What is the largest city in Union County, PA?

Lewisburg is the largest city or town in Union County, with about 5,257 residents.

How many ZIP codes are in Union County?

Union County includes 12 ZIP Code Tabulation Areas, including 17829, 17835, 17837, 17844, 17845.

What is the population of Union County, PA?

About 42,456 people live in Union County, based on American Community Survey 5-year estimates.

What counties border Union County?

Union County borders Centre County, Lycoming County, Northumberland County, Mifflin County, Snyder County, Clinton County.

Union County, PA: Cities, ZIP Codes & Local Data

Population

42,456

Land area

316sq mi

People per sq mi

134

ZIP codes

12

Union County at a glance

Union County is 54% less dense than Pennsylvania as a whole.
The median household income is $76,404, close to the Pennsylvania median.
A typical owner-occupied home is valued at $240,100 (6% below Pennsylvania) and median rent is $974 a month.
The biggest population centers are Lewisburg (5,257), Mifflinburg (3,473) and Linntown (1,764).

Local data for Union County, PA

Counts from official public data

Housing and community stats

Union County, PA, American Community Survey 2020-2024

Full profile

Median household income

$76,404

Poverty rate

9.0%

Median home value

$240,100

Prices +11.5% in a year

Median rent

$974/mo

Homeownership

72.3%

Bachelor's or higher

26.5%

Median age

41.0

Average commute

17.9 min

Largest reported origins and ancestries: German Americans (12,675), Irish Americans (2,945), Italian Americans (2,127).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

2.9%

Sep 2026, -1.1 pts in a year

Average annual pay

$61,062

17,328 jobs, 2025

Income per person

$55,791

BEA, 2024

Federal spending

$256M

FY 2026, $5,993 per person

PPP loans

$76.3M

913 loans, 9,371 jobs reported

Campaign donations

$157K

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

Union County, PA, workers 16 and older. American Community Survey 5-year estimates

Drove alone69.6%
Carpooled7.0%
Public transit0.2%
Walked11.4%
Bicycle1.8%
Taxi, ride-hailing, motorcycle or other1.0%
Worked from home9.0%

Average one-way commute: 17.9 minutes for people who do not work from home.

Environment and hazard risk

Union County, PA, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Low

Top: strong wind

Storm events since 1996

265

Most often thunderstorm wind

Flood insurance policies

231

2.0% of homes, county

July high / Jan low

84° / 19°F

43.9 inches of rain a year

Hazards, floods and storm history Check a flood zone 13 historic places

Cities, towns and ZIP codes in Union County

Population shown

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Frequently asked questions

What is the largest city in Union County, PA?: Lewisburg is the largest city or town in Union County, with about 5,257 residents.
How many ZIP codes are in Union County?: Union County includes 12 ZIP Code Tabulation Areas, including 17829, 17835, 17837, 17844, 17845.
What is the population of Union County, PA?: About 42,456 people live in Union County, based on American Community Survey 5-year estimates.
What counties border Union County?: Union County borders Centre County, Lycoming County, Northumberland County, Mifflin County, Snyder County, Clinton County.