Columbia County GIS Maps
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Columbia County, Washington, has 3,952 residents across 5,275 parcels and covers 868.6 square miles. The population declined 3.1% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Columbia County is 53013.
Dayton is the county's largest population center. Columbia County also includes 2 zip codes, 4 public school districts and 9 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.
Columbia County Trends
- Population
- 3,952▾
- Median Home Value
- $256,100▴
- K-12 Enrollment
- 1,678▴
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.
Columbia 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.
Columbia County Parcels
Columbia County has 5,275 mapped parcels covering 395,852 acres. The median assessed value is $69,600. Assessed values are on nearly every parcel. Site addresses reach 54.5%. Browse the interactive Columbia County Parcel viewer here.
Columbia County Parcel Data Coverage
| Field | Parcels | Coverage |
|---|---|---|
| Parcel ID | 5,275 | 100% |
| Owner name | 0 | 0% |
| Owner mailing address | 0 | 0% |
| Site address | 2,875 | 54.5% |
| Land use code | 5,209 | 98.7% |
| Land use description | 0 | 0% |
| Assessed value | 5,191 | 98.4% |
| Land value | 5,209 | 98.7% |
| Improvement value | 5,209 | 98.7% |
| Acreage | 0 | 0% |
| Parcel boundary | 5,275 | 100% |
| Download all Columbia County parcels. | ||
Field coverage measured across all Columbia County parcel records.
Columbia County Population
Columbia County had 3,952 residents in 2020. That was 3.1% lower than in 2010. Columbia County had 112 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 5 people per square mile. Two of the county's most populated postal areas are Dayton and Starbuck.
Population Trend in Columbia County WA
Columbia County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Columbia County Zip Codes
Columbia County has 2 zip codes. Two of the county's most populated zip codes are Dayton (99328) and Starbuck (99359). Dayton is the largest zip by population, with about 3,620 residents or 92% of the county total. Together, the three largest zips account for about 96% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Columbia County WA
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 99328 | Dayton | 3,620 | ▾ -3% |
| 99359 | Starbuck | 155 | ▾ -1.9% |
| Download all zip code data | |||
Columbia County Zip Code populations and trends per most recent census data.
Columbia County Demographics
Columbia County has a median age of 52.1, which makes the county a little older than Washington overall. About 16.9% of residents are under 18, while 29.7% 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 29.7% of the population, which points to an older population profile. About 27.2% of adults have a bachelor's degree or higher, above the statewide figure of 38.8%. The county is majority White by population, with Hispanic, Asian, Black and multiracial residents making up a meaningful share of the local mix.
Key Demographics for Columbia County WA
Median Age
52.1
Under 18
16.9%
Age 65+
29.7%
Bachelor's+
27.2%
Columbia County School Districts
Columbia County is served by 4 public school districts with 1,678 students enrolled in 2024. The largest districts on the county map are Starbuck, Dayton and Waitsburg. Those three districts account for about 87% of public school enrollment in the map area. Total enrollment has grown modestly since 2017 across the districts shown on the county map.
Largest School Districts by Enrollment in Columbia County WA
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Starbuck School District | 765 | 45.6% | ▴ 9.8% |
| Dayton School District | 379 | 22.6% | ▴ 7.7% |
| Waitsburg School District | 309 | 18.4% | ▴ 111.6% |
| Prescott School District | 225 | 13.4% | ▴ 2.7% |
| Download all school district data | |||
Columbia County school district enrollment and trends per most recent NCES reporting data.
Columbia County Housing & Real Estate
Columbia County has a median home value of $256,100 and a median gross rent of $944. About 78% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the Washington median, while rents come in below the state average. In March 2026, the median listing price was $351,000 and homes spent about 144 days on the market.
Columbia County Housing Mix
Columbia County housing mix: owner, renter and vacant units.
Columbia County Housing Trends
Columbia County median home value and rent trend (last 5 years).
Businesses in Columbia County, WA
Columbia County has 231 business listings across 136 categories. The largest categories in Columbia County business listings are Churches & Religious Organizations (14, 6.1%), Convenience Stores (6, 2.6%), and Grocery Stores (6, 2.6%). The full Columbia County business listings dataset includes names, categories, addresses and contact details where available. Columbia County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Columbia County, WA
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 14 | 6.1% |
| Convenience Stores | 6 | 2.6% |
| Grocery Stores | 6 | 2.6% |
| Banks & Credit Unions | 6 | 2.6% |
| Gas Stations | 5 | 2.2% |
| Campgrounds & RV Parks | 4 | 1.7% |
| Hotels | 4 | 1.7% |
| Beauty Salons | 4 | 1.7% |
| Dental Offices | 4 | 1.7% |
| Coffee Shops | 3 | 1.3% |
Columbia County Business Listings
| Business | Category | City |
|---|---|---|
| Eslick Farms | Accommodation | Dayton |
| Tucannon Fish Hatchery | Active Life | Pomeroy |
| Denise Lane | Acupuncture | Dayton |
| Seneca Foods | Agricultural Service | Dayton |
| The McGregor Company - Dayton, WA | Agriculture | Dayton |
| Grain House Grill | American Restaurants | Dayton |
| Manila Bay | Asian Restaurant | Dayton |
| Rivers Walk - Assisted Living Facility, LLC | Assisted Living Facility | Dayton |
| The Exchange Network | ATMs | Dayton |
| Jay's Garage | Auto Repair | Dayton |
| Download Columbia County business listings | ||
Columbia County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Columbia County Basemaps
Columbia 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 Columbia County Data Package
This page shows a preview of what's included in the Columbia 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 Columbia County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.