbor | 8,057 | ▾ -2.7% |
| 43440 | Lakeside Marblehead | 4,665 | ▾ -4.3% |
| 43430 | Genoa | 4,631 | ▾ -3.2% |
| 43416 | Elmore | 2,769 | ▾ -4.2% |
| Download all zip code data | |||
Ottawa County Zip Code populations and trends per most recent census data.
Ottawa County Demographics
Ottawa County has a median age of 50.3, which makes the county a little older than Ohio overall. About 17.7% of residents are under 18, while 27% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 65 and over at about 27% of the population, which points to an older population profile. About 28.5% 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 Ottawa County OH
Median Age
50.3
Under 18
17.7%
Age 65+
27%
Bachelor's+
28.5%
Ottawa County School Districts
Ottawa County is served by 8 public school districts with 5,580 students enrolled in 2024. The largest districts on the county map are Port Clinton City, Benton-Carroll-Salem Local and Genoa Area Local. Those three districts account for about 72% 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 Ottawa County OH
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Port Clinton City School District | 1,400 | 25.1% | ▾ -2.6% |
| Benton-Carroll-Salem Local School District | 1,341 | 24% | ▴ 0.4% |
| Genoa Area Local School District | 1,279 | 22.9% | ▾ -2.6% |
| Woodmore Local School District | 927 | 16.6% | ▾ -5.2% |
| Danbury Local School District | 555 | 9.9% | ▴ 2% |
| Download all school district data | |||
Ottawa County school district enrollment and trends per most recent NCES reporting data.
Ottawa County Housing & Real Estate
Ottawa County has a median home value of $200,700 and a median gross rent of $909. 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 Ohio median, while rents come in below the state average. In March 2026, the median listing price was $454,475 and homes spent about 73 days on the market.
Ottawa County Housing Mix
Ottawa County housing mix: owner, renter and vacant units.
Ottawa County Housing Trends
Ottawa County median home value and rent trend (last 5 years).
Businesses in Ottawa County, OH
Ottawa County has 2,479 business listings across 465 categories. The largest categories in Ottawa County business listings are Fishing Charter (76, 3.1%), Hotels (58, 2.3%), and Marina (55, 2.2%). The full Ottawa County business listings dataset includes names, categories, addresses and contact details where available. Ottawa County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Ottawa County, OH
| Category | Businesses | Share |
|---|---|---|
| Fishing Charter | 76 | 3.1% |
| Hotels | 58 | 2.3% |
| Marina | 55 | 2.2% |
| Bars & Nightlife | 55 | 2.2% |
| Churches & Religious Organizations | 53 | 2.1% |
| Parks & Recreation | 53 | 2.1% |
| Contractors | 37 | 1.5% |
| Real Estate Agents | 37 | 1.5% |
| Community & Nonprofits | 36 | 1.5% |
| Landmark And Historical Building | 35 | 1.4% |
Ottawa County Business Listings
| Business | Category | City |
|---|---|---|
| Green Cove. Condominiums | Accommodation | Oak Harbor |
| Village Carts | Active Life | Put-in-Bay |
| Terem Marketing | Advertising Agency | Elmore |
| KNG Show Lambs | Agricultural Service | Oak Harbor |
| Gargas Farms | Agriculture | Genoa |
| Put-in-Bay Airport | Airport | Put-in-Bay |
| Thrive Drip Solutions | Alternative Medicine | Port Clinton |
| Mid County EMS | Ambulance And Ems Services | Oak Harbor |
| The MacStack Tavern | American Restaurants | Port Clinton |
| Kimberly's Carousel | Amusement Park | Put-in-Bay |
| Download Ottawa County business listings | ||
Ottawa County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Ottawa County Basemaps
Ottawa 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 Ottawa County Data Package
This page shows a preview of what's included in the Ottawa 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 Ottawa County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.