New data from the U.S. Bureau, showing population changes for counties from 2010 to 2015, shows Allegany County’s population is down by 1,484 residents in those five years, a 3 percent decline. Allegany County's population was 48,946 in 2010 but dropped to 47,462 by 2015. From just 2014 to 2015, the population dipped by several hundred.
The Census data shows that only 19 counties out of 62 added population since 2010. In Western New York, seven of the eight counties went down, except for Erie County, which added 3,514 people.
Steuben County also say a 3 percent population decline for the first half of the decade. Cattaraugus County's population dripped 3 percent to 77,922 in 2015. Wyoming County's population dropped to 41,013, a 2.7 percent decline. Potter County, Pennsylvania also lost population, dropping 2.1 percent to 17,093.