Marion County Population

1850–2026

457.33K

2026 projection

21.2% since 2020 (increase)

0100K200K300K400K500K186018801900192019401960198020002020

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.
2026457,325+14,6653.31%
2025442,660+14,6653.43%
2024427,995+15,6953.81%
2023412,300+15,2253.83%
2022397,075+11,8723.08%
2021385,203+7,7712.06%
2020377,432+11,4353.12%
2019365,997+6,3671.77%
2018359,630+5,6771.60%
2017353,953+5,9951.72%

Showing 10 of 32 years.

Marion County Demographics

47.9median age

Median age

Female49.8 yrs
Male45.9 yrs

Adults

325,035
114,789 seniors (65+) · 35% of adults210,246 other adults

Sex

Female 51.7% · 206,740Male 48.3% · 193,338

Population by age

MaleFemale85+ years, male: 5,61185+ years, female: 7,71780–84 years, male: 7,49080–84 years, female: 8,57275–79 years, male: 11,50375–79 years, female: 12,57070–74 years, male: 13,79170–74 years, female: 15,52865–69 years, male: 14,33965–69 years, female: 17,66860–64 years, male: 14,04060–64 years, female: 14,38555–59 years, male: 11,44155–59 years, female: 14,74350–54 years, male: 10,91250–54 years, female: 11,79945–49 years, male: 9,76645–49 years, female: 10,39940–44 years, male: 9,90140–44 years, female: 10,58935–39 years, male: 11,02435–39 years, female: 11,43830–34 years, male: 11,09930–34 years, female: 11,76725–29 years, male: 10,54325–29 years, female: 10,49320–24 years, male: 9,52820–24 years, female: 9,38315–19 years, male: 10,64415–19 years, female: 9,83710–14 years, male: 12,88010–14 years, female: 10,9925–9 years, male: 9,0825–9 years, female: 9,7910–4 years, male: 9,7440–4 years, female: 9,06985+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–45K5K10K10K15K15K

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 4,001 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

$61,010median household income

Median household income

$61,010

Half of households earn more, half earn less

Median earnings

$40,123

Typical yearly pay for a worker 25 or older.

Poverty rate

14.4%

About 1 in 7 residents

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

Marion County Marital Status

50% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married50%53%47%
Never married26%29%24%
Divorced13%12%14%
Widowed9%5%13%
Separated2%1%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