Waterloo Population

1870–2026

66,855

2026 projection

0.6% since 2020 (decrease)

020K40K60K80K18801900192019401960198020002020

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 Waterloo. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202666,855-640.10%
202566,919-860.13%
202467,005+3090.46%
202366,696+2040.31%
202266,492-4050.61%
202166,897-3620.54%
202067,259-1420.21%
201967,401-3120.46%
201867,713-600.09%
201767,773-3660.54%

Showing 10 of 31 years.

Waterloo Demographics

36.7median age

Median age

Female37.2 yrs
Male36.4 yrs

Adults

50,599
11,387 seniors · 23%39,212 other adults

Sex

Female 51% · 34,173Male 49% · 32,835

Population by age

MaleFemale85+ years, male: 41985+ years, female: 81480–84 years, male: 59380–84 years, female: 69075–79 years, male: 94975–79 years, female: 1,15370–74 years, male: 1,18770–74 years, female: 1,77165–69 years, male: 1,86765–69 years, female: 1,94460–64 years, male: 2,22560–64 years, female: 2,24455–59 years, male: 1,94955–59 years, female: 1,84050–54 years, male: 1,55450–54 years, female: 1,55145–49 years, male: 1,84445–49 years, female: 1,69540–44 years, male: 2,22840–44 years, female: 2,17835–39 years, male: 2,18035–39 years, female: 2,27830–34 years, male: 2,24830–34 years, female: 2,11725–29 years, male: 2,39925–29 years, female: 2,57120–24 years, male: 2,16020–24 years, female: 2,52315–19 years, male: 2,20815–19 years, female: 1,81810–14 years, male: 2,09510–14 years, female: 2,1495–9 years, male: 2,2515–9 years, female: 2,3030–4 years, male: 2,4790–4 years, female: 2,53485+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–41K1K2K2K

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 670 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

Waterloo Income

$57,480median household income

Median household income

$57,480

Half of households earn more, half earn less

Median earnings

$43,322

Typical yearly pay for a worker 25 or older.

Poverty rate

16.6%

About 1 in 6 residents

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

Waterloo Marital Status

42% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married42%43%40%
Never married38%42%35%
Divorced12%11%14%
Widowed6%3%8%
Separated2%2%3%

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