Northampton County, Pennsylvania Population (2025)

Current Population

324,411

Estimated July 1, 2025

+11,602 residents(+3.7%)since 2020

Latest Official Census

312,951

2020 Census

Population Over Time

Estimated population changed from 312,809 in 2020 to 324,411 in 2025.

Annual population estimates by year.
Year	Population	Change	% change
2020	312,809	—	—
2021	318,234	+5,425	+1.7%
2022	318,123	-111	0%
2023	320,993	+2,870	+0.9%
2024	323,085	+2,092	+0.7%
2025	324,411	+1,326	+0.4%

2020 Census (official count): 312,951

Sources & Methodology

The current population figure is an annual estimate from the U.S. Census Bureau's Population Estimates Program. The 2020 Census is shown separately as the official benchmark.

Current estimate — 324,411 · July 1, 2025

U.S. Census Bureau — County Resident Population Estimates (CO-EST2025-ALLDATA), Vintage 2025

Official Census — 312,951 · April 1, 2020

U.S. Census Bureau — 2020 Census Redistricting Data (P.L. 94-171), table P1 — county totals (SUMLEV 050)

These figures can differ because the Census and annual population estimates are produced at different times using different methods. Both are shown so you can distinguish the most current estimate from the official Census benchmark.

How the change since 2020 is calculated

Both endpoints come from the same Census Bureau Population Estimates Program release, so the comparison is like for like: 312,809 on July 1, 2020 and 324,411 on July 1, 2025. The change is the later estimate minus the earlier one (+11,602), and the percentage is that change divided by the 2020 estimate (+3.7%). The Decennial Census count is never used as an endpoint here — it is an enumeration on a different reference date, produced by a different method, so subtracting one from the other would measure the difference between two methods as well as the change in population.

U.S. Census Bureau — County Resident Population Estimates (CO-EST2025-ALLDATA), Vintage 2025

Incorporated places in Northampton County

21 incorporated places