Marion County Population

1830–2026

994.18K

2026 projection

1.8% since 2020 (increase)

0200K400K600K800K1M1850190019502000

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 Marion County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
2026994,179+1,9830.20%
2025992,196+1,9830.20%
2024990,213+9,8861.01%
2023980,327+6,0340.62%
2022974,293+2,9200.30%
2021971,373-5,3350.55%
2020976,708+12,8791.34%
2019963,829+4,4590.46%
2018959,370+8,1230.85%
2017951,247+5,1970.55%

Showing 10 of 34 years.

Marion County Demographics

34.4median age

Median age

Female35.3 yrs
Male33.4 yrs

Adults

731,894
128,452 seniors (65+) · 18% of adults603,442 other adults

Sex

Female 51.6% · 503,249Male 48.4% · 472,560

Population by age

MaleFemale85+ years, male: 4,80685+ years, female: 9,44280–84 years, male: 4,80580–84 years, female: 8,38075–79 years, male: 9,10575–79 years, female: 11,44270–74 years, male: 14,80270–74 years, female: 18,98565–69 years, male: 21,86265–69 years, female: 24,82360–64 years, male: 26,97960–64 years, female: 30,13755–59 years, male: 25,24955–59 years, female: 27,08850–54 years, male: 26,19650–54 years, female: 27,97845–49 years, male: 26,43245–49 years, female: 27,98040–44 years, male: 30,62640–44 years, female: 31,13135–39 years, male: 33,78035–39 years, female: 36,09330–34 years, male: 39,22430–34 years, female: 41,11525–29 years, male: 39,48025–29 years, female: 41,80120–24 years, male: 32,53920–24 years, female: 35,06415–19 years, male: 32,65015–19 years, female: 31,82110–14 years, male: 34,65110–14 years, female: 33,4705–9 years, male: 34,5355–9 years, female: 32,8940–4 years, male: 34,8390–4 years, female: 33,60585+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–420K20K

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 9,758 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

Marion County Income

$66,346median household income

Median household income

$66,346

Half of households earn more, half earn less

Median earnings

$47,631

Typical yearly pay for a worker 25 or older.

Poverty rate

15.4%

About 1 in 7 residents

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

Marion County Marital Status

41% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married41%44%39%
Never married40%42%39%
Divorced12%11%14%
Widowed5%2%7%
Separated2%2%2%

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