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Mercer County, PA Demographics

Mercer County, PA is the 30th most populous of 67 counties in Pennsylvania, with 110,652 residents across 673 square miles. That is about 165 people per square mile.

At the 2020 census

Population 110,652
Land area 673 sq mi
Density 165 / sq mi

Data: 2020 Census · American Community Survey 2024

How Mercer County compares to the US

We're computing this county's comparison table — check back shortly. Population, land area, and density above are already exact.

Central Location: Mercer County, PA

Measured from the county's main population center using 2020 census blocks.

We're computing the drive-time and radius areas around Mercer County, PA — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.

Census tracts in Mercer County, PA

Name Population Sq mi Per sq mi
Census Tract 326.01 5,741 64.8 89
Census Tract 312 5,487 11.6 472
Census Tract 314 5,472 3.5 1,566
Census Tract 320 4,850 59.5 81
Census Tract 326.02 4,779 22.4 214
Census Tract 318 4,729 94.4 50
Census Tract 330 4,728 1.4 3,266
Census Tract 319 4,682 26.5 176
Census Tract 331 4,678 55.2 85
Census Tract 327.01 4,340 30.8 141
Census Tract 328.01 3,519 34.4 102
Census Tract 323 3,229 22.6 143
Census Tract 329 3,191 1.3 2,463
Census Tract 303 3,182 0.7 4,370
Census Tract 332 2,945 1.3 2,330
Census Tract 333 2,881 2.4 1,183
Census Tract 325.04 2,796 28.0 100
Census Tract 322 2,788 0.8 3,514
Census Tract 321 2,736 1.1 2,502
Census Tract 304 2,701 0.8 3,274
Census Tract 313 2,618 8.7 300
Census Tract 309 2,562 1.0 2,580
Census Tract 324.03 2,520 33.0 76
Census Tract 317 2,476 0.7 3,511
Census Tract 327.02 2,471 20.9 118
Census Tract 305 2,385 0.5 5,015
Census Tract 334 2,300 2.2 1,057
Census Tract 325.02 2,199 43.3 51
Census Tract 328.02 1,957 7.9 249
Census Tract 301 1,934 0.5 4,036
Census Tract 325.03 1,652 34.9 47
Census Tract 324.02 1,641 2.6 626
Census Tract 311 1,532 3.8 400
Census Tract 324.01 1,477 13.5 109
Census Tract 325.05 1,458 35.2 41

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About this page

This page shows demographics for a US county from the 2020 census and the American Community Survey: population, land area, density, urban share, and how the county compares to national averages for income, housing, age, and more.

Counties subdivide into census tracts, listed below with their populations. The drive-time and radius tables measure the population around the county's main population center.

Read how BlockAtlas computes population within an area →