Mason City Population

1870–2026

26,749

2026 projection

1.9% since 2020 (decrease)

05K10K15K20K25K30K35K18801900192019401960198020002020

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 Mason City. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202626,749-1040.39%
202526,853-130.05%
202426,866-590.22%
202326,925+190.07%
202226,906-2781.02%
202127,184-960.35%
202027,280+3351.24%
201926,945-1200.44%
201827,065-2931.07%
201727,358-490.18%

Showing 10 of 31 years.

Mason City Demographics

42.5median age

Median age

Female45.2 yrs
Male41.3 yrs

Adults

21,527
6,215 seniors · 29%15,312 other adults

Sex

Female 51.7% · 13,993Male 48.3% · 13,057

Population by age

MaleFemale85+ years, male: 32785+ years, female: 50380–84 years, male: 30380–84 years, female: 46675–79 years, male: 37175–79 years, female: 62870–74 years, male: 88970–74 years, female: 88665–69 years, male: 83165–69 years, female: 1,01160–64 years, male: 94360–64 years, female: 1,16755–59 years, male: 66255–59 years, female: 75150–54 years, male: 82750–54 years, female: 85145–49 years, male: 69345–49 years, female: 76240–44 years, male: 94540–44 years, female: 65335–39 years, male: 91435–39 years, female: 75730–34 years, male: 71430–34 years, female: 76325–29 years, male: 75525–29 years, female: 92420–24 years, male: 82420–24 years, female: 79315–19 years, male: 85715–19 years, female: 70010–14 years, male: 86710–14 years, female: 9265–9 years, male: 6045–9 years, female: 8110–4 years, male: 7310–4 years, female: 64185+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–45005001K1K

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 271 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

Mason City Income

$64,804median household income

Median household income

$64,804

Half of households earn more, half earn less

Median earnings

$44,132

Typical yearly pay for a worker 25 or older.

Poverty rate

12%

About 1 in 8 residents

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

Mason City Marital Status

51% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married51%52%49%
Never married29%32%26%
Divorced12%12%13%
Widowed7%3%11%
Separated<1%<1%1%

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