RANKING · 1990 CENSUS · 67 SHOWN OF 67

Youngest by median age, Pennsylvania counties · 1990

Pennsylvania counties with the youngest median age (1990 ACS). This list covers the 67 counties in Pennsylvania that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDLargest foreign-born population Most residents with a disability Largest veteran population Most uninsured people Largest senior population Most unmarried people

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS –

01Centre County, PAPA157,39327.0–

02Indiana County, PAPA82,87831.9–

03Clarion County, PAPA36,68032.3–

04Union County, PAPA42,31332.5–

05Snyder County, PAPA39,65532.6–

06Lancaster County, PAPA563,15932.8–

07Erie County, PAPA265,83233.0–

08Wyoming County, PAPA25,79033.1–

09Philadelphia County, PAPA1,574,28133.4–

10Adams County, PAPA107,59433.5–

11Perry County, PAPA46,80633.5–

12Bucks County, PAPA647,82833.8–

13Chester County, PAPA557,11633.9–

14Butler County, PAPA200,16934.0–

15Columbia County, PAPA66,19334.1–

16Monroe County, PAPA167,17934.1–

17Fulton County, PAPA14,48334.1–

18Tioga County, PAPA40,50234.2–

19Huntingdon County, PAPA43,00134.3–

20York County, PAPA473,19734.5–

21Cumberland County, PAPA277,27034.6–

22Crawford County, PAPA81,79234.6–

23Delaware County, PAPA580,93734.6–

24Juniata County, PAPA23,40334.6–

25Bradford County, PAPA59,60034.6–

26Lycoming County, PAPA112,58734.8–

27Clinton County, PAPA37,87034.8–

28Susquehanna County, PAPA38,23734.9–

29Northampton County, PAPA324,41134.9–

30Dauphin County, PAPA293,35135.0–

31Lebanon County, PAPA146,38035.1–

32Franklin County, PAPA160,65235.1–

33Greene County, PAPA33,88535.2–

34Montour County, PAPA17,86835.2–

35Elk County, PAPA29,92635.4–

36Berks County, PAPA440,07235.5–

37Bedford County, PAPA47,48035.6–

38Clearfield County, PAPA78,10035.6–

39Mifflin County, PAPA46,12735.7–

40Lehigh County, PAPA384,38335.7–

41Potter County, PAPA15,89735.7–

42Jefferson County, PAPA43,25535.8–

43Venango County, PAPA49,34635.8–

44Montgomery County, PAPA877,64335.9–

45Pike County, PAPA62,80835.9–

46McKean County, PAPA38,98435.9–

47Blair County, PAPA119,54136.2–

48Wayne County, PAPA51,70336.3–

49Mercer County, PAPA107,86036.3–

50Somerset County, PAPA72,00436.3–

51Warren County, PAPA37,03836.4–

52Armstrong County, PAPA63,69836.5–

53Allegheny County, PAPA1,225,03536.8–

54Fayette County, PAPA123,02137.0–

55Beaver County, PAPA166,03237.2–

56Lawrence County, PAPA83,91137.3–

57Carbon County, PAPA65,86837.4–

58Cambria County, PAPA128,96837.4–

59Washington County, PAPA210,80237.5–

60Cameron County, PAPA4,21137.6–

61Westmoreland County, PAPA349,32437.7–

62Lackawanna County, PAPA216,50237.8–

63Northumberland County, PAPA89,92037.8–

64Sullivan County, PAPA5,85638.0–

65Luzerne County, PAPA332,12638.2–

66Schuylkill County, PAPA145,08538.6–

67Forest County, PAPA6,61440.8–

SHOWING 1–67 OF 67

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS