There are a number of resources for airport directories.

Airport Facility Directory

Airport Facility Index

Airport Facility Directory

The Official FAA “Airport/Facility Directory” Digital Directory is Online, while the printed paper book copy is in most pilot shops or web search on “FAA Airport/Facility Directory” to find and buy on line.

Other Resources

AIRNAV.COM

A popular on line Airport Facility directory is AirNav.com which is commonly used by many pilots.

AIRGUIDE PUBLICATIONS FLIGHT GUIDE

The most commonly used book that is carried in most aircraft is the Airguide Publications “Flight Guide” carried in most airplanes.

Airguide Publications Flight Guide