• county
  • FIPS 42077
  • Largest town: Allentown

Lehigh County, Pennsylvania

Lehigh County had 385,655 residents in the Census Vintage 2024 estimate, on 345.3 square miles of land. It ranks 10th of 67 in Pennsylvania by population and 62nd by land area.

Population
385,655
#10 of 67 in Pennsylvania · #199 in US
Area
345.3 sq mi
#62 of 67 in Pennsylvania · #2,691 in US
Density
1,117 / sq mi
#5 of 67 in Pennsylvania · #144 in US
Median household income
$76,270
#15 of 67 in Pennsylvania · #615 in US

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

Lehigh County within Pennsylvania. Pin: Harrisburg.

Measure from here

Tools and pages that start from Lehigh County

Lehigh County population, land area and income

Lehigh County had 385,655 residents in the Census Vintage 2024 estimate, on 345.3 square miles of land. It ranks 10th of 67 in Pennsylvania by population and 62nd by land area. That works out to 1,116.7 people per square mile, 11.6 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in Pennsylvania has 82,953 residents, so Lehigh County is 4.6 times that size.

Its SAIPE 2023 median household income of $76,270 is in the top quarter among 3,143 counties with an estimate.

National rank among 3,144

Population

385,655

3144th1st

199th of 3,144 (US)

Land area

345 sq mi

3144th1st

2691st of 3,144 (US)

Density

1,116.7 / sq mi

3144th1st

144th of 3,144 (US)

Median household income

$76,270

3143rd1st

615th of 3,143 (US)

Rank within Pennsylvania (67)

Population

385,655

67th1st

10th of 67 (PA)

Land area

345 sq mi

67th1st

62nd of 67 (PA)

Density

1,116.7 / sq mi

67th1st

5th of 67 (PA)

Median household income

$76,270

67th1st

15th of 67 (PA)

How Lehigh County's population changed since 2020

Lehigh County gained 11,162 residents between the July 2020 and July 2024 estimates, a rise of 3.0%. That ranks 7th 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, Lehigh County recorded 16,548 births and 16,055 deaths, a natural change of +493. Net international migration added +12,593 and net domestic migration, people moving to or from other US counties, came to -2,192. The largest single component was international migration, which added 12,593 people.

374.5k2020375.9k2021377.0k2022380.9k2023385.7k2024
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
16,548
Deaths
16,055
Net international migration
+12,593
Net domestic migration
-2,192
Change, July 2023 to July 2024
+4,783

Where Lehigh County is

The Census internal point of Lehigh County is at 40.614200, -75.590600. It sits in UTM zone 18N. The map shades Pennsylvania's 67 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Lehigh 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: Lehigh County internal point. Dark pin: Harrisburg.

Internal point

Decimal
40.614200, -75.590600
DMS
40°36'51.12"N 75°35'26.16"W
UTM
18N 450041.0E 4496098.7N
Geohash
dr4ppcsdg
Plus code
87G6JC75+MQ

Towns in Lehigh County

10 incorporated places of 1,000+ people have residents in Lehigh County, 187,721 people together, or 49% of the county. Each figure counts only the part of the town inside Lehigh County; towns marked "part" extend into another county. The largest is Allentown with 127,138.

  1. 01Allentown127,138
  2. 02Bethlehem (part)20,384
  3. 03Emmaus12,314
  4. 04Catasauqua6,625
  5. 05Fountain Hill4,880
  6. 06Slatington4,331
  7. 07Coplay3,555
  8. 08Macungie3,335
  9. 09Alburtis2,625
  10. 10Coopersburg2,534
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Lehigh County

The Census 2024 county adjacency file lists 6 neighbors for Lehigh County. The most populous is Montgomery County, PA, with 879,190 residents. Distances run between Census internal points in a straight line.

Distance to Harrisburg and the nearest big city

Harrisburg is 72.2 miles WSW of Lehigh County's internal point in a straight line. The nearest place of 100,000 or more is Allentown, PA (population 127,138), 6.0 miles away.

Lehigh County FIPS code

The FIPS code of Lehigh County is 42077: state code 42 for Pennsylvania plus county code 077. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $76,270.

Questions people ask

What is the population of Lehigh County, Pennsylvania?

The Census Vintage 2024 estimate for July 1, 2024 is 385,655. That is up 11,162 people (3.0%) from the July 2020 estimate of 374,493.

What is the FIPS code of Lehigh County?

42077. The first two digits (42) are Pennsylvania; the last three (077) identify the county.

What is the largest town in Lehigh County?

Allentown, with 127,138 residents inside Lehigh County in 2024.

Which counties border Lehigh County?

6 county-equivalents border it in the Census 2024 adjacency file: Montgomery County, PA; Bucks County, PA; Berks County, PA; Northampton County, PA; Schuylkill County, PA; Carbon 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.