Selecting the right iPhone app development company is crucial for ensuring a high-quality, user-friendly application. Here are some top iPhone app development companies in the USA:

1. IIH Global: Known for its innovative web, software, and mobile app development services, IIH Global delivers reliable and scalable solutions tailored to client needs.
2. Jetruby: A leading mobile & iPhone app development company offering top-notch solutions across diverse industries.
3. Infinum: Specializes in solving complex problems with design and technology, crafting digital products that streamline processes and drive business growth.
4. ELEKS: A trusted partner for guaranteed software engineering excellence, quality, and transparency, helping businesses elevate their value through custom software development.
5. App Makers USA: A full-service mobile application development company specializing in building cross-platform websites and apps, informing your business with innovative solutions.

When choosing a development partner, consider factors such as experience, portfolio, client reviews, and the ability to deliver solutions that align with your business objectives.