Riley County Population

1860–2026

73,124

2026 projection

1.5% since 2020 (increase)

020K40K60K80K186018801900192019401960198020002020

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 Riley County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202673,124+5260.72%
202572,598+5260.73%
202472,072+5420.76%
202371,530-570.08%
202271,587-3020.42%
202171,889-1220.17%
202072,011-7511.03%
201972,762-2,0642.76%
201874,826+6970.94%
201774,129-1,2451.65%

Showing 10 of 31 years.

Riley County Demographics

25.5median age

Median age

Female26.4 yrs
Male25.1 yrs

Adults

60,357
7,203 seniors (65+) · 12% of adults53,154 other adults

Sex

Female 46.8% · 33,664Male 53.2% · 38,282

Population by age

MaleFemale85+ years, male: 34385+ years, female: 51780–84 years, male: 29080–84 years, female: 38775–79 years, male: 56875–79 years, female: 70270–74 years, male: 82870–74 years, female: 1,31465–69 years, male: 1,28065–69 years, female: 97460–64 years, male: 1,39960–64 years, female: 1,30255–59 years, male: 1,10855–59 years, female: 1,42350–54 years, male: 1,42150–54 years, female: 1,11945–49 years, male: 1,26645–49 years, female: 1,28640–44 years, male: 1,94040–44 years, female: 1,56935–39 years, male: 2,04535–39 years, female: 2,08930–34 years, male: 2,53830–34 years, female: 2,21525–29 years, male: 4,19225–29 years, female: 2,79620–24 years, male: 10,40720–24 years, female: 7,48615–19 years, male: 3,59415–19 years, female: 3,70410–14 years, male: 1,56910–14 years, female: 1,6365–9 years, male: 1,7345–9 years, female: 1,4800–4 years, male: 1,7600–4 years, female: 1,66585+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–45K5K

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 719 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

Riley County Income

$61,098median household income

Median household income

$61,098

Half of households earn more, half earn less

Median earnings

$47,765

Typical yearly pay for a worker 25 or older.

Poverty rate

19.9%

About 1 in 5 residents

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

Riley County Marital Status

40% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married40%39%42%
Never married49%54%45%
Divorced7%5%8%
Widowed3%2%5%
Separated<1%1%<1%

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

Sources

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

Population

American Community Survey, 2024 5-year