Population: Mercer County
Latest value, 2025
399,289persons
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.
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.
Evolution
Value
| Period | Value |
|---|---|
| 2025 | 399,289 |
| 2024 | 397,329 |
| 2023 | 391,369 |
| 2022 | 387,024 |
| 2021 | 382,139 |
| 2020 | 386,434 |
Comparison with related places
| Place | 2025 |
|---|---|
| Mercer County | 399,289 |
| New Jersey | 9,548,215 |
| United States | 341,784,857 |
| Somerset County | 356,486 |
| Burlington County | 481,439 |
| Gloucester County | 312,638 |
| Atlantic County | 278,657 |
| Morris County | 524,251 |
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.Get this figure from your agent
Call get_value through the MCP server or the REST API.
get_value {"indicator":"population","place":"us-county-34021"}
GET https://invokely.ai/api/v1/value?indicator=population&place=us-county-34021