Longmont Population

1880–2026

100.21K

2026 projection

1% since 2020 (increase)

020K40K60K80K100K120K18801900192019401960198020002020

Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.

Use the left and right arrow keys to inspect population observations.

Population by year

Population estimates for Longmont. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
2026100,211+1020.10%
2025100,109+5090.51%
202499,600+6100.62%
202398,990+20.00%
202298,988-7740.78%
202199,762+5700.57%
202099,192+1,8761.93%
201997,316+2,0652.17%
201895,251+7190.76%
201794,532+4780.51%

Showing 10 of 30 years.

Longmont Demographics

40.3median age

Median age

Female42.5 yrs
Male38.8 yrs

Adults

80,682
18,520 seniors · 23%62,162 other adults

Sex

Female 50.3% · 50,014Male 49.7% · 49,392

Population by age

MaleFemale85+ years, male: 69985+ years, female: 1,74780–84 years, male: 85380–84 years, female: 99975–79 years, male: 1,53075–79 years, female: 1,52170–74 years, male: 2,14270–74 years, female: 2,97465–69 years, male: 2,83365–69 years, female: 3,22260–64 years, male: 3,16060–64 years, female: 3,32055–59 years, male: 3,23055–59 years, female: 3,36750–54 years, male: 3,36350–54 years, female: 3,25045–49 years, male: 2,40545–49 years, female: 2,96640–44 years, male: 3,36040–44 years, female: 3,23535–39 years, male: 3,93135–39 years, female: 3,07630–34 years, male: 3,82830–34 years, female: 3,62325–29 years, male: 3,61425–29 years, female: 3,22020–24 years, male: 3,35720–24 years, female: 3,29315–19 years, male: 3,35715–19 years, female: 2,99910–14 years, male: 2,83010–14 years, female: 2,4315–9 years, male: 2,5775–9 years, female: 2,2870–4 years, male: 2,3230–4 years, female: 2,48485+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–41K1K2K2K3K3K

Hover or tap an age group to see exact counts. Use the up and down arrow keys to inspect age groups.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101

Race and ethnicity

Tap a square or a group below to highlight it.

Each square is about 1% of residents (roughly 994 people).

Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002

Longmont Income

$90,671median household income

Median household income

$90,671

Half of households earn more, half earn less

Median earnings

$56,356

Typical yearly pay for a worker 25 or older.

Poverty rate

8.6%

About 1 in 12 residents

U.S. Census Bureau, 2024 ACS 5-year estimates · Tables S1901, S1501, S1701

Longmont Marital Status

46% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married46%47%46%
Never married34%38%29%
Divorced14%12%15%
Widowed5%3%8%
Separated1%<1%2%

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201

Sources

10 sources, all from the U.S. Census Bureau

Population

American Community Survey, 2024 5-year