Fairfield Population

1900–2026

44,657

2026 projection

0.6% since 2020 (decrease)

010K20K30K40K50K1900192019401960198020002020

Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal 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 Fairfield. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202644,657-250.06%
202544,682-1160.26%
202444,798+1490.33%
202344,649+1810.41%
202244,468-1220.27%
202144,590-3170.71%
202044,907+1770.40%
201944,730+2140.48%
201844,516+2340.53%
201744,282+1770.40%

Showing 10 of 24 years.

The 2020 row compares the April 1 Census count with the July 1, 2019 estimate (about nine months). Its Growth and Annual change therefore do not represent a full year.

Growth since 2020, compared

Fairfield has a population change lower than Butler County, Ohio, and the U.S.

  • United States+3.1%
  • Butler County+2.4%
  • Ohio+0.9%
  • Fairfield−0.5%

Change from July 1, 2020 to July 1, 2025 population estimates—not annualized growth or site projections.

Source: U.S. Census Bureau. U.S. totals are summed from the 50 states and D.C.; unavailable comparisons are omitted.

Fairfield Demographics

38.1median age

Median age

Female40.2 yrs
Male36.6 yrs

Adults

35,407
7,886 seniors (65+) · 22% of adults27,521 other adults

Sex

Female 50.4% · 22,607Male 49.6% · 22,221

Population by age

MaleFemale85+ years, male: 35985+ years, female: 73380–84 years, male: 35080–84 years, female: 34775–79 years, male: 59975–79 years, female: 92770–74 years, male: 84070–74 years, female: 1,08765–69 years, male: 1,30165–69 years, female: 1,34360–64 years, male: 1,46160–64 years, female: 1,49955–59 years, male: 1,47655–59 years, female: 1,33250–54 years, male: 1,62550–54 years, female: 1,46645–49 years, male: 1,12945–49 years, female: 1,23640–44 years, male: 96840–44 years, female: 1,39335–39 years, male: 1,45335–39 years, female: 1,19930–34 years, male: 1,62430–34 years, female: 1,59925–29 years, male: 1,92125–29 years, female: 1,75420–24 years, male: 1,61620–24 years, female: 1,62815–19 years, male: 1,33415–19 years, female: 1,58610–14 years, male: 1,16710–14 years, female: 1,2465–9 years, male: 1,6285–9 years, female: 1,1670–4 years, male: 1,3700–4 years, female: 1,06585+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–45005001K1K1.5K1.5K

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 448 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

Fairfield Income

$77,937median household income

Median household income

$77,937

Half of households earn more, half earn less

Median earnings

$50,597

Typical yearly pay for a worker 25 or older.

Poverty rate

8.4%

About 1 in 12 residents

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

Fairfield Marital Status

47% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married47%48%46%
Never married34%38%31%
Divorced11%9%12%
Widowed7%4%10%
Separated1%1%2%

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

Sources

14 sources

Population

American Community Survey, 2024 5-year

Additional sources