Northumberland County, Pennsylvania

Northumberland County population, land area and income

Northumberland County had 90,027 residents in the Census Vintage 2024 estimate, on 457.7 square miles of land. It ranks 32nd of 67 in Pennsylvania by population and 49th by land area. That works out to 196.7 people per square mile, 2.0 times the US average of 96.3, and in the top quarter nationally.

The median county-equivalent in Pennsylvania has 82,953 residents, about the same as Northumberland County.

Its SAIPE 2023 median household income of $58,834 is below the national county median among 3,143 counties with an estimate.

How Northumberland County's population changed since 2020

Northumberland County lost 1,523 residents between the July 2020 and July 2024 estimates, a drop of 1.7%. That ranks 48th 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, Northumberland County recorded 3,490 births and 5,388 deaths, a natural change of -1,898. Net international migration added +276 and net domestic migration, people moving to or from other US counties, came to -41. The largest single component was natural change, which removed 1,898 people.

Where Northumberland County is

The Census internal point of Northumberland County is at 40.851500, -76.709900. 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 Northumberland County outlined. Dots are towns of 1,000+ people with residents in it.

Towns in Northumberland County

8 incorporated places of 1,000+ people have residents in Northumberland County, 39,188 people together, or 44% of the county. Each figure counts only the part of the town inside Northumberland County; towns marked "part" extend into another county. The largest is Sunbury with 9,549.

Counties bordering Northumberland County

The Census 2024 county adjacency file lists 9 neighbors for Northumberland County. The most populous is Dauphin County, PA, with 293,029 residents. Distances run between Census internal points in a straight line.

• Dauphin County

  293,029 people

  31 mi S

• Schuylkill County

  144,523 people

  28 mi ESE

• Lycoming County

  113,236 people

  38 mi NNW

• Columbia County

  66,012 people

  21 mi NE

• Perry County

  46,816 people

  43 mi SW

• Union County

  42,159 people

  20 mi WNW

• Snyder County

  39,627 people

  20 mi WSW

• Juniata County

  23,395 people

  42 mi WSW

• Montour County

  18,115 people

  13 mi N

Distance to Harrisburg and the nearest big city

Harrisburg is 41.6 miles SSW of Northumberland County's internal point in a straight line. The nearest place of 100,000 or more is Allentown, PA (population 127,138), 66.9 miles away. The nearest place of 10,000 or more is Bloomsburg, PA (population 13,286), 16.8 miles away.

Northumberland County FIPS code

The FIPS code of Northumberland County is 42097: state code 42 for Pennsylvania plus county code 097. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $58,834.