Welby is a community in Adams County, Colorado, home to about 16,197 people across 3.7 square miles. It has no ZIP code of its own: it’s part of 80229.
Homes sold for a median of $264 per square foot in the three months ending August 2026, a seller’s market.
Mostly Thornton; part is in Welby
Each card is that ZIP code’s whole market, including any part outside Welby. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Welby’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)13 miles away |
|---|---|
| Nearest city of 250,000+ | Denver, CO8 miles away |
| Nearest city of 1 million+ | Phoenix, AZ588 miles away |
Straight-line distances from the center of Welby; 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.
Welby had 15,553 residents in the 2020 census, up 20% since 2000.
It’s the 49th largest of 472 towns in Colorado by population.
Adams County grew from 8,892 residents in 1910 to 519,572 in 2020.
Adams County, 1910–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 91°F in summer, and winter lows average 19°F. About 14.5 inches of rain and melted snow fall in a typical year, with about 45 inches of snow.
Source: NOAA 1991–2020 climate normals, Northglenn, CO weather station (5 miles away).
207,227 jobs at 11,319 businesses in Adams County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
486 doctors and other health care providers list an office in Welby.
Nearest hospitals
Providers with an office here
| Primary care doctors | 38 |
|---|---|
| Specialist doctors | 108 |
| Dentists | 54 |
| Nurse practitioners and physician assistants | 118 |
| Mental health providers | 82 |
| Physical and occupational therapists | 59 |
| Optometrists | 14 |
| Chiropractors | 13 |
| Pharmacies | 8 |
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 (10 nearby)
Grocery stores
Pharmacies
Libraries
Theaters and performance venues
Counts are within about 1.5 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.
Public schools here are run by Mapleton School District No. 1 in the county of Adams & St, Adams 12 Five Star Schools. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Achieve AcademyThornton | Pre-K–8 | 370 | Public | 2.1 mi |
| Coronado Hills Elementary SchoolThornton | Pre-K–5 | 412 | Public | 2.8 mi |
| Explore Pk-8Thornton | Pre-K–8 | 557 | Public | 2.1 mi |
| Meadow Community SchoolThornton | Pre-K–8 | 378 | Public | 1.2 mi |
| Thornton Elementary SchoolThornton | Pre-K–5 | 387 | Public | 2.8 mi |
| Welby Community School of the ArtsDenver | Pre-K–6 | 308 | Public | 3.4 mi |
| Clayton Partnership SchoolThornton | K–8 | 430 | Public | 2.0 mi |
| McElwain Elementary SchoolThornton | K–5 | 361 | Public | 2.9 mi |
| Monterey Community SchoolDenver | K–8 | 440 | Public | 2.3 mi |
| York InternationalThornton | K–12 | 776 | Public | 1.9 mi |
| Thornton Middle SchoolThornton | 6–8 | 721 | Public | 2.9 mi |
| Academy High SchoolThornton | 9–12 | 399 | Public | 2.0 mi |
| Mapleton Early Career PreparationThornton | 9–12 | 306 | Public | 1.9 mi |
| New America School - ThorntonThornton | 9–12 | 190 | Charter, Alternative Education | 2.9 mi |
| North Valley School for Young AdultsThornton | 9–12 | 102 | Alternative Education | 2.0 mi |
| Thornton High SchoolThornton | 9–12 | 1,439 | Public | 3.0 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Assumption Catholic SchoolDenver | Pre-K–8 | 128 | Roman Catholic | 2.7 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 Thornton and North Washington.
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.