How many people live in Montgomery County, PA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 879,200 people living in Montgomery County, PA. That makes Montgomery County the third-most populous county in Pennsylvania. It is home to 6.7% of people living in the state.
879K
population of Montgomery County, PA (2024)
6.7%
County share of the Pennsylvania population (2024)
About 879,200 people lived in Montgomery County, PA in 2024.
Population estimates, 2000–2024
What are Montgomery County, PA’s age demographics?
About 173,900 Montgomery County, PA residents are aged 65 and older in 2024. That represents 19.8% of its population. For comparison, the age group represents 20.4% of Pennsylvania’s population and 18% in the US overall.
Another 183,300 Montgomery County residents, or 20.9% of the population, were children under 18. For comparison, the age group represents 20.1% of Pennsylvania’s population and 21.6% in the US overall.
A higher share of Montgomery County, PA's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Montgomery County, PA’s racial and ethnic demographics?
Non-Hispanic white residents make up 71.6% of the Montgomery County, PA population, higher than the national share of 57.5%. Montgomery County, PA also has a larger share of people identifying as non-Hispanic Asian (9%) than the US overall (6.5%).
In contrast, Montgomery County’s Hispanic population accounts for 7.1%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 9.8% of the county, compared with 12.6% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Montgomery County, PA has a higher share of a non-Hispanic Asian population than Pennsylvania as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Montgomery County, PA is Lower Merion with about 64,700 residents in 2024.
Cities and towns in Montgomery County, PA ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Lower Merion | 64,702 |
| 2. | Abington | 59,075 |
| 3. | Cheltenham | 38,840 |
| 4. | Upper Merion | 36,414 |
| 5. | Norristown borough | 36,075 |
| 6. | Horsham | 27,735 |
| 7. | Upper Dublin | 27,489 |
| 8. | Montgomery | 26,280 |
| 9. | Upper Moreland | 26,253 |
| 10. | Lower Providence | 26,136 |
Keep exploring
Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
