Pennsylvania Population 2024 By County. Lehigh county, pennsylvania's estimated 2024 population is 379,234 with a growth rate of 0.39% in the past year according to the most recent united states census data. For the most recent data available, please refer to the vintage 2023 data.
For the most recent data available, please refer to the vintage 2023 data. The site allows data users to search geographies down to the block level and access data through.