Sign up for and use Google Mapmaker https://mapmaker.google.com/mapmaker

To Add an address:

1. Click Add New and select Add a Place from the drop-down menu.
2. Zoom in and drop the marker at the exact location.
3. Select the category Address from the drop-down menu.
4. Enter the address in the left panel.
5. Click Save to finish.

Following the link above reports that:

Google Map Maker has closed

Google Map Maker officially closed on March 31, 2017, and many of its features are being integrated into Google Maps.