From the About page for ACT | The App Association:

"The App Association represents more than 5,000 app makers and connected device companies in the mobile economy, a $950 billion ecosystem led by U.S. companies. Organization members leverage the connectivity of smart devices to create innovative solutions that make our lives better. The App Association is the leading industry resource on market strategy, regulated industries, privacy, and security.

App Association members are located across the United States – in all 435 congressional districts – and around the globe, showing that with coding skills and an internet connection, an app maker can succeed from anywhere. Because of low barriers to entry, the app marketplace has seen high growth in areas which have not been traditional tech hubs. In the United States, more than 83 percent of app companies."