This is a listing of Federal Information Processing Standard (FIPS) codes for each of the 67 counties in Pennsylvania.
Information gathered from census data - https://www.census.gov/geo/reference/codes/cou.html
For more technical details :

Federal Information Processing Standards Publications (FIPS PUBS) are issued by the National Institute of Standards and Technology (NIST) after approval by the Secretary of Commerce pursuant to Section 111 (d) of the Federal Property and Administrative Services Act of 1949 as amended by the Computer Security Act of 1987, Public Law 100-235.

Federal Information Processing Standard (FIPS) 6-4, Counties and Equivalent Entities of the U.S., Its Possessions, and Associated Areas -- 90 Aug 31 , provides the names and codes that represent the counties and other entities treated as equivalent legal and/or statistical subdivisions of the 50 States, the District of Columbia, and the possessions and freely associated areas of the United States. Counties are considered to be the "first-order subdivisions" of each State and statistically equivalent entity, regardless of their local designations (county, parish, borough, etc.).

Persons enrolled in Supplemental Nutrition Assistance Program (SNAP) for a given month. SNAP is a federal program administered by the State. This file contains the number of individuals enrolled in SNAP and the dollars spent for a given month. SNAP benefits (dollars) are 100% federally funded.
*Due to the partial federal government shutdown, SNAP participants' February 2019 benefits were issued to EBT cards on or before Jan. 18, 2019

This is a link to the United States Federal Government's Open Data Portal. Here you will find data, tools, and resources to conduct research, develop web and mobile applications, design data visualizations.

Check out the attachment in the metadata detailing all the Opioid Related datasets contained in this portal.

Data.gov is the federal government’s open data site, and aims to make government more open and accountable. Opening government data increases citizen participation in government, creates opportunities for economic development, and informs decision making in both the private and public sectors.

Links included for Center for Disease Control and Prevention both the business website and their Data and Statistics website.