Population

105,689

US Census estimate, July 2025

Median home value

$1,039,500

Owner-occupied units

Boulder, CO

Colorado · 40.024° N, 105.251° W · 27 sq mi

Boulder is a city in Colorado, with a population of 105,689 and about 3,925 residents per square mile. The median household earns $87,493 a year, and the median home is worth $1,039,500.

Conditions

Humidity & wind

—

UV index

—

Sunrise & sunset

—

Local time

—

Forgotten Flicks movie T-shirts on TeePublic

Size & density

Land area

27 sq mi

Water excluded

Population density

3,925

People per square mile

Rank by population

#324

Of cities on this site

Rank by area

#508

Of cities on this site

Money & housing

Median household income

$87,493

US median ≈ $78,538

Median gross rent

$2,018

Per month

Homeownership

47.2%

US ≈ 65%

Average commute

18.1 min

One way

People

Median age

28.8

US median 39.1

Bachelor's degree +

76.8%

Age 25 and over

Foreign born

10.8%

Households

44,432

2.12 people each

Climate · 2021–2025 average

Clear days 33^/yr Mostly or fully clear sky

Days with rain 122^/yr 0.01 in or more

Days with snow 59^/yr

Days above 90° 20^/yr

Below freezing 150^/yr

Annual rainfall 18.4ⁱⁿ Inches per year, scaled to 70 in — the rows above count days

Warmest month

July

Average high 86°F

Coldest month

February

Average low 14°F

What people here do for work

Education & health care 26.8^%

Professional & business services 21.2^%

Arts, food & hospitality 14.4^%

Retail trade 9.7^%

Top four industries · share of all workers · ACS 2024

Wealthiest person in Colorado

Name

Philip Anschutz

Forbes, Apr 2025

Net worth

$16.9B

As of 25 Apr 2025 — not live

Lives in

Denver

Source of wealth

Energy, sports, entertainment

Compiled from public reporting, not from an official dataset, and not independently verified.

Largest employer in Colorado · private sector

Employer

UCHealth

Sector

Healthcare

Compiled from public reporting, not from an official dataset, and not independently verified. Government employers are excluded.

Largest public company in Colorado

Company

Arrow Electronics

Revenue

$27.9B

Fiscal year 2024

Headquarters

Centennial

Ticker

ARW

Compiled from public reporting, not from an official dataset, and not independently verified.

State of Colorado

State bird

Lark Bunting

State flower

Rocky Mountain Columbine

State capital