Apple started allowing local businesses to add or manage their listing in Apple Maps back in October of last year, but this had to be done through the Maps Connect web service. As of today, it can be done directly through the Apple Maps app on an iOS device running the latest iOS 8.3.
To claim your business, search for it in the app, tap the Info icon, select Report a problem and then select Claim this business at the bottom of the screen.
Businesses in selected other countries can still claim their business through Maps Connect, which was expanded from the US to Australia, New Zealand, Ireland, Singapore and the UK in January; to Canada, France and Germany in February; and to Italy, Switzerland and Mexico in March.
FTC: We use income earning auto affiliate links. More.