Quite old 2012's article states that "Combining satellite, aerial and street level imagery, Google Maps has over 20 petabytes of data, which is equal to approximately 21 million gigabytes, or around 20,500 terabytes."
Another reported estimate for the total size of the Google Earth and Maps database is 3,017 TB or approximately 3 Petabytes not including Street view imagery.
Here are estimates for the Google Maps and Google Earth database by type of data:
Source: http://www.gearthblog.com/blog/archives/2016/04/big-google-earth-database.html
From reports in 2006, the Google Earth and Google Maps data servers have 70.5 TB for both its map imagery and index data, and Personalized Search uses 4 TB.
.........
"Total area of the planet: 510.3 million km2
Area of land emerged: 149.67 million km2 (29.31%)
Area of the seas and oceans: 360.63 million km2 (70.69%)
One image at 363 meters high resolution the GE use 300kb, average.
For entire Earth 1,579 Terabytes
Just Emerged Land 468 Terabytes"
And that's just for the birds eye view.
I don't know how the imaging for streets works (for 360 degree views and all)
But i'm guessing its a lot bigger than the birds eye view.
So, maybe something like in the 10s of thousands of terabytes.
Anyway it's pretty big.
70TB for Raw Imagery and 500GB for index data.
google, bing, yahoo, you tube, wikipedia, google maps, google images.
There are no towns in the US (or in the world) in the Google Maps database.
When Google updates it street view photos in its image database then these updates are made available to Google Maps and Google Earth.
Google Maps doesn't display the imagery dates, but Google Earth does. That's Google Earth the desktop application not the 'Earth' mode found in Google Maps. Since both use the same imagery database you only need to visit the same area in Google Earth and enable the 'Status Bar' in View menu to show the approximate imagery date in lower-left corner of the screen.
Google Maps provides satellite and map views in addition to Street Views. The satellite view of Google Maps uses the same backend satellite imagery database used by Google Earth.The satellite imagery are typically from the GeoEye or DigitalGlobe owned satellites, and some of the imagery are actually aerial photos from aircraft using special high resolution cameras.
Google Inc. Usually updates its digital maps yearly, including Google Earth and Google Maps.
From reports in 2006, the Google Earth and Google Maps data servers have 70.5 TB for both its map imagery and index data, and Personalized Search uses 4 TB. The data breakdown has not been published by Google.
In 2006 Google Maps was updated to use the same satellite image database as Google Earth. Before that Google had to update and process imagery for both Google Earth and Google Maps where the maps where often out of sync with each other. Now Google updates its central map & imagery database and the updates are made available to both Google Earth and Google Maps at once. The time between getting imagery from satellite and seeing it on Google Maps is far from real-time. Once the imagery is taken by satellite, it takes time to process the data by a commercial provider like GeoEye before it is available to Google and other customers. Google will do additional processing to convert imagery into the format and coordinate system of its internal databases. This is one reason you normally won't find any imagery younger than about 6 months. For these reasons, the Google map & imagery database is updated once or twice a month.
One can only download Google Maps if their GPS is an "Android" i.e. a GPS bought from Google. If you have one of these then you can download Google Maps straight from "Google Mobile Maps".
Google clearly spells out what you can and cannot do with their products including Google Maps. Since maps and imagery change all the time, Google prefers websites link to an interactive Google Maps via the Google Maps API but there are instances where screenshots to Google Maps imagery is allowed given the rules are followed. For details check out the Google Maps and Google Earth permissions tool.
Search for Google on Google Maps; it's in Mountain View, California.
Once you disable Google maps, you will lose the maps function