Populations in 47 of Pennsylvania's 67 counties have decreased since the 2010 census — including Northumberland, Montour, and Union counties — according to new data released this week by the U.S. Census Bureau.

In the Valley, only Snyder County has seen an increase in population estimates over the past eight years, jumping 2.1%, one of nine counties statewide to increase between 0 and 2.5%. The Census Bureau estimates Snyder County grew from 39,719 to 40,540 — an increase of 821 residents — from April 2010 to July 1, 2018.

According to the Pennsylvania State Data Center, population estimates are based on administrative records including births, deaths and migration. The Census Bureau will release data on municipalities next month. More details data regarding age, sex, race and ethnicity at various levels — nation, state and county — are scheduled to be released in June.

Northumberland County saw the largest decrease, a 3.6% decline from 94,483 to 91,083, according to the data. Both Union and Montour counties' populations remained relatively stagnant. Montour County's population dropped from 18,258 to 18,240 — a loss of just 18 residents — over the eight-year window. Union County's population dropped from 44,963 to 44,785, a 0.4% decrease.

The Pennsylvania State Data Center notes that 13 counties had their population decrease mover than 5%. Cameron County is the fastest declining state, losing 11.7% of its population in eight years. Additionally, 20 counties saw a decrease between 2.6% and 5% and another 14 between 0 and 2.5%. The data center also notes 38 counties declined in population in just the last year.

Only four counties — Cumberland, Lebanon, Centre, and Lehigh — saw their populations rise by more than 5% since 2010. According to the census data, Cumberland County is the state's fastest growing, with a 6.8% increase over eight years.

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