Data / Population / Mercer County

Population in Mercer County

Population in Mercer County was 3,404 in 2025, according to the U.S. Census Bureau. That is down 0.3% from 2024. That is the 114th highest of 115 counties in 2025.

2025, persons3,404
Change on 2024-0.3%
Rank114th of 115Counties in Missouri ranked
Series high3,5162020
Series low3,4042025

Population in Mercer County, 2020 to 2025

CSVChart (SVG)

3,4003,4253,4503,4753,5003,5252020202120222023202420252020: 3,516 persons2021: 3,482 persons2022: 3,471 persons2023: 3,490 persons2024: 3,414 persons2025: 3,404 persons
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-03-26.
All 6 values
Periodpersons
20253,404
20243,414
20233,490
20223,471
20213,482
20203,516

Compared with Missouri and United States

Place2025
Mercer County3,404
Missouri6,270,541
United States341,784,857

Rankings

Definition

Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). United States: Census Bureau population estimates for 1 July. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.

For Denmark, Statistics Denmark counts the registered resident population on 1 January. Greenland and the Faroe Islands are excluded. The annual series selects the first-quarter reference date from FOLK1A. The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.

How to cite

U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-08.

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Questions

What is the population in Mercer County?

Population in Mercer County was 3,404 in 2025, according to the U.S. Census Bureau. That is down 0.3% from 2024. That is the 114th highest of 115 counties in 2025.

Where does this figure come from?

U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). Retrieved by Invokely on 2026-10-08.

What was the highest population in Mercer County?

3,516 in 2020, the highest value since 2020 in this series.

More statistics for Mercer County

All statistics for Mercer County