Boulder County GIS Maps
Boulder County, Colorado, has 330,758 residents across 130,165 parcels and covers 726.4 square miles. The population grew 12.3% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for Boulder County is 08013.
Boulder is the county's largest population center. Boulder County also includes 18 zip codes, 4 public school districts and 15 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.
Boulder County Trends
- Population
- 330,758▴
- Median Home Value
- $713,900▴
- K-12 Enrollment
- 75,057▾
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.
Boulder 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.
Boulder County Parcels
Boulder County has 130,165 mapped parcels covering 502,912 acres. The median assessed value is $729,300. The median lot size is 0.19 acres. 4,549 parcels are 10 acres or larger. The records carry 108,663 distinct owner names. About 6% of parcels list an owner mailing address outside Colorado. Owner names, mailing addresses, site addresses, assessed values and lot sizes are on nearly every parcel. Browse the interactive Boulder County Parcel viewer here.
Boulder County Parcel Data Coverage
| Field | Parcels | Coverage |
|---|---|---|
| Parcel ID | 130,165 | 100% |
| Owner name | 129,737 | 99.7% |
| Owner mailing address | 129,339 | 99.4% |
| Site address | 129,728 | 99.7% |
| Land use code | 0 | 0% |
| Land use description | 0 | 0% |
| Assessed value | 129,809 | 99.7% |
| Land value | 0 | 0% |
| Improvement value | 0 | 0% |
| Acreage | 129,480 | 99.5% |
| Parcel boundary | 130,165 | 100% |
| Download all Boulder County parcels. | ||
Field coverage measured across all Boulder County parcel records.
Boulder County Population
Boulder County had 330,758 residents in 2020. That was 12.3% higher than in 2010. Boulder County added 59,107 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 455 people per square mile. Some of the county's most populated postal areas include Longmont, Longmont and Superior.
Population Trend in Boulder County CO
Boulder County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Boulder County Zip Codes
Boulder County has 18 zip codes. Some of the county's most populated zip codes include Longmont (80501), Longmont (80503) and Superior (80027). Longmont is the largest zip by population, with about 42,822 residents or 13% of the county total. Together, the three largest zips account for about 34% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Boulder County CO
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 80501 | Longmont | 42,822 | ▴ 8.4% |
| 80503 | Longmont | 35,863 | ▴ 15.4% |
| 80027 | Superior | 34,413 | ▴ 10.9% |
| 80026 | Lafayette | 32,318 | ▴ 22.5% |
| 80304 | Boulder | 27,532 | ▴ 7.5% |
| Download all zip code data | |||
Boulder County Zip Code populations and trends per most recent census data.
Boulder County Demographics
Boulder County has a median age of 37.5, which is close to the Colorado average. About 18% of residents are under 18, while 15.8% 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 32.4% of the population, which points to a solid working-age base. About 63.9% of adults have a bachelor's degree or higher, above the statewide figure of 44.7%. 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 Boulder County CO
Median Age
37.5
Under 18
18%
Age 65+
15.8%
Bachelor's+
63.9%
Boulder County School Districts
Boulder County is served by 4 public school districts with 75,057 students enrolled in 2024. The largest districts on the county map are St. Vrain Valley RE 1J, Boulder Valley RE-2 and Thompson R-2J. Those three districts account for about 99% 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 Boulder County CO
| District | Enrollment | Share | Trend |
|---|---|---|---|
| St. Vrain Valley School District RE 1J | 31,607 | 42.1% | ▾ -0.5% |
| Boulder Valley School District RE-2 | 27,988 | 37.3% | ▾ -1.3% |
| Thompson School District R-2J | 14,580 | 19.4% | ▾ -2.2% |
| Estes Park School District R-3 | 882 | 1.2% | ▾ -9.2% |
| Download all school district data | |||
Boulder County school district enrollment and trends per most recent NCES reporting data.
Boulder County Housing & Real Estate
Boulder County has a median home value of $713,900 and a median gross rent of $1,893. About 62% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run above the Colorado median, while rents come in above the state average. In March 2026, the median listing price was $799,500 and homes spent about 38 days on the market.
Boulder County Housing Mix
Boulder County housing mix: owner, renter and vacant units.
Boulder County Housing Trends
Boulder County median home value and rent trend (last 5 years).
Businesses in Boulder County, CO
Boulder County has 17,572 business listings across 1,036 categories. The largest categories in Boulder County business listings are Real Estate Agents (414, 2.4%), Medical Offices (302, 1.7%), and Parks & Recreation (260, 1.5%). The full Boulder County business listings dataset includes names, categories, addresses and contact details where available. Boulder County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Boulder County, CO
| Category | Businesses | Share |
|---|---|---|
| Real Estate Agents | 414 | 2.4% |
| Medical Offices | 302 | 1.7% |
| Parks & Recreation | 260 | 1.5% |
| Professional Services | 211 | 1.2% |
| Community & Nonprofits | 202 | 1.1% |
| Counseling And Mental Health | 200 | 1.1% |
| Gyms & Fitness | 194 | 1.1% |
| Hair Salons | 182 | 1.0% |
| Chiropractors | 179 | 1.0% |
| Churches & Religious Organizations | 178 | 1.0% |
Boulder County Business Listings
| Business | Category | City |
|---|---|---|
| Boulder Abortion Clinic | Abortion Clinic | Boulder |
| Choice House | Abuse And Addiction Treatment | Boulder |
| CU Book Store | Academic Bookstore | Boulder |
| Rush Bowls | Acai Bowls | Boulder |
| The Lotus | Accommodation | Boulder |
| Williamson & Company, P.C. | Accountant | Louisville |
| Gemini Adventures | Active Life | Longmont |
| Mulberry Acupuncture and Wellness | Acupuncture | Longmont |
| Addiction Rehab Boulder | Addiction Rehabilitation Center | Boulder |
| The Relationship School | Adult Education | Boulder |
| Download Boulder County business listings | ||
Boulder County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Boulder County Basemaps
Boulder 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 Boulder County Data Package
This page shows a preview of what's included in the Boulder 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 Boulder County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.