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Where 80305 is
Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.
- 🔢 Type 80305 into a pocket calculator and turn it upside down: SOEOB — not quite a word, sorry.
- ➕ As a number, 80,305 = 5 × 16061. Its digits add up to 16, a total 1,922 other ZIP codes share.
- 💾In binary, the way a computer stores it:
10011100110110001 - 🏠 Its numerical neighbours: 80304 (Boulder, CO, 5 mi away) and 80306 (Boulder, CO, 11 mi away).
- 🔄 Backwards, 80305 becomes 50308 — and that is a real ZIP code: Des Moines, IA, 621 miles away.
- 👥 27 other ZIP codes are made of exactly the same digits (03580, 03850, 05038, 05083, 05830, 08035, …). The farthest-flung twin is 03850 in Melvin Village, NH, 1,754 miles away.
- 🧭 Farther north than 56% of all ZIP codes, and farther west than 83%.
- 🎯354 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 80305 and you would come out at 39.98°S, 74.75°E — 684 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 01m of daylight. Shortest: 9h 20m.
- 📏 At 5.8 square miles of land, 80305 is bigger than 20% of ZIP codes — room for about 4.4 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 16,291This ZIP16,291 |
|---|---|
| Households | 6,976This ZIP6,976 |
| Housing units | 7,303This ZIP7,303 |
| Median age | 36.7This ZIP36.7Colorado37.7US 38.9 |
| Median household income | $126,107This ZIP$126,107Colorado$95,470US $80,734 |
| Median home value | $1,032,900This ZIP$1,032,900Colorado$539,400US $332,700 |
| Median gross rent | $2,311This ZIP$2,311Colorado$1,761US $1,413 |
| Bachelor's degree or higher | 79.4%This ZIP79.4% |
| Mean commute | 18.8 minThis ZIP18.8 min |
| Population density | 2,799.1 / sq miThis ZIP2,799.1 / sq mi |
Business and tax activity
| Business establishments | 469This ZIP469 |
|---|---|
| Employees | 2,985This ZIP2,985 |
| Annual payroll | $171,328,000This ZIP$171,328,000 |
| Tax returns filed | 8,600This ZIP8,600 |
| Total adjusted gross income | $1,409,595,000This ZIP$1,409,595,000 |
Land area
| Land area | 5.82 sq miThis ZIP5.82 sq mi |
|---|---|
| Water area | 0.05 sq miThis ZIP0.05 sq mi |
Other place names in 80305
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 80305
| ZIP | City | Distance |
|---|---|---|
80310 | Boulder, CO | 2.0 mi |
80303 | Boulder, CO | 2.1 mi |
80309 | Boulder, CO | 2.9 mi |
80025 | Eldorado Springs, CO | 4.5 mi |
80027 | Louisville, CO | 5.1 mi |
80304 | Boulder, CO | 5.1 mi |
80301 | Boulder, CO | 5.4 mi |
80302 | Boulder, CO | 6.3 mi |
80007 | Arvada, CO | 8.1 mi |
80308 | Boulder, CO | 8.1 mi |
Find every ZIP code within 10 miles of 80305 →
Questions about this ZIP code
Where is ZIP code 80305?
80305 is in Boulder, Colorado, in Boulder County, part of the Boulder, CO metropolitan area. Its published point location is 39.9769, -105.2487.
What county is 80305 in?
80305 lies in Boulder County.
What area code is 80305?
Boulder uses area codes 720, 303 and 983, from NANPA's telephone records.
What time zone is 80305 in?
80305 uses America/Denver.
How many people live in 80305?
About 16,291 people live in ZIP code 80305, in 6,976 households, at 2,799.1 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.
What is the median household income in 80305?
$126,107 a year, against $95,470 across Colorado.
What ZIP codes are near 80305?
The closest are 80310 (2 mi), 80303 (2.1 mi), 80309 (2.9 mi), 80025 (4.5 mi) and 80027 (5.1 mi).
Is 80305 a PO Box ZIP code?
80305 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “80305 ZIP Code — Boulder, Colorado (Boulder County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/80305
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/80305.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.