Lehigh County, Pennsylvania Population
Current Population
384,383
Estimated July 1, 2025
+9,934 residents(+2.7%)since 2020
Latest Official Census
374,557
2020 Census
Population Over Time
Estimated population changed from 374,449 in 2020 to 384,383 in 2025.
| Year | Population | Change | % change |
|---|---|---|---|
| 2020 | 374,449 | — | — |
| 2021 | 375,852 | +1,403 | +0.4% |
| 2022 | 376,746 | +894 | +0.2% |
| 2023 | 380,068 | +3,322 | +0.9% |
| 2024 | 382,939 | +2,871 | +0.8% |
| 2025 | 384,383 | +1,444 | +0.4% |
2020 Census (official count): 374,557
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 — 384,383 · July 1, 2025
U.S. Census Bureau — County Resident Population Estimates (CO-EST2025-ALLDATA), Vintage 2025
Official Census — 374,557 · 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: 374,449 on July 1, 2020 and 384,383 on July 1, 2025. The change is the later estimate minus the earlier one (+9,934), and the percentage is that change divided by the 2020 estimate (+2.7%). 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 Lehigh County
10 incorporated places
- FIPS code
- 42077
- Classification
- county