Louisville is a city in Boulder County, Colorado, home to about 20,786 people across 8.0 square miles. Its ZIP code is 80027.
Homes sold for a median of $358 per square foot in the three months ending August 2026, a seller’s market.
Mostly Louisville; also Superior
Each card is that ZIP code’s whole market, including any part outside Louisville. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Louisville’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Denver International Airport (DEN)26 miles away |
|---|---|
| Closer regional airport | Rocky Mountain Metropolitan Airport (BJC)5 miles away |
| Nearest city of 250,000+ | Denver, CO21 miles away |
| Nearest city of 1 million+ | Phoenix, AZ586 miles away |
Straight-line distances from the center of Louisville; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Louisville had 21,226 residents in the 2020 census, up 12% since 2000.
It’s the 38th largest of 472 towns in Colorado by population.
Boulder County grew from 21,544 residents in 1900 to 330,758 in 2020.
Boulder County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 88°F in summer, and winter lows average 21°F. About 21.3 inches of rain and melted snow fall in a typical year, with about 93 inches of snow.
Source: NOAA 1991–2020 climate normals, Boulder, CO weather station (6 miles away).
159,619 jobs at 12,990 businesses in Boulder County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
702 doctors and other health care providers list an office in Louisville.
Nearest hospitals
Providers with an office here
| Primary care doctors | 65 |
|---|---|
| Specialist doctors | 84 |
| Dentists | 70 |
| Nurse practitioners and physician assistants | 95 |
| Mental health providers | 204 |
| Physical and occupational therapists | 141 |
| Optometrists | 12 |
| Chiropractors | 31 |
| Pharmacies | 19 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (42 nearby)
Grocery stores (3 nearby)
Pharmacies (3 nearby)
Libraries (1 nearby)
Museums (1 nearby)
Theaters and performance venues (2 nearby)
Counts are within about 2 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Established in 1877.
Notable people born here
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Boulder Valley School District No. Re2. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Coal Creek Elementary SchoolLouisville | Pre-K–5 | 313 | Public | 0.7 mi |
| Eldorado K-8 SchoolSuperior | Pre-K–8 | 529 | Public | 4.1 mi |
| Fireside Elementary SchoolLouisville | Pre-K–5 | 431 | Public | 0.9 mi |
| Louisville Elementary SchoolLouisville | Pre-K–5 | 449 | Public | 0.5 mi |
| Monarch K-8 SchoolLouisville | Pre-K–8 | 698 | Public | 1.9 mi |
| Superior Elementary SchoolSuperior | K–5 | 418 | Public | 2.9 mi |
| Louisville Middle SchoolLouisville | 6–8 | 626 | Public | 0.8 mi |
| Monarch High SchoolLouisville | 9–12 | 1,431 | Public | 1.9 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Louisville Montessori SchoolLouisville | Pre-K–TK | 1 | Nonsectarian | 0.4 mi |
| St Louis Catholic SchoolLouisville | Pre-K–8 | 93 | Roman Catholic | 0.5 mi |
| Treehouse LearningLouisville | Pre-K–K | 10 | Nonsectarian | 1.6 mi |
| Fusion Academy, Boulder CountyLouisville | 6–12 | 29 | Nonsectarian | 1.3 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Superior.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.