| City: | Niwot, Colorado |
| County: | Boulder County |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 9:01:01 AM |
| Population: | 138 [See All] |
| Area Codes: | 303 / 720 / 983 |
| Classification: | PO Box |
| Coordinates: | 40.1039, -105.1704 |
| Land Area: | 0.056 sq mi |
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Niwot is a small unincorporated community in Boulder County, Colorado, covering just 0.062 square miles. Despite a local population of only 138 residents living in 66 households, the Niwot post office maintains 360 PO Boxes. That's a 5.46 adoption rate, meaning there are more than five times as many boxes as local homes. This pattern shows Niwot serves as a regional mail hub for surrounding rural areas and nearby communities that lack their own postal facilities.
This is designated as a PO Box Only Zone. There's no alternative mail delivery infrastructure across the service area. While limited street delivery exists on a few downtown streets (Murray Street, 2nd Avenue, 3rd Avenue), the vast majority of mail recipients rely exclusively on PO Boxes. Businesses dominate much of the local activity, with 41 establishments employing 244 workers within the small town footprint.
Niwot sits near Gunbarrel, about a mile away, in the Boulder metropolitan area. The community has a median age of 49.8 years, with 52 owner-occupied homes and 14 renter-occupied units among the 69 total housing units. The street layout follows a numbered grid pattern (1st through 5th Avenues) intersecting with Murray Street and Franklin Street, giving the area a traditional small-town character.
Mail delivery here uses a mixed Urban+Rural pattern, with two city carrier routes and one rural route serving the limited street addresses. Most addresses use the numbered avenues and Murray Street, which has the highest concentration of delivery points with 64 ZIP+4 records. Some addresses include UNIT designators for multi-unit buildings on Murray Street and 2nd Avenue. For the broader service area, PO Box remains the only practical mailing option.
Traditional numbered grid layout with Murray Street as the main commercial corridor.
ZIP Code 80544 has 138 residents and 66 households (average 2.09 persons per household). The median age is 49.8 years, significantly older than the state (37.2) and significantly older than the nation (38.8). The gender split is 50.7% male and 49.3% female, which is slightly higher than the national male share (49.1%), making this a male-majority area. Largest groups are White (73.9%, much higher than the national average of 61.6%) and Hispanic or Latino (8.7%); Hispanic or Latino residents make up 8.7%, which is much lower than the state average (21.9%).
Explore More:Population Over TimeBy Age & GenderBy RaceBy GenderNativity & Citizenship
| 2020 Population: | 138Source: Census DHC |
| 2024 ACS Population Estimate: | 0Source: Census ACS |
| 2026 ZC Population Estimate: | 0Source: ZIP-Codes.com |
| Population Density: | 2,464.3 people per sq mile |
| Average Income: | $0Source: Census ACS |
| Households: | 66Source: Census DHC |
| Average House Value: | $666,666,666Source: Census ACS |
| Persons Per Household: | 2.09Source: Census DHC |
| Average Family Size: | 2.77Source: Census ACS |
| Group | 2010 | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Census ACS Population Estimate | -- | 25 | 0 | 0 | 0 | 0 | 34 | 138 | 119 | 117 | 81 | 33 | 0 | 0 | 0 |
| Decennial Census | 111 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 138 | -- | -- | -- | -- |
Median Age: 49.8
Male Median Age: 40.5
Female Median Age: 58.5
| Group | < 5 | 5-9 | 10-14 | 15-19 | 20-24 | 25-29 | 30-34 | 35-39 | 40-44 | 45-49 | 50-54 | 55-59 | 60-64 | 65-69 | 70-74 | 75-79 | 80-84 | 85+ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Male | 10 | 5 | 0 | 3 | 0 | 1 | 3 | 12 | 2 | 9 | 4 | 4 | 5 | 4 | 1 | 1 | 5 | 1 |
| Female | 1 | 0 | 3 | 3 | 1 | 2 | 1 | 8 | 1 | 5 | 6 | 4 | 21 | 2 | 0 | 4 | 4 | 2 |
| Total | 11 | 5 | 3 | 6 | 1 | 3 | 4 | 20 | 3 | 14 | 10 | 8 | 26 | 6 | 1 | 5 | 9 | 3 |
| White: | 102 | 77.27% |
| Black: | 0 | 0% |
| Hispanic:* | 12 | 9.09% |
| Asian: | 6 | 4.55% |
| American Indian: | 4 | 3.03% |
| Hawaiian: | 0 | 0% |
| Other: | 8 | 6.06% |
| Total: | 132 | 100% |
| Gender | Count | % | Median Age |
|---|---|---|---|
| Males: | 70 | 50.72% | 40.5 years |
| Females: | 68 | 49.28% | 58.5 years |
| Total: | 138 | 100% | 49.8 years |
| Native, born in the United States: | 0 | 0% |
| Native, born in PR, Island Areas, or abroad: | 0 | 0% |
| Foreign born, naturalized U.S. citizen: | 0 | 0% |
| Foreign born, not a U.S. citizen: | 0 | 0% |
| Total Population: | 0 | 100% |
| Total Native Population: | 0 | 0% |
| Total Foreign-born Population: | 0 | 0% |
ZIP Code 80544 supports both business and residential activity. According to the Business Census (2024), there are 38 business establishments, employing about 252 people with an annual payroll of $13,836,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 3,383Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 38Source: CBP |
| 1st Quarter Payroll: | $4,000,000Source: CBP |
| Annual Payroll: | $13,836,000Source: CBP |
| # of Employees: | 252Source: CBP |
ZIP Code 80544 is located in Boulder County, Colorado, within the Boulder, CO Metropolitan Statistical Area (CBSA 14500) and Colorado's 2nd Congressional District. This Metro area has a population of 294,567 people, about 0.05% of whom live in ZIP Code 80544. It covers 0.056 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Boulder, COSource: Census |
| CBSA Number: | 14500Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 294,567Source: Census |
| MSA: | Denver-Boulder-Greeley, CO CMSASource: Census |
| Land Area: | 0.056 sq miSource: Census |
| Water Area: | --Source: Census |
| Congressional District: | 02Source: USPS |
| Congressional Land Area: | 7535.34 sq miSource: Census |
| PMSA: | Boulder-Longmont, CO PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 0853780Source: Census |
| Place Name: | Niwot CDP; ColoradoSource: Census |
We could not locate which school district 80544 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on February 1, 2026.