Data / Population / DeKalb County

Population in DeKalb County

Population in DeKalb County was 9,795 in 2025, according to the U.S. Census Bureau. That is down 0.9% from 2024. That is the 87th highest of 115 counties in 2025.

2025, persons9,795
Change on 2024-0.9%
Rank87th of 115Counties in Missouri ranked
Series high11,7002021
Series low9,7952025

Population in DeKalb County, 2020 to 2025

CSVChart (SVG)

9,50010K10.5K11K11.5K12K2020202120222023202420252020: 11,605 persons2021: 11,700 persons2022: 11,299 persons2023: 9,893 persons2024: 9,882 persons2025: 9,795 persons
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-03-26.
All 6 values
Periodpersons
20259,795
20249,882
20239,893
202211,299
202111,700
202011,605

Compared with Missouri and United States

Place2025
DeKalb County9,795
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 DeKalb County?

Population in DeKalb County was 9,795 in 2025, according to the U.S. Census Bureau. That is down 0.9% from 2024. That is the 87th 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 DeKalb County?

11,700 in 2021, the highest value since 2020 in this series.

More statistics for DeKalb County

All statistics for DeKalb County