• county
  • FIPS 42013
  • Largest town: Altoona

Blair County, Pennsylvania

Blair County had 120,269 residents in the Census Vintage 2024 estimate, on 525.1 square miles of land. It ranks 28th of 67 in Pennsylvania by population and 43rd by land area.

Population
120,269
#28 of 67 in Pennsylvania · #535 in US
Area
525.1 sq mi
#43 of 67 in Pennsylvania · #1,993 in US
Density
229 / sq mi
#24 of 67 in Pennsylvania · #524 in US
Median household income
$54,909
#63 of 67 in Pennsylvania · #2,332 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Blair County within Pennsylvania. Pin: Harrisburg.

Measure from here

Tools and pages that start from Blair County

Blair County population, land area and income

Blair County had 120,269 residents in the Census Vintage 2024 estimate, on 525.1 square miles of land. It ranks 28th of 67 in Pennsylvania by population and 43rd by land area. That works out to 229.1 people per square mile, 2.4 times the US average of 96.3, and in the top quarter nationally.

The median county-equivalent in Pennsylvania has 82,953 residents; Blair County is somewhat larger.

Its SAIPE 2023 median household income of $54,909 is below the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

120,269

3144th1st

535th of 3,144 (US)

Land area

525 sq mi

3144th1st

1993rd of 3,144 (US)

Density

229.1 / sq mi

3144th1st

524th of 3,144 (US)

Median household income

$54,909

3143rd1st

2332nd of 3,143 (US)

Rank within Pennsylvania (67)

Population

120,269

67th1st

28th of 67 (PA)

Land area

525 sq mi

67th1st

43rd of 67 (PA)

Density

229.1 / sq mi

67th1st

24th of 67 (PA)

Median household income

$54,909

67th1st

63rd of 67 (PA)

How Blair County's population changed since 2020

Blair County lost 2,395 residents between the July 2020 and July 2024 estimates, a drop of 2.0%. That ranks 51st of 67 in Pennsylvania for growth. The median Pennsylvania county changed by -0.5%, and the state as a whole by +0.6%.

Since the April 2020 estimates base, Blair County recorded 4,971 births and 7,635 deaths, a natural change of -2,664. Net international migration added +505 and net domestic migration, people moving to or from other US counties, came to -468. The largest single component was natural change, which removed 2,664 people.

122.7k2020122.2k2021120.8k2022120.5k2023120.3k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
4,971
Deaths
7,635
Net international migration
+505
Net domestic migration
-468
Change, July 2023 to July 2024
-225

Where Blair County is

The Census internal point of Blair County is at 40.498700, -78.309600. It sits in UTM zone 17N. The map shades Pennsylvania's 67 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Blair County outlined. Dots are towns of 1,000+ people with residents in it.

Adams County: +4.0%Potter County: -2.4%Sullivan County: +1.6%Bucks County: +0.6%Carbon County: +1.5%McKean County: -2.3%Montour County: -0.1%Fulton County: -0.9%Columbia County: +2.0%Cameron County: -4.1%Elk County: -2.6%Bradford County: -0.4%Bedford County: +0.1%York County: +3.2%Monroe County: -1.1%Forest County: -5.2%Berks County: +2.4%Cambria County: -2.3%Franklin County: +2.1%Snyder County: -0.3%Somerset County: -2.5%Clarion County: -0.9%Indiana County: -0.2%Lackawanna County: +0.6%Wyoming County: -1.0%Lawrence County: -2.0%Mercer County: -2.2%Lehigh County: +3.0%Northampton County: +3.3%Cumberland County: +5.9%Fayette County: -3.6%Jefferson County: -2.5%Centre County: +1.2%Lebanon County: +1.4%Union County: -1.2%Clinton County: +1.3%Chester County: +4.8%Montgomery County: +2.6%Wayne County: +0.5%Pike County: +6.5%Susquehanna County: -0.6%Allegheny County: -1.4%Clearfield County: -2.9%Butler County: +2.7%Beaver County: -1.4%Crawford County: -2.1%Washington County: +0.5%Venango County: -1.7%Warren County: -3.0%Blair County: -2.0%Huntingdon County: -1.6%Lancaster County: +1.9%Luzerne County: +1.9%Westmoreland County: -1.0%Juniata County: -0.4%Armstrong County: -2.7%Tioga County: -0.8%Delaware County: +1.4%Northumberland County: -1.7%Mifflin County: -0.5%Lycoming County: -0.8%Perry County: +2.1%Philadelphia County: -1.7%Schuylkill County: +1.1%Dauphin County: +2.2%Greene County: -5.3%Erie County: -1.1%
Change 2020 to 2024
  1. < -2.2%
  2. < -1.0%
  3. < +0.1%
  4. < +1.9%
  5. ≥ +1.9%
no data

Orange pin: Blair County internal point. Dark pin: Harrisburg.

Internal point

Decimal
40.498700, -78.309600
DMS
40°29'55.32"N 78°18'34.56"W
UTM
17N 727985.6E 4486588.0N
Geohash
dr0q6h8dn
Plus code
87G3FMXR+F5

Towns in Blair County

8 incorporated places of 1,000+ people have residents in Blair County, 61,872 people together, or 51% of the county. Each figure counts only the part of the town inside Blair County; towns marked "part" extend into another county. The largest is Altoona with 42,719.

  1. 01Altoona42,719
  2. 02Hollidaysburg5,537
  3. 03Tyrone5,312
  4. 04Roaring Spring2,297
  5. 05Martinsburg1,823
  6. 06Bellwood1,764
  7. 07Duncansville1,217
  8. 08Williamsburg1,203
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Blair County

The Census 2024 county adjacency file lists 5 neighbors for Blair County. The most populous is Centre County, PA, with 159,805 residents. Distances run between Census internal points in a straight line.

Distance to Harrisburg and the nearest big city

Harrisburg is 76.8 miles ESE of Blair County's internal point in a straight line. The nearest place of 100,000 or more is Pittsburgh, PA (population 307,668), 87.7 miles away. The nearest place of 10,000 or more is Altoona, PA (population 42,719), 4.8 miles away.

Blair County FIPS code

The FIPS code of Blair County is 42013: state code 42 for Pennsylvania plus county code 013. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $54,909.

Questions people ask

What is the population of Blair County, Pennsylvania?

The Census Vintage 2024 estimate for July 1, 2024 is 120,269. That is down 2,395 people (2.0%) from the July 2020 estimate of 122,664.

What is the FIPS code of Blair County?

42013. The first two digits (42) are Pennsylvania; the last three (013) identify the county.

What is the largest town in Blair County?

Altoona, with 42,719 residents inside Blair County in 2024.

Which counties border Blair County?

5 county-equivalents border it in the Census 2024 adjacency file: Centre County, PA; Cambria County, PA; Clearfield County, PA; Bedford County, PA; Huntingdon County, PA.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.