Population & Demographics Since the last census data, Cumberland County has seen an increase in population to approximately 243,764 in 2014, which has taken the county from a fourth class county to a third class county. Cumberland Valley offers a low-cost of living, access to large metropolitan lifestyles, and exceptional educational systems that provide for a highly functioning workforce. CUMBERLAND COUNTY DEMOGRAPHICS Find additional demographic information on our site selection tool. Cumberland County Population Year Population 1990 195,257 2000 213,674 2010 235,406 Change 2000-2010 +10.2% Largest Townships 2010 Census Township Population Hampden Township 28,044 Carlisle Borough (County Seat) 18,682 East Pennsboro Township 18,254 Lower Allen Township 17,437 Silver Spring Township 10,592 Household Income 2010-2014 Households Amount Total Households 95,835 Less than $35,000 26% Between $35,000 & $75,000 34.3% Change 2000-2010 38.8% Median Household Income Year Amount 2000 $46,766 2010 $52,371 Median Age Year Age 2000 38.1 2014 40.7 Age Distribution 2011 Age Group 2000 2011 Under 25 32.6% 30.4% 25-44 28.5% 25.2% 45-64 24.1% 27.4% 65+ 14.8% 17%
